Heat transfer studies were carried out in a laboratory scale gas-solid fluidized bed with 0.1m
ID x 1 m length column, using three sizes of local sand particles of 301, 454, and 560 µm. the bed
region was heated bya horizontal heat transfer probe. It was made of copper rod (15 mm ODx50 mm
long) and insulated at the ends by Teflon. A hole was drilled at the center of the rod to accommodate
a cartridge heater 200 W (6.5 mm OD x 42 mm long). Three bed inventories of sand 1.5 kg, 2.0 kg,
and 2.5 kg, four superficial air velocities of 1.0 m/s, 1.25 m/s, 1.5 m/s, 1.75 m/s were used. Three
heat fluxes of 1698.9, 2928.4, 4675.7 W m-2 were employed. The data obtained showed how the heat
transfer coefficient effected by the above operating parameters. The heat transfer coefficient is
directly proportional with air superficial velocity as well as the bed inventory and heat fluxes but
inversely proportional with sand particles size.
Experimental Investigation of a Dimpled Plate by Natural Convection Heat Tran...IRJET Journal
This document summarizes previous research on using dimpled surfaces to enhance heat transfer via natural convection. It begins by defining natural convection and explaining how dimpled surfaces promote turbulence and vortex formation, augmenting heat transfer. The document then reviews several studies that experimentally investigated heat transfer over dimpled plates and tubes. Most found that heat transfer increased with dimple density, depth, and Reynolds number. The objectives of the proposed new study are to analyze heat transfer from vertically heated dimpled plates with variations in dimple shape, size, and arrangement. It is hypothesized that dimpled plates will enhance thermal performance over smooth plates through increased surface area and reduced flow separation.
article motion near the wall of a fluidized bed at elevated pressureIgor Sidorenko
1. The document studies the effect of operating pressure on particle motion near the wall in a fluidized bed. Luminescent pigment was used to illuminate particle clusters and their movement was analyzed using digital imaging.
2. Preliminary experiments showed particle residence time at the wall decreases with increasing fluidization velocity. Further experiments analyzed particle motion at similar fluidization velocities but varying operating pressure.
3. The results indicate operating pressure has some influence on particle motion for Geldart A particles near the wall, with higher pressures resulting in faster particle exchange and shorter residence times, as seen through the decay and shifting of illuminated particle clusters along the wall over time.
Magnetic field effect on mixed convection flow in a nanofluid under convectiv...IAEME Publication
An analysis is carried out to investigate the influence of the prominent magnetic effect on mixed convection heat and mass transfer in the boundary layer region of a semi-infinite vertical flat plate in a nanofluid under the convective boundary conditions. The transformed boundary layer,ordinary differential equations are solved numerically using Runge-Kutta Fourth order method.
The results show that, with proper selection of physical parameters, significant heat transfer
enhancements and pressure drop reductions can be achieved simultaneously with porous pin fins and
the overall heat transfer performances in porous pin fin channels are much better than those in
traditional solid pin fin channels. The effects of pore density are significant. As PPI increases, the
pressure drops and heat fluxes in porous pin fin channels increase while the overall heat transfer
efficiencies decrease and the maximal overall heat transfer efficiencies are obtained at PPI 20.
Furthermore, the effects of pin fin form are also remarkable. With the same physical parameters, the
overall heat transfer efficiencies in the long elliptic porous pin fin channels are the highest while they
are the lowest in the short elliptic porous pin fin channels
Investigation of the Effect of Nanoparticles Mean Diameter on Turbulent Mixed...A Behzadmehr
Abstract
Turbulent mixed convection of a nanofluid (water/Al2O3, Φ=.02) has been studied numerically. Two-phase
mixture model has been used to investigate the effects of nanoparticles mean diameter on the flow parameters. Nanoparticles distribution at the tube cross section shows that the particles are uniformly dispersed. The non-uniformity of the particles distribution occurs in the case of large nanoparticles and/or high value of the Grashof numbers. The study of particle size effect showed that the effective Nusselt number and turbulent intensity increases with the decreased of particle size.
Effect of Radiation on Mixed Convection Flow of a Non-Newtonian Nan fluid ove...IJMER
International Journal of Modern Engineering Research (IJMER) is Peer reviewed, online Journal. It serves as an international archival forum of scholarly research related to engineering and science education.
Study on Thermal and Hydrodynamic Indexes of a Nanofluid Flow in a Micro Heat...A Behzadmehr
The paper numerically presents laminar forced convection of a nanofluid flowing in a duct at microscale.
Results were compared with both analytical and experimental data and observed good concordance with
previous studies available in the literature. Influences of Brinkman and Reynolds number on thermal and
hydrodynamic indexes have been investigated. For a given nanofluid, no change in efficiency (heat dissipation
to pumping power) was observed with an increasing in Reynolds number. It was shown that the pressure was
decrease with an increase in Brinkman number. Dependency of Nu increment changes with substrate material.
Boundary layer flow and heat transfer of a dusty fluid over a vertical permea...eSAT Journals
This document discusses boundary layer flow and heat transfer of a dusty fluid over a vertical permeable stretching surface. The governing equations for steady, two-dimensional flow are presented and non-dimensionalized. The equations are then solved numerically using the Runge-Kutta method. Results are presented graphically showing the effects of various parameters like fluid-particle interaction, local Grashof number, radiation parameter, and Eckert number on flow and heat transfer characteristics. Comparisons are made to previous studies to validate the numerical method.
Experimental Investigation of a Dimpled Plate by Natural Convection Heat Tran...IRJET Journal
This document summarizes previous research on using dimpled surfaces to enhance heat transfer via natural convection. It begins by defining natural convection and explaining how dimpled surfaces promote turbulence and vortex formation, augmenting heat transfer. The document then reviews several studies that experimentally investigated heat transfer over dimpled plates and tubes. Most found that heat transfer increased with dimple density, depth, and Reynolds number. The objectives of the proposed new study are to analyze heat transfer from vertically heated dimpled plates with variations in dimple shape, size, and arrangement. It is hypothesized that dimpled plates will enhance thermal performance over smooth plates through increased surface area and reduced flow separation.
article motion near the wall of a fluidized bed at elevated pressureIgor Sidorenko
1. The document studies the effect of operating pressure on particle motion near the wall in a fluidized bed. Luminescent pigment was used to illuminate particle clusters and their movement was analyzed using digital imaging.
2. Preliminary experiments showed particle residence time at the wall decreases with increasing fluidization velocity. Further experiments analyzed particle motion at similar fluidization velocities but varying operating pressure.
3. The results indicate operating pressure has some influence on particle motion for Geldart A particles near the wall, with higher pressures resulting in faster particle exchange and shorter residence times, as seen through the decay and shifting of illuminated particle clusters along the wall over time.
Magnetic field effect on mixed convection flow in a nanofluid under convectiv...IAEME Publication
An analysis is carried out to investigate the influence of the prominent magnetic effect on mixed convection heat and mass transfer in the boundary layer region of a semi-infinite vertical flat plate in a nanofluid under the convective boundary conditions. The transformed boundary layer,ordinary differential equations are solved numerically using Runge-Kutta Fourth order method.
The results show that, with proper selection of physical parameters, significant heat transfer
enhancements and pressure drop reductions can be achieved simultaneously with porous pin fins and
the overall heat transfer performances in porous pin fin channels are much better than those in
traditional solid pin fin channels. The effects of pore density are significant. As PPI increases, the
pressure drops and heat fluxes in porous pin fin channels increase while the overall heat transfer
efficiencies decrease and the maximal overall heat transfer efficiencies are obtained at PPI 20.
Furthermore, the effects of pin fin form are also remarkable. With the same physical parameters, the
overall heat transfer efficiencies in the long elliptic porous pin fin channels are the highest while they
are the lowest in the short elliptic porous pin fin channels
Investigation of the Effect of Nanoparticles Mean Diameter on Turbulent Mixed...A Behzadmehr
Abstract
Turbulent mixed convection of a nanofluid (water/Al2O3, Φ=.02) has been studied numerically. Two-phase
mixture model has been used to investigate the effects of nanoparticles mean diameter on the flow parameters. Nanoparticles distribution at the tube cross section shows that the particles are uniformly dispersed. The non-uniformity of the particles distribution occurs in the case of large nanoparticles and/or high value of the Grashof numbers. The study of particle size effect showed that the effective Nusselt number and turbulent intensity increases with the decreased of particle size.
Effect of Radiation on Mixed Convection Flow of a Non-Newtonian Nan fluid ove...IJMER
International Journal of Modern Engineering Research (IJMER) is Peer reviewed, online Journal. It serves as an international archival forum of scholarly research related to engineering and science education.
Study on Thermal and Hydrodynamic Indexes of a Nanofluid Flow in a Micro Heat...A Behzadmehr
The paper numerically presents laminar forced convection of a nanofluid flowing in a duct at microscale.
Results were compared with both analytical and experimental data and observed good concordance with
previous studies available in the literature. Influences of Brinkman and Reynolds number on thermal and
hydrodynamic indexes have been investigated. For a given nanofluid, no change in efficiency (heat dissipation
to pumping power) was observed with an increasing in Reynolds number. It was shown that the pressure was
decrease with an increase in Brinkman number. Dependency of Nu increment changes with substrate material.
Boundary layer flow and heat transfer of a dusty fluid over a vertical permea...eSAT Journals
This document discusses boundary layer flow and heat transfer of a dusty fluid over a vertical permeable stretching surface. The governing equations for steady, two-dimensional flow are presented and non-dimensionalized. The equations are then solved numerically using the Runge-Kutta method. Results are presented graphically showing the effects of various parameters like fluid-particle interaction, local Grashof number, radiation parameter, and Eckert number on flow and heat transfer characteristics. Comparisons are made to previous studies to validate the numerical method.
IRJET- Effect of Wavy Tube on Heat Transfer in a Concentric Tube Heat Exch...IRJET Journal
This document provides a review of research on using a wavy inner tube in a concentric tube heat exchanger to enhance heat transfer. It first discusses different heat transfer augmentation techniques, including active, passive and compound methods. It then reviews several previous studies that experimentally and numerically examined heat transfer performance of wavy tube heat exchangers. These studies found that a wavy inner tube could increase heat transfer by over 100% compared to a plain tube by generating swirl flow and turbulence. The document also reviews research on other passive techniques like wire coil inserts and their effects on heat transfer and pressure drop. Overall, the review shows that wavy tube and other passive inserts can significantly enhance heat transfer in heat exchangers.
Parametric Studies On Heat Transfer by Natural Convection from Inclined Cylin...IRJET Journal
This document provides an overview of parametric studies on heat transfer by natural convection from an inclined cylinder placed in a vertical channel. The parameters varied include heat input, aspect ratio (ratio of cylinder length to channel spacing), and cylinder elevation. The goal is to determine heat transfer characteristics and temperature distribution to develop correlations for design purposes. Previous studies investigated natural convection from inclined cylinders and cylinders in vertical channels. Results showed heat transfer increases with inclination angle and decreases with channel convergence.
Effect of Thermo-Diffusion and Chemical Reaction on Mixed Convective Heat And...IJERA Editor
A finite element study of combined heat and mass transfer flow through a porous medium in a circular cylindrical annulus with Soret and Dufour effects in the presence of heat sources has been analyzed. The coupled velocity, energy, and diffusion equations are solved numerically by using Galerkin- finite element technique. Shear stress, Nusslet number and Sherwood number are evaluated numerically for different values of the governing parameters under consideration and are shown in tabular form.
This document reviews research on the heat transfer of nanofluids when an electric or magnetic field is applied. It discusses how applied fields can affect the heat transfer performance and mechanisms of nanofluids. While studies show fields can significantly impact nanofluid heat transfer, there are differing opinions on their exact effects and mechanisms. The document aims to analyze the mechanism of thermal conductivity enhancement in nanofluids and how applied fields induce chaotic convection and heat transfer enhancement.
This document summarizes a numerical study on mixed convection flow from a moving vertical plate in a parallel free stream. The plate moves with constant velocity in the direction of the flow. The study considers the effects of thermophoresis and thermal radiation on the flow. The governing equations are non-dimensionalized and solved using an implicit finite difference scheme. Results for the velocity and concentration profiles and wall deposition velocity are presented for various parameter values. The results are verified by comparing with previous studies and good agreement is found. Key parameters influencing the flow include thermophoresis, mixed convection, thermal radiation, and the plate and free stream velocities.
Effects of Thermal Radiation and Chemical Reaction on MHD Free Convection Flo...IJERA Editor
This paper analyzes the radiation and chemical reaction effects on MHD steady two-dimensional laminar
viscous incompressible radiating boundary layer flow over a flat plate in the presence of internal heat generation
and convective boundary condition. It is assumed that lower surface of the plate is in contact with a hot fluid
while a stream of cold fluid flows steadily over the upper surface with a heat source that decays exponentially.
The Rosseland approximation is used to describe radiative heat transfer as we consider optically thick fluids.
The governing boundary layer equations are transformed into a system of ordinary differential equations using
similarity transformations, which are then solved numerically by employing fourth order Runge-Kutta method
along with shooting technique. The effects of various material parameters on the velocity, temperature and
concentration as well as the skin friction coefficient, the Nusselt number, the Sherwood number and the plate
surface temperature are illustrated and interpreted in physical terms. A comparison of present results with
previously published results shows an excellent agreement.
Effects of Variable Fluid Properties and MHD on Mixed Convection Heat Transfe...IOSR Journals
The effects of variable Fluid Properties like variation of permeability, porosity, thermal conductivity and magnetic field on Mixed Convection Heat transfer from Vertical Heated Plate Embedded in a Sparsely Packed Porous Medium have been approached numerically. The boundary layer flow in the porous medium is governed by Lapwood – Forchheimer – Brinkman extended Darcy model and the Lorentz force. The natures of these equations are highly non-linear and coupled each other. The non-linear differential equations are non-dimensionalised using the non-dimensional parameter involving Grashoff number Gr, Prandtl number Pr, Hartmann number M, Eckert number E and so on. Similarity transformations are employed and the resulting ordinary differential equations are solved numerically by using shooting algorithm with Runge – Kutta and Newton – Raphson method to obtain velocity and temperature distributions. Besides, skin friction and Nusselt number are also computed for various physical parameters governing the problem under consideration. It is found that the inertial parameter has a significant influence in decreasing the flow field, whereas its influence is reversed on the rate of heat transfer for all values of permeability considered. The effect of Magnetic field is diminution with velocity of the fluid flow. Further, the obtained results under the two limiting conditions were found to be in good agreement with the existing results
In compact heat exchangers, thermal resistance is generally dominant on the air-side and may
account for 80% or more of the total thermal resistance. The air-side heat transfer surface area is 8 to
10 times larger than the water-side. Any improvement in the heat transfer on air-side therefore
improves the overall performance of the heat exchanger. Due to the high thermal resistance on the
air-side, the optimization of such fins is essential to increase the performance of the heat exchangers
which results in thermal systems enhancement. This helps to reduce CO2 emissions through a
reduction of mass and fuel consumption.
Optimization of louvered fin geometry in such heat exchangers is essential to increase the
heat transfer performance and reduce weight, packaging, and cost requirements. In this study deals
with Computational Fluid Dynamics (CFD) studies of the interactions between the air flow and
louvered fins which equipped the automotive heat exchangers is carried out. 3D numerical
simulation results is obtained by using the ANSYS Fluent 14.0 code and compared with
experimental data. Finally the effect of louver angle and louver pitch geometrical parameters, on
overall thermal hydraulic performances of louvered fins is studied.
Porous media has two specifications: First its dissipation area is greater than the conventional fins that enhance heat convection. Second the irregular motion of the fluid flow around the individual beads mixes the fluid more effectively. Nanofluids are mixtures of base fluid with a very small amount of nanoparticles having dimensions from 1 to 100 nm, with very high thermal conductivities, so it would be the best convection heat transfer by using porous media and nanofluids. Thus studies need to be conducted involving nanofluids in porous media. For that, the purpose of this article is to summarize the published subjects respect to the enhancement of convective heat transfer using porous media and nanofluids and identifies opportunities for future research.
NUMERICAL INVESTIGATION OF AN UNSTEADY MIXED CONVECTIVE MASS AND HEAT TRANSFE...IAEME Publication
In the present paper an analysis of mixed convection of an unsteady magneto hydrodynamic (MHD) flow of an incompressible viscous fluid through porous media due to a vertical porous stretching sheet in the presence of viscous dissipation, thermal radiation and heat source /sink has been carried out. The fluid considered is viscous and incompressible. The governing partial differential equations of the flow, mass and heat transfer are highly non linear hence are converted into a system of ordinary differential equations using suitable similarity transformations. These ordinary differential equations are further converted into 7 first order ordinary differential equations and are solved numerically by Matlab ode-45 solver via shooting method.
A Review Paper on Fin Efficiency Enhancementijtsrd
From the previous couple of decades no of endeavours have made by scientists to upgrade the rate of heat transfer with the utilization of fins by differing number of parameters. The parameters like fin geometries, fin spacing, temperature dissemination, height, length have been explored in this paper. The paper gives some short audits about the methods for improving the rate of heat transfer by use of fins. Principle thought process of the paper is to give some concise information about the efficiency enhancements that can be made in fins to improve heat transfer rate. Naveen Kumar | Udit Singhal "A Review Paper on Fin Efficiency Enhancement" Published in International Journal of Trend in Scientific Research and Development (ijtsrd), ISSN: 2456-6470, Volume-4 | Issue-1 , December 2019, URL: https://www.ijtsrd.com/papers/ijtsrd29543.pdf Paper URL: https://www.ijtsrd.com/engineering/mechanical-engineering/29543/a-review-paper-on-fin-efficiency-enhancement/naveen-kumar
Effects of Variable Viscosity and Thermal Conductivity on MHD Free Convection...IRJET Journal
This document summarizes a numerical study that examines the effects of temperature dependent viscosity and thermal conductivity on the steady, laminar boundary layer flow of a dusty fluid near a vertically stretching sheet. The study considers magnetohydrodynamic (MHD) free convection flow with heat generation. The governing nonlinear partial differential equations are reduced to ordinary differential equations using similarity transformations and then solved numerically using a shooting method. Results for velocity, temperature, species concentration, and skin friction, Nusselt, and Sherwood numbers are obtained and analyzed for various physical parameters, providing insights into heat and mass transfer with practical applications in industries like material processing and manufacturing.
1. article in mathematical problems in engineering 2020MohamedSANNAD2
This document summarizes a numerical study that simulated natural convection heat transfer in a cubical cavity filled with nanofluids. The cavity is heated by a partition maintained at a hot temperature, while the right and left walls are kept at a cold temperature and the rest are adiabatic. Results show that increasing the Rayleigh number, volume fraction of nanoparticles, and size of the heating partition all improve heat transfer. Copper-based nanofluids provided the best thermal transfer. The study analyzes temperature, velocity and heat transfer to understand how nanofluids affect natural convection in 3D enclosures.
This document summarizes a research article that analyzes the stability of a horizontal porous layer saturated with a viscoelastic nanofluid when the boundaries are subjected to periodic temperature modulation. The analysis uses the Darcy-Brinkman-Oldroyd-B fluid model and considers infinitesimal disturbances. Three cases of oscillatory temperature fields are examined: symmetric modulation, asymmetric modulation, and modulation of only the bottom wall. A perturbation solution is obtained and the effect of modulation frequency on stability is shown. The stability is characterized by a correction Rayleigh number calculated as a function of various parameters representing viscoelasticity, concentration, porosity, heat capacity, and modulation frequency. Modulation is found to generally have a destabilizing
Effect of pitch on heat transfer characteristics of helical coils to be used ...eSAT Journals
This document discusses a study on the effect of pitch variation on heat transfer characteristics of helical coils used for biogas production. Three helical coil models with the same dimensions but different pitches (75mm, 50mm, 25mm) were modeled and analyzed using computational fluid dynamics (CFD). The results showed that increasing pitch enhanced heat transfer but also increased pressure drop. Maintaining an optimal reactor temperature through efficient heat transfer from helical coils can improve biogas production.
The influence of pressure on fluidized bed behaviourIgor Sidorenko
Sidorenko, I., & Rhodes, M. J. (2002) The influence of pressure on fluidized bed behaviour. Paper presented at the World Congress on Particle Technology 4, Sydney.
THE EFFECT OF TRANSVERSE VIBRATION ON THE NATURAL CONVECTION HEAT TRANSFER IN...IAEME Publication
The effect of transverse vibration on the natural convection heat transfer in a
rectangular enclosure with an aspect ratio of 0.5 filled with air as a working fluid
aligned horizontally on a mechanical shaker generating a sinusoidal transverse
vibrational displacement was studied experimentally. The study was carried for a
Raghiely number between (3.77 - 10.8)*107 with applied heat flux between (20 - 45)
Watt. The vibrational experimental measurements were carried out for different
frequency ratio (0.87-1.6) and vibrational Rayleigh number ranged between (0.12 -
2.7)*107. The results of the heat transfer inside the enclosure without vibration show
a very close agreement with the published one. The vibrational heat transfer results
show that the behavior of different heat transfer convection parameters can be
affected by applying a forced vibration condition. It is shown that the high heat
transfer can be achieved at frequencies near to the system natural frequency at
constant heat flux. Also, it is concluded that a careful attention should be given to the
proper selection of heat flux and frequency ratio results in obtaining maximum values
of heat transfer parameters with low cost of power consumption.
The use of Electrical Capacitance Tomography to study the influence of pressu...Igor Sidorenko
Sidorenko, I., & Rhodes, M. J. (2001) The use of Electrical Capacitance Tomography to study the influence of pressure on fluidized bed behaviour. Paper presented at the 6th World Congress of Chemical Engineering, Melbourne.
This document discusses in-process quality assurance in pharmaceutical manufacturing. It defines quality as meeting consumer needs and outlines how quality is built into the manufacturing process through controls like following good manufacturing practices, input material control, process control, in-process checks, cross-checking, and product release controls. The document explains that in-process quality assurance is important to ensure products are consistently manufactured to quality standards by guiding operators about any deviations observed during production. It provides examples of in-process checks for various unit operations like blending, compression, and coating. The overall goal of in-process quality assurance is to reduce batch rejections and reprocessing by adopting controls that build quality into each stage of the manufacturing process.
This document provides information on various powder handling solutions from Palamatic Process, including:
1) Flexible fittings that allow for sealed connections between pipe sections without tools.
2) Various types of vibrators that use mechanical or pneumatic methods to prevent clogging and improve flow, such as ball, roller, and turbine vibrators.
3) Fluidization solutions like nozzles, aeration pads, and air cannons that use air to fluidize powders for improved flow.
4) Additional mechanical solutions and specific coatings to facilitate powder flow and handling.
The document provides technical details on each type of solution and their applications in powder processing and material handling.
The document discusses various granulation techniques used in pharmaceutical manufacturing. It begins with an introduction to granules and granulation. It then covers different granulation methods including dry granulation, wet granulation and advanced techniques like fluid bed granulation, extrusion-spheronization, steam granulation and melt granulation. The document provides details on the process, equipment used, advantages and disadvantages of each method. It aims to explain why granulation is important and the various ways it can be achieved.
This document provides an overview of circulating fluidized bed (CFB) boiler design, operation, and maintenance. It begins with introductions to CFB development, typical components, advantages, and hydrodynamic regimes. Key points covered include the bubbling, turbulent, and fast fluidization regimes; effects of circulation rate and particle size on voidage profiles; and the core-annulus model of particle flow. Combustion stages and factors affecting efficiency are then discussed, along with considerations for biomass combustion such as agglomeration risks. The document aims to provide understanding of CFB hydrodynamics, combustion, design basics, and operational/maintenance topics.
IRJET- Effect of Wavy Tube on Heat Transfer in a Concentric Tube Heat Exch...IRJET Journal
This document provides a review of research on using a wavy inner tube in a concentric tube heat exchanger to enhance heat transfer. It first discusses different heat transfer augmentation techniques, including active, passive and compound methods. It then reviews several previous studies that experimentally and numerically examined heat transfer performance of wavy tube heat exchangers. These studies found that a wavy inner tube could increase heat transfer by over 100% compared to a plain tube by generating swirl flow and turbulence. The document also reviews research on other passive techniques like wire coil inserts and their effects on heat transfer and pressure drop. Overall, the review shows that wavy tube and other passive inserts can significantly enhance heat transfer in heat exchangers.
Parametric Studies On Heat Transfer by Natural Convection from Inclined Cylin...IRJET Journal
This document provides an overview of parametric studies on heat transfer by natural convection from an inclined cylinder placed in a vertical channel. The parameters varied include heat input, aspect ratio (ratio of cylinder length to channel spacing), and cylinder elevation. The goal is to determine heat transfer characteristics and temperature distribution to develop correlations for design purposes. Previous studies investigated natural convection from inclined cylinders and cylinders in vertical channels. Results showed heat transfer increases with inclination angle and decreases with channel convergence.
Effect of Thermo-Diffusion and Chemical Reaction on Mixed Convective Heat And...IJERA Editor
A finite element study of combined heat and mass transfer flow through a porous medium in a circular cylindrical annulus with Soret and Dufour effects in the presence of heat sources has been analyzed. The coupled velocity, energy, and diffusion equations are solved numerically by using Galerkin- finite element technique. Shear stress, Nusslet number and Sherwood number are evaluated numerically for different values of the governing parameters under consideration and are shown in tabular form.
This document reviews research on the heat transfer of nanofluids when an electric or magnetic field is applied. It discusses how applied fields can affect the heat transfer performance and mechanisms of nanofluids. While studies show fields can significantly impact nanofluid heat transfer, there are differing opinions on their exact effects and mechanisms. The document aims to analyze the mechanism of thermal conductivity enhancement in nanofluids and how applied fields induce chaotic convection and heat transfer enhancement.
This document summarizes a numerical study on mixed convection flow from a moving vertical plate in a parallel free stream. The plate moves with constant velocity in the direction of the flow. The study considers the effects of thermophoresis and thermal radiation on the flow. The governing equations are non-dimensionalized and solved using an implicit finite difference scheme. Results for the velocity and concentration profiles and wall deposition velocity are presented for various parameter values. The results are verified by comparing with previous studies and good agreement is found. Key parameters influencing the flow include thermophoresis, mixed convection, thermal radiation, and the plate and free stream velocities.
Effects of Thermal Radiation and Chemical Reaction on MHD Free Convection Flo...IJERA Editor
This paper analyzes the radiation and chemical reaction effects on MHD steady two-dimensional laminar
viscous incompressible radiating boundary layer flow over a flat plate in the presence of internal heat generation
and convective boundary condition. It is assumed that lower surface of the plate is in contact with a hot fluid
while a stream of cold fluid flows steadily over the upper surface with a heat source that decays exponentially.
The Rosseland approximation is used to describe radiative heat transfer as we consider optically thick fluids.
The governing boundary layer equations are transformed into a system of ordinary differential equations using
similarity transformations, which are then solved numerically by employing fourth order Runge-Kutta method
along with shooting technique. The effects of various material parameters on the velocity, temperature and
concentration as well as the skin friction coefficient, the Nusselt number, the Sherwood number and the plate
surface temperature are illustrated and interpreted in physical terms. A comparison of present results with
previously published results shows an excellent agreement.
Effects of Variable Fluid Properties and MHD on Mixed Convection Heat Transfe...IOSR Journals
The effects of variable Fluid Properties like variation of permeability, porosity, thermal conductivity and magnetic field on Mixed Convection Heat transfer from Vertical Heated Plate Embedded in a Sparsely Packed Porous Medium have been approached numerically. The boundary layer flow in the porous medium is governed by Lapwood – Forchheimer – Brinkman extended Darcy model and the Lorentz force. The natures of these equations are highly non-linear and coupled each other. The non-linear differential equations are non-dimensionalised using the non-dimensional parameter involving Grashoff number Gr, Prandtl number Pr, Hartmann number M, Eckert number E and so on. Similarity transformations are employed and the resulting ordinary differential equations are solved numerically by using shooting algorithm with Runge – Kutta and Newton – Raphson method to obtain velocity and temperature distributions. Besides, skin friction and Nusselt number are also computed for various physical parameters governing the problem under consideration. It is found that the inertial parameter has a significant influence in decreasing the flow field, whereas its influence is reversed on the rate of heat transfer for all values of permeability considered. The effect of Magnetic field is diminution with velocity of the fluid flow. Further, the obtained results under the two limiting conditions were found to be in good agreement with the existing results
In compact heat exchangers, thermal resistance is generally dominant on the air-side and may
account for 80% or more of the total thermal resistance. The air-side heat transfer surface area is 8 to
10 times larger than the water-side. Any improvement in the heat transfer on air-side therefore
improves the overall performance of the heat exchanger. Due to the high thermal resistance on the
air-side, the optimization of such fins is essential to increase the performance of the heat exchangers
which results in thermal systems enhancement. This helps to reduce CO2 emissions through a
reduction of mass and fuel consumption.
Optimization of louvered fin geometry in such heat exchangers is essential to increase the
heat transfer performance and reduce weight, packaging, and cost requirements. In this study deals
with Computational Fluid Dynamics (CFD) studies of the interactions between the air flow and
louvered fins which equipped the automotive heat exchangers is carried out. 3D numerical
simulation results is obtained by using the ANSYS Fluent 14.0 code and compared with
experimental data. Finally the effect of louver angle and louver pitch geometrical parameters, on
overall thermal hydraulic performances of louvered fins is studied.
Porous media has two specifications: First its dissipation area is greater than the conventional fins that enhance heat convection. Second the irregular motion of the fluid flow around the individual beads mixes the fluid more effectively. Nanofluids are mixtures of base fluid with a very small amount of nanoparticles having dimensions from 1 to 100 nm, with very high thermal conductivities, so it would be the best convection heat transfer by using porous media and nanofluids. Thus studies need to be conducted involving nanofluids in porous media. For that, the purpose of this article is to summarize the published subjects respect to the enhancement of convective heat transfer using porous media and nanofluids and identifies opportunities for future research.
NUMERICAL INVESTIGATION OF AN UNSTEADY MIXED CONVECTIVE MASS AND HEAT TRANSFE...IAEME Publication
In the present paper an analysis of mixed convection of an unsteady magneto hydrodynamic (MHD) flow of an incompressible viscous fluid through porous media due to a vertical porous stretching sheet in the presence of viscous dissipation, thermal radiation and heat source /sink has been carried out. The fluid considered is viscous and incompressible. The governing partial differential equations of the flow, mass and heat transfer are highly non linear hence are converted into a system of ordinary differential equations using suitable similarity transformations. These ordinary differential equations are further converted into 7 first order ordinary differential equations and are solved numerically by Matlab ode-45 solver via shooting method.
A Review Paper on Fin Efficiency Enhancementijtsrd
From the previous couple of decades no of endeavours have made by scientists to upgrade the rate of heat transfer with the utilization of fins by differing number of parameters. The parameters like fin geometries, fin spacing, temperature dissemination, height, length have been explored in this paper. The paper gives some short audits about the methods for improving the rate of heat transfer by use of fins. Principle thought process of the paper is to give some concise information about the efficiency enhancements that can be made in fins to improve heat transfer rate. Naveen Kumar | Udit Singhal "A Review Paper on Fin Efficiency Enhancement" Published in International Journal of Trend in Scientific Research and Development (ijtsrd), ISSN: 2456-6470, Volume-4 | Issue-1 , December 2019, URL: https://www.ijtsrd.com/papers/ijtsrd29543.pdf Paper URL: https://www.ijtsrd.com/engineering/mechanical-engineering/29543/a-review-paper-on-fin-efficiency-enhancement/naveen-kumar
Effects of Variable Viscosity and Thermal Conductivity on MHD Free Convection...IRJET Journal
This document summarizes a numerical study that examines the effects of temperature dependent viscosity and thermal conductivity on the steady, laminar boundary layer flow of a dusty fluid near a vertically stretching sheet. The study considers magnetohydrodynamic (MHD) free convection flow with heat generation. The governing nonlinear partial differential equations are reduced to ordinary differential equations using similarity transformations and then solved numerically using a shooting method. Results for velocity, temperature, species concentration, and skin friction, Nusselt, and Sherwood numbers are obtained and analyzed for various physical parameters, providing insights into heat and mass transfer with practical applications in industries like material processing and manufacturing.
1. article in mathematical problems in engineering 2020MohamedSANNAD2
This document summarizes a numerical study that simulated natural convection heat transfer in a cubical cavity filled with nanofluids. The cavity is heated by a partition maintained at a hot temperature, while the right and left walls are kept at a cold temperature and the rest are adiabatic. Results show that increasing the Rayleigh number, volume fraction of nanoparticles, and size of the heating partition all improve heat transfer. Copper-based nanofluids provided the best thermal transfer. The study analyzes temperature, velocity and heat transfer to understand how nanofluids affect natural convection in 3D enclosures.
This document summarizes a research article that analyzes the stability of a horizontal porous layer saturated with a viscoelastic nanofluid when the boundaries are subjected to periodic temperature modulation. The analysis uses the Darcy-Brinkman-Oldroyd-B fluid model and considers infinitesimal disturbances. Three cases of oscillatory temperature fields are examined: symmetric modulation, asymmetric modulation, and modulation of only the bottom wall. A perturbation solution is obtained and the effect of modulation frequency on stability is shown. The stability is characterized by a correction Rayleigh number calculated as a function of various parameters representing viscoelasticity, concentration, porosity, heat capacity, and modulation frequency. Modulation is found to generally have a destabilizing
Effect of pitch on heat transfer characteristics of helical coils to be used ...eSAT Journals
This document discusses a study on the effect of pitch variation on heat transfer characteristics of helical coils used for biogas production. Three helical coil models with the same dimensions but different pitches (75mm, 50mm, 25mm) were modeled and analyzed using computational fluid dynamics (CFD). The results showed that increasing pitch enhanced heat transfer but also increased pressure drop. Maintaining an optimal reactor temperature through efficient heat transfer from helical coils can improve biogas production.
The influence of pressure on fluidized bed behaviourIgor Sidorenko
Sidorenko, I., & Rhodes, M. J. (2002) The influence of pressure on fluidized bed behaviour. Paper presented at the World Congress on Particle Technology 4, Sydney.
THE EFFECT OF TRANSVERSE VIBRATION ON THE NATURAL CONVECTION HEAT TRANSFER IN...IAEME Publication
The effect of transverse vibration on the natural convection heat transfer in a
rectangular enclosure with an aspect ratio of 0.5 filled with air as a working fluid
aligned horizontally on a mechanical shaker generating a sinusoidal transverse
vibrational displacement was studied experimentally. The study was carried for a
Raghiely number between (3.77 - 10.8)*107 with applied heat flux between (20 - 45)
Watt. The vibrational experimental measurements were carried out for different
frequency ratio (0.87-1.6) and vibrational Rayleigh number ranged between (0.12 -
2.7)*107. The results of the heat transfer inside the enclosure without vibration show
a very close agreement with the published one. The vibrational heat transfer results
show that the behavior of different heat transfer convection parameters can be
affected by applying a forced vibration condition. It is shown that the high heat
transfer can be achieved at frequencies near to the system natural frequency at
constant heat flux. Also, it is concluded that a careful attention should be given to the
proper selection of heat flux and frequency ratio results in obtaining maximum values
of heat transfer parameters with low cost of power consumption.
The use of Electrical Capacitance Tomography to study the influence of pressu...Igor Sidorenko
Sidorenko, I., & Rhodes, M. J. (2001) The use of Electrical Capacitance Tomography to study the influence of pressure on fluidized bed behaviour. Paper presented at the 6th World Congress of Chemical Engineering, Melbourne.
This document discusses in-process quality assurance in pharmaceutical manufacturing. It defines quality as meeting consumer needs and outlines how quality is built into the manufacturing process through controls like following good manufacturing practices, input material control, process control, in-process checks, cross-checking, and product release controls. The document explains that in-process quality assurance is important to ensure products are consistently manufactured to quality standards by guiding operators about any deviations observed during production. It provides examples of in-process checks for various unit operations like blending, compression, and coating. The overall goal of in-process quality assurance is to reduce batch rejections and reprocessing by adopting controls that build quality into each stage of the manufacturing process.
This document provides information on various powder handling solutions from Palamatic Process, including:
1) Flexible fittings that allow for sealed connections between pipe sections without tools.
2) Various types of vibrators that use mechanical or pneumatic methods to prevent clogging and improve flow, such as ball, roller, and turbine vibrators.
3) Fluidization solutions like nozzles, aeration pads, and air cannons that use air to fluidize powders for improved flow.
4) Additional mechanical solutions and specific coatings to facilitate powder flow and handling.
The document provides technical details on each type of solution and their applications in powder processing and material handling.
The document discusses various granulation techniques used in pharmaceutical manufacturing. It begins with an introduction to granules and granulation. It then covers different granulation methods including dry granulation, wet granulation and advanced techniques like fluid bed granulation, extrusion-spheronization, steam granulation and melt granulation. The document provides details on the process, equipment used, advantages and disadvantages of each method. It aims to explain why granulation is important and the various ways it can be achieved.
This document provides an overview of circulating fluidized bed (CFB) boiler design, operation, and maintenance. It begins with introductions to CFB development, typical components, advantages, and hydrodynamic regimes. Key points covered include the bubbling, turbulent, and fast fluidization regimes; effects of circulation rate and particle size on voidage profiles; and the core-annulus model of particle flow. Combustion stages and factors affecting efficiency are then discussed, along with considerations for biomass combustion such as agglomeration risks. The document aims to provide understanding of CFB hydrodynamics, combustion, design basics, and operational/maintenance topics.
The document discusses the construction, working, validation process, and qualification protocols for a fluidized bed dryer (FBD) used in pharmaceutical applications. It describes the key components of an FBD and the fluidization drying process. Validation of the FBD involves design, installation, operational, and performance qualifications to ensure proper functioning.
Circulating fluidized bed boiler (cfb boiler) how does it work and its principlePichai Chaibamrung
This document provides an overview of circulating fluidized bed boilers. It begins with biographical information about the author Pichai Chaibamrung, followed by an outline of the content to be covered. The content sections include introductions to circulating fluidized bed design, hydrodynamics, combustion, heat transfer, and cyclone separators. Key points are made about fluidization regimes, characteristics of fast fluidized beds, stages of combustion, and factors impacting combustion efficiency.
This document discusses heat optimization in cement production processes. It identifies major areas of heat loss, including through shell radiation, unused heat in exit gases and cooler exit air. The goal of design engineers is to minimize heat losses and optimize consumption. Key factors that influence heat losses are discussed for the preheater, calciner, kiln and cooler systems. Different burner and flame types are also examined in relation to combustion efficiency and heat distribution in the kiln. Heat balances are provided as examples to account for all heat inputs and outputs in the clinker production process.
The document discusses the history and pharmacodynamics of inhalational anesthetics. It summarizes that no single individual discovered anesthesia, but rather discoveries were made across scientific disciplines by curious individuals. It then discusses several landmark discoveries and uses of anesthetic agents from the 18th century onward. The document also summarizes some of the leading theories about how anesthetic agents produce their effects, including lipid solubility theories and theories related to their interactions with lipid bilayers and proteins like ion channels. Finally, it briefly discusses sites of anesthetic action in the body and factors that can influence their potency.
Stage III: Stage of Surgical Anaesthesia
- Begins after excitement stage ends and lasts until anaesthetic is stopped
- Patient is unconscious and has regular breathing
- Pupils are dilated and fixed
- Reflexes like eyelash, swallowing are lost
- Surgery can be safely performed during this stage
The document studied the effect of various operating parameters on the heat transfer coefficient in a gas-solid fluidized bed using a horizontal heat transfer probe. Experiments were conducted in a fluidized bed with different particle sizes, bed inventories, heat fluxes, and air velocities. The results showed that the heat transfer coefficient increased with air velocity and bed inventory, but decreased with particle size. The heat transfer coefficient was also directly proportional to the applied heat flux. The study provides insights into heat transfer in gas-solid fluidized beds and how it is impacted by key operating parameters.
This document summarizes a numerical study on heat transfer enhancement using porous pin fins in rectangular channels. The study uses ANSYS Fluent to simulate forced convection heat transfer under varying parameters like Reynolds number, pore density, and pin fin shape. Results show that porous pin fins can significantly enhance heat transfer and reduce pressure drop compared to solid pin fins. Higher pore density increases heat flux and pressure drop but lowers overall heat transfer efficiency. Long elliptic pin fins produce the highest efficiencies while short elliptic pins produce the lowest. Gaps in previous studies are identified, such as a lack of investigation into other working fluids like nanofluids and discrete heating of partially porous channels.
A Detailed Review on Artificial Roughness Geometries for Optimizing Thermo-Hy...IJMER
It is well known fact that the heat transfer coefficient between the absorber surface of solar air collector & flowing fluid i.e. air can be improved by providing artificial roughness geometry on heat transfer surface (absorber surface).In this way the Thermal efficiency is increased. But at the same time due to roughness geometry pumping power of solar air collector in increased due to fictional losses in duct. So it necessary to examine the shape, size & flow pattern of various roughness elements to get maximum efficiency with minimum frictional losses. Therefore the selection of roughness geometry has to be based on the parameter that takes into account both Thermal & Hydraulic (friction) performance i.e. Thermo-hydraulic Performance of Solar air collector. Number of roughness elements has been investigated on heat transfer & friction characteristics of solar air collectors. In this paper, reviews of various artificial roughness elements used as passive heat transfer techniques, in order to improve Thermo-hydraulic performance of solar air collectors is reviewed & presented. Correlations developed by various researchers with the help of experimental results for heat transfer & friction factor for solar air collector by taking different roughness geometries are given & these correlations are useful to predict the Thermo-hydraulic performance of solar air collector having roughened ducts. The objective of this paper is also the awareness of effect of various types’ roughness geometries on heat
NUMERICAL SIMULATION OF FORCED CONVECTION HEAT TRANSFER ENHANCEMENT BY POROUS...IAEME Publication
Pin fins have a variety of applications in industry due to their excellent heat transfer performance, e.g., in cooling of electronic components, in cooling of gas turbine blades, and
recently, in hot water boilers of central heating systems. The forced convective heat transfer in three dimensional porous pin fin channels is numerically studied using ANSYS Fluent. Geometric modelling is done using Design Modeller and CFD Meshing is carried out using ANSYS Meshing Preprocessor. The effects of Reynolds number (Re), pore density (PPI) and pin fin form are studied in detail.
Mixed convection heat transfer in inclined tubes with constant heat flux, eur...Ahmed Al-Sammarraie
The document summarizes previous research on mixed convection heat transfer in inclined tubes and describes an experimental study. The study investigated the effects of heat flux, tube inclination angles, and tube diameters on heat transfer for laminar to turbulent air flows in inclined circular tubes under constant wall heat flux. Local and average Nusselt numbers were measured for tube inclinations of 30°, 45°, and 60° and diameters of 0.75, 1.5, and 2 inches. The results showed that Nusselt numbers increased with higher heat flux and as the tube moved from 60° to 30° inclination, and decreased with larger diameter to length ratios.
Mixed convection heat transferin inclined tubes with constant heat fluxOzyegin University
The document summarizes previous research on mixed convection heat transfer in inclined tubes and describes an experimental study. The study investigated the effects of heat flux, tube inclination angles, and tube diameters on heat transfer for laminar to turbulent air flows in inclined circular tubes under constant wall heat flux. Local and average Nusselt numbers were measured for tube inclinations of 30°, 45°, and 60° and diameters of 0.75, 1.5, and 2 inches. The results showed that Nusselt numbers increased with higher heat flux and as the tube moved from 60° to 30° inclination, and decreased with larger diameter to length ratios.
Evaluation of Shell and Tube Heat Exchanger Performance by Using ZnO/Water Na...Barhm Mohamad
To examine and investigate the impact of nanofluid on heat exchanger performance, including the total heat transfer, the effect of friction factor, the average Nusselt number, and the thermal efficiency, the output heat transfers of a shell and tube heat exchanger using ZnO nanoparticles suspended in water has been conducted numerically. The governing equations were solved using finite volume techniques and CFD simulations with ANSYS/FLUENT Solver 2021. The nanoparticles volume fractions adopted are 0.2% and 0.35% that used in numerical computations under 200 to 1400 Reynolds numbers range. The increasing of temperature is approximately 13% from the bottom to the top of heat exchanger, while the maximum enhancement of Nusselt number is about 10%, 19% for volume fractions 0.2% and 0.35% respectively. The elevated values of the friction factor at the volumetric ratios of 0.2% and 0.35% are 0.25% and 0.47% respectively. The findings demonstrate that the performance efficiency of shell and tube heat exchanger is enhanced due to the increase in Nusselt number.
experimental investigation of heat transfer intensification of pin fins under...INFOGAIN PUBLICATION
Recent development era in technology has huge requirement of high performance lightweight, and compact heat transfer equipment. To accomplish this demand fins are widely used as effective elements for heat transfer enhancement. One of the commonly used heat exchanger fins is the pin fin which offers an economical and trouble free solution in many situations. This is more important in cooling of air conditioning equipment, thermal power plants, gas turbine blade, aerospace industry, combustion chamber liners, and biomedical devices, electrical and electronic component. Therefore now a day’s industries are utilizing thermal system with pin fins and analyse the various influencing parameters on performance of pin fin of different geometry under force convection. The turbulence occurred due to these techniques are good enough to enhance heat transfer rate. This article is focused on comprehensive review of work carried out in this technology.
Heat Transfer Analysis of a Plate Heat Exchanger with a Combination of Ribs a...ijtsrd
The advancements and improvements in all heat transfer equipment’s are primarily intended to save energy and reduce project capital investment expenses energy or material . A better heat exchanger is one that can transfer a high heat rate while using a low pumping power and at a cheap cost. Passive heat transfer enhancement techniques have various benefits over other heat transfer enhancement techniques, including low cost, ease of fabrication, and installation. Rib turbulators can enhance heat transmission significantly, but they generally come at a considerable cost in terms of pressure loss. Dimple techniques have lately gained popularity because to their ability to promote heat transmission while imposing a minor pressure penalty. When dimple surfaces are mixed with nanofluids, some studies have seen increased heat transmission, but the key concern is an increase in the systems friction factor, which is also regulated within acceptable ranges. The thermal characteristics of a heat exchanger with a combination of dimple ribs were evaluated using a 3 dimensional numerical 3 D simulation. The subject of this study is the handling of air flow velocity through the channel, which was changed from 3.97 to 5.80 m s. The simulation programme ANSYS 19.2 was used to investigate the heat transfer physiognomies of a heat exchanger managing a combination of dimple ribs. The numerical findings revealed that the combination of dimple ribs greatly improved heat transmission over the dimple alone. In comparison, the average Nusselt number of a channel with dimpled Plate is 4.28 percent more than that of a channel with dimpled ribs. Prof. Pushparaj Singh | Navin Kumar "Heat Transfer Analysis of a Plate Heat Exchanger with a Combination of Ribs and Dimples using CFD" Published in International Journal of Trend in Scientific Research and Development (ijtsrd), ISSN: 2456-6470, Volume-6 | Issue-4 , June 2022, URL: https://www.ijtsrd.com/papers/ijtsrd49887.pdf Paper URL: https://www.ijtsrd.com/engineering/mechanical-engineering/49887/heat-transfer-analysis-of-a-plate-heat-exchanger-with-a-combination-of-ribs-and-dimples-using-cfd/prof-pushparaj-singh
Numerical Study of Heat Transfer in Ternary Nanofluid Over a Stretching Sheet...Atif75347
The new method of enhancing heat transfer through tri- hybrid nanofluid is discussed in the current study and represented in differential equation system.
Effect of Wavy Tube on Heat Transfer in a Concentric Tube Heat Exchanger: A R...IRJET Journal
This document provides a review of research on using a wavy inner tube in a concentric tube heat exchanger to enhance heat transfer. Several studies have found that a wavy inner tube can increase the Nusselt number, friction factor, and thermal performance factor compared to a plain inner tube. Computational fluid dynamics simulations have also validated that wavy fins and tubes promote longitudinal vortices that augment heat transfer, while transverse vortices have a negative effect. Overall, experiments and models show that a wavy inner tube can enhance heat transfer in a concentric tube heat exchanger by over 100% in some cases.
This document discusses a numerical investigation of the geometry of louvered fins in automotive radiator compact heat exchangers. Computational fluid dynamics simulations were performed using ANSYS Fluent to analyze the interactions between air flow and louvered fins. The effects of louver angle and pitch on thermal hydraulic performance were studied. The results were compared to experimental data to validate the simulations. Optimization of louvered fin geometry can increase heat transfer performance while reducing weight and cost requirements.
IJERA (International journal of Engineering Research and Applications) is International online, ... peer reviewed journal. For more detail or submit your article, please visit www.ijera.com
THERMO HYDRAULICS PERFORMANCE OF TURBULENT FLOW HEAT TRANSFER THROUGH SQUARE ...IAEME Publication
This paper describes the experimental study of square ducts with inserts. Experiments are conducted for air with uniform heat flux condition. The top wall surface is made rough with metal ribs of square section. The roughened wall is uniformly heated and other walls are insulated. The heat transfer coefficient enhances square channel at injection of different inserts. The performance of the geometry under investigation has been evaluated .The heat transfer coefficient of air is increase by 46% than plane square ducts with inserts. The heat transfer and pressure drop measurements have been taken in separate sections .
NUMERICAL INVESTIGATION OF LAMINAR NANOFLUID FLOW IN MICRO CHANNEL HEAT SINKS IAEME Publication
The effect of using nanofluids on heat transfer and aerodynamics characteristics in rectangular shaped micro channel heat sink (MCHS) is numerically investigated for Reynolds number range of (100-400 ) and different value of heat flux (50 , 100, 150 ) / . In this study,the MCHS performance using tow type of nanofluid with volume
fraction 10% was used as a coolant is examined. The three-dimensional steady, laminar flow and heat transfer governing equations are solved using The computational fluid dynamics code (FLUENT). The MCHS performance is evaluated in terms of temperature profile, heat transfer,velocity profile, pressure drop and friction factor.
This document analyzes the thermal characteristics of flared and rectangular fin profiles using finite element analysis. Solid models of the fin geometries were created in SolidWorks. Meshing was performed in ANSYS using tetrahedral and hexahedral elements. Boundary conditions were set up and the analysis was run to obtain temperature distributions and heat fluxes. Results for the different fin profiles were compared to determine the more efficient design. Prior research on heat transfer analysis of fins using finite element methods is also reviewed.
Analysis of Natural Convention Heat Transfer Enhancement in Finned Tube Heat ...journal ijrtem
ABSTRACT: Most of the engineering problems require high performance heat transfer components with progressively less weight, volumes, accommodating shapes and costs. Air cooled heat exchangers are subjected to air on outer side of heat exchanger surface on in heat recovery systems like economizers gases are subjected on one side of tube surface. On air or gas side heat transfer coefficient is less. Extended surface (fins) are one of the next exchanging devices that are employed extensively to increase heat transfer rates from tubular heat exchangers. The rate of heat transfer depends on the surface area of fin available for exchanging the heat transfer rate from the primary surface of cylindrical shape. Present study focuses on enhancement of heat transfer by using both circular and elliptical type of fins. The present paper attempts to examine trend of heat transfer coefficient experimentally and by using CFD software for various types of elliptical fins with i) varying elliptical ratio, ii) changing orientation of mounting of heat exchanger tube with elliptical fins, iii) varying spacing or fin density. KEY WORDS: Natural convection, Heat transfer enhancements, Elliptical fin, Fin orientation, Fin density.
IOSR Journal of Mechanical and Civil Engineering (IOSR-JMCE) is an open access international journal that provides rapid publication (within a month) of articles in all areas of mechanical and civil engineering and its applications. The journal welcomes publications of high quality papers on theoretical developments and practical applications in mechanical and civil engineering. Original research papers, state-of-the-art reviews, and high quality technical notes are invited for publications.
This document discusses empirical correlations for mixed convection heat transfer through a fin array based on various orientations. It summarizes previous research on the effects of fin orientation and channel inclination angle on heat transfer. The current study investigates the effect of lateral and longitudinal channel inclination on heat transfer in a rectangular channel with longitudinal fins. Experimental results show that heat transfer is highest for a laterally inclined channel at 0 degrees and increases with longitudinal inclination angle. Empirical equations are developed to correlate Nusselt number with orientation angles, Reynolds number, and Grashof number.
CFD Analysis of Concentric Tube Heat Exchanger Using Twisted TapesIJARIIT
In this paper, the three dimensional CFD modeling studies on heat transfer, friction factor and thermal performance
of concentric tube heat exchanger using twisted tapes (Plain, V-cut, , Jagged V-cut) with different twist ratios (y=2.0, 4.0) are
used. Twisted tapes are used to augment the heat transfer by creating turbulence in the fluid flow. Various methods are applied
to increase thermal performance of heat transfer devices such as treated surfaces, rough surfaces, swirling flow devices, coiled
tubes, and surface tension devices. Out of these twisted tape method is used to increase the thermal performance. Twisted tape
inserts on effectiveness of heat exchanger has analyzed for different Reynolds Number. The maximum thermal performance
factor was obtained by the Jagged V-cut twisted tape (H=50) insert compare to other twisted tapes. Simultaneously the friction
factor has been analyzed
Submission Deadline: 30th September 2022
Acceptance Notification: Within Three Days’ time period
Online Publication: Within 24 Hrs. time Period
Expected Date of Dispatch of Printed Journal: 5th October 2022
MODELING AND ANALYSIS OF SURFACE ROUGHNESS AND WHITE LATER THICKNESS IN WIRE-...IAEME Publication
White layer thickness (WLT) formed and surface roughness in wire electric discharge turning (WEDT) of tungsten carbide composite has been made to model through response surface methodology (RSM). A Taguchi’s standard Design of experiments involving five input variables with three levels has been employed to establish a mathematical model between input parameters and responses. Percentage of cobalt content, spindle speed, Pulse on-time, wire feed and pulse off-time were changed during the experimental tests based on the Taguchi’s orthogonal array L27 (3^13). Analysis of variance (ANOVA) revealed that the mathematical models obtained can adequately describe performance within the parameters of the factors considered. There was a good agreement between the experimental and predicted values in this study.
A STUDY ON THE REASONS FOR TRANSGENDER TO BECOME ENTREPRENEURSIAEME Publication
The study explores the reasons for a transgender to become entrepreneurs. In this study transgender entrepreneur was taken as independent variable and reasons to become as dependent variable. Data were collected through a structured questionnaire containing a five point Likert Scale. The study examined the data of 30 transgender entrepreneurs in Salem Municipal Corporation of Tamil Nadu State, India. Simple Random sampling technique was used. Garrett Ranking Technique (Percentile Position, Mean Scores) was used as the analysis for the present study to identify the top 13 stimulus factors for establishment of trans entrepreneurial venture. Economic advancement of a nation is governed upon the upshot of a resolute entrepreneurial doings. The conception of entrepreneurship has stretched and materialized to the socially deflated uncharted sections of transgender community. Presently transgenders have smashed their stereotypes and are making recent headlines of achievements in various fields of our Indian society. The trans-community is gradually being observed in a new light and has been trying to achieve prospective growth in entrepreneurship. The findings of the research revealed that the optimistic changes are taking place to change affirmative societal outlook of the transgender for entrepreneurial ventureship. It also laid emphasis on other transgenders to renovate their traditional living. The paper also highlights that legislators, supervisory body should endorse an impartial canons and reforms in Tamil Nadu Transgender Welfare Board Association.
BROAD UNEXPOSED SKILLS OF TRANSGENDER ENTREPRENEURSIAEME Publication
Since ages gender difference is always a debatable theme whether caused by nature, evolution or environment. The birth of a transgender is dreadful not only for the child but also for their parents. The pain of living in the wrong physique and treated as second class victimized citizen is outrageous and fully harboured with vicious baseless negative scruples. For so long, social exclusion had perpetuated inequality and deprivation experiencing ingrained malign stigma and besieged victims of crime or violence across their life spans. They are pushed into the murky way of life with a source of eternal disgust, bereft sexual potency and perennial fear. Although they are highly visible but very little is known about them. The common public needs to comprehend the ravaged arrogance on these insensitive souls and assist in integrating them into the mainstream by offering equal opportunity, treat with humanity and respect their dignity. Entrepreneurship in the current age is endorsing the gender fairness movement. Unstable careers and economic inadequacy had inclined one of the gender variant people called Transgender to become entrepreneurs. These tiny budding entrepreneurs resulted in economic transition by means of employment, free from the clutches of stereotype jobs, raised standard of living and handful of financial empowerment. Besides all these inhibitions, they were able to witness a platform for skill set development that ignited them to enter into entrepreneurial domain. This paper epitomizes skill sets involved in trans-entrepreneurs of Thoothukudi Municipal Corporation of Tamil Nadu State and is a groundbreaking determination to sightsee various skills incorporated and the impact on entrepreneurship.
DETERMINANTS AFFECTING THE USER'S INTENTION TO USE MOBILE BANKING APPLICATIONSIAEME Publication
The banking and financial services industries are experiencing increased technology penetration. Among them, the banking industry has made technological advancements to better serve the general populace. The economy focused on transforming the banking sector's system into a cashless, paperless, and faceless one. The researcher wants to evaluate the user's intention for utilising a mobile banking application. The study also examines the variables affecting the user's behaviour intention when selecting specific applications for financial transactions. The researcher employed a well-structured questionnaire and a descriptive study methodology to gather the respondents' primary data utilising the snowball sampling technique. The study includes variables like performance expectations, effort expectations, social impact, enabling circumstances, and perceived risk. Each of the aforementioned variables has a major impact on how users utilise mobile banking applications. The outcome will assist the service provider in comprehending the user's history with mobile banking applications.
ANALYSE THE USER PREDILECTION ON GPAY AND PHONEPE FOR DIGITAL TRANSACTIONSIAEME Publication
Technology upgradation in banking sector took the economy to view that payment mode towards online transactions using mobile applications. This system enabled connectivity between banks, Merchant and user in a convenient mode. there are various applications used for online transactions such as Google pay, Paytm, freecharge, mobikiwi, oxygen, phonepe and so on and it also includes mobile banking applications. The study aimed at evaluating the predilection of the user in adopting digital transaction. The study is descriptive in nature. The researcher used random sample techniques to collect the data. The findings reveal that mobile applications differ with the quality of service rendered by Gpay and Phonepe. The researcher suggest the Phonepe application should focus on implementing the application should be user friendly interface and Gpay on motivating the users to feel the importance of request for money and modes of payments in the application.
VOICE BASED ATM FOR VISUALLY IMPAIRED USING ARDUINOIAEME Publication
The prototype of a voice-based ATM for visually impaired using Arduino is to help people who are blind. This uses RFID cards which contain users fingerprint encrypted on it and interacts with the users through voice commands. ATM operates when sensor detects the presence of one person in the cabin. After scanning the RFID card, it will ask to select the mode like –normal or blind. User can select the respective mode through voice input, if blind mode is selected the balance check or cash withdraw can be done through voice input. Normal mode procedure is same as the existing ATM.
IMPACT OF EMOTIONAL INTELLIGENCE ON HUMAN RESOURCE MANAGEMENT PRACTICES AMONG...IAEME Publication
There is increasing acceptability of emotional intelligence as a major factor in personality assessment and effective human resource management. Emotional intelligence as the ability to build capacity, empathize, co-operate, motivate and develop others cannot be divorced from both effective performance and human resource management systems. The human person is crucial in defining organizational leadership and fortunes in terms of challenges and opportunities and walking across both multinational and bilateral relationships. The growing complexity of the business world requires a great deal of self-confidence, integrity, communication, conflict and diversity management to keep the global enterprise within the paths of productivity and sustainability. Using the exploratory research design and 255 participants the result of this original study indicates strong positive correlation between emotional intelligence and effective human resource management. The paper offers suggestions on further studies between emotional intelligence and human capital development and recommends for conflict management as an integral part of effective human resource management.
VISUALISING AGING PARENTS & THEIR CLOSE CARERS LIFE JOURNEY IN AGING ECONOMYIAEME Publication
Our life journey, in general, is closely defined by the way we understand the meaning of why we coexist and deal with its challenges. As we develop the "inspiration economy", we could say that nearly all of the challenges we have faced are opportunities that help us to discover the rest of our journey. In this note paper, we explore how being faced with the opportunity of being a close carer for an aging parent with dementia brought intangible discoveries that changed our insight of the meaning of the rest of our life journey.
A STUDY ON THE IMPACT OF ORGANIZATIONAL CULTURE ON THE EFFECTIVENESS OF PERFO...IAEME Publication
The main objective of this study is to analyze the impact of aspects of Organizational Culture on the Effectiveness of the Performance Management System (PMS) in the Health Care Organization at Thanjavur. Organizational Culture and PMS play a crucial role in present-day organizations in achieving their objectives. PMS needs employees’ cooperation to achieve its intended objectives. Employees' cooperation depends upon the organization’s culture. The present study uses exploratory research to examine the relationship between the Organization's culture and the Effectiveness of the Performance Management System. The study uses a Structured Questionnaire to collect the primary data. For this study, Thirty-six non-clinical employees were selected from twelve randomly selected Health Care organizations at Thanjavur. Thirty-two fully completed questionnaires were received.
Living in 21st century in itself reminds all of us the necessity of police and its administration. As more and more we are entering into the modern society and culture, the more we require the services of the so called ‘Khaki Worthy’ men i.e., the police personnel. Whether we talk of Indian police or the other nation’s police, they all have the same recognition as they have in India. But as already mentioned, their services and requirements are different after the like 26th November, 2008 incidents, where they without saving their own lives has sacrificed themselves without any hitch and without caring about their respective family members and wards. In other words, they are like our heroes and mentors who can guide us from the darkness of fear, militancy, corruption and other dark sides of life and so on. Now the question arises, if Gandhi would have been alive today, what would have been his reaction/opinion to the police and its functioning? Would he have some thing different in his mind now what he had been in his mind before the partition or would he be going to start some Satyagraha in the form of some improvement in the functioning of the police administration? Really these questions or rather night mares can come to any one’s mind, when there is too much confusion is prevailing in our minds, when there is too much corruption in the society and when the polices working is also in the questioning because of one or the other case throughout the India. It is matter of great concern that we have to thing over our administration and our practical approach because the police personals are also like us, they are part and parcel of our society and among one of us, so why we all are pin pointing towards them.
A STUDY ON TALENT MANAGEMENT AND ITS IMPACT ON EMPLOYEE RETENTION IN SELECTED...IAEME Publication
The goal of this study was to see how talent management affected employee retention in the selected IT organizations in Chennai. The fundamental issue was the difficulty to attract, hire, and retain talented personnel who perform well and the gap between supply and demand of talent acquisition and retaining them within the firms. The study's main goals were to determine the impact of talent management on employee retention in IT companies in Chennai, investigate talent management strategies that IT companies could use to improve talent acquisition, performance management, career planning and formulate retention strategies that the IT firms could use. The respondents were given a structured close-ended questionnaire with the 5 Point Likert Scale as part of the study's quantitative research design. The target population consisted of 289 IT professionals. The questionnaires were distributed and collected by the researcher directly. The Statistical Package for Social Sciences (SPSS) was used to collect and analyse the questionnaire responses. Hypotheses that were formulated for the various areas of the study were tested using a variety of statistical tests. The key findings of the study suggested that talent management had an impact on employee retention. The studies also found that there is a clear link between the implementation of talent management and retention measures. Management should provide enough training and development for employees, clarify job responsibilities, provide adequate remuneration packages, and recognise employees for exceptional performance.
ATTRITION IN THE IT INDUSTRY DURING COVID-19 PANDEMIC: LINKING EMOTIONAL INTE...IAEME Publication
Globally, Millions of dollars were spent by the organizations for employing skilled Information Technology (IT) professionals. It is costly to replace unskilled employees with IT professionals possessing technical skills and competencies that aid in interconnecting the business processes. The organization’s employment tactics were forced to alter by globalization along with technological innovations as they consistently diminish to remain lean, outsource to concentrate on core competencies along with restructuring/reallocate personnel to gather efficiency. As other jobs, organizations or professions have become reasonably more appropriate in a shifting employment landscape, the above alterations trigger both involuntary as well as voluntary turnover. The employee view on jobs is also afflicted by the COVID-19 pandemic along with the employee-driven labour market. So, having effective strategies is necessary to tackle the withdrawal rate of employees. By associating Emotional Intelligence (EI) along with Talent Management (TM) in the IT industry, the rise in attrition rate was analyzed in this study. Only 303 respondents were collected out of 350 participants to whom questionnaires were distributed. From the employees of IT organizations located in Bangalore (India), the data were congregated. A simple random sampling methodology was employed to congregate data as of the respondents. Generating the hypothesis along with testing is eventuated. The effect of EI and TM along with regression analysis between TM and EI was analyzed. The outcomes indicated that employee and Organizational Performance (OP) were elevated by effective EI along with TM.
INFLUENCE OF TALENT MANAGEMENT PRACTICES ON ORGANIZATIONAL PERFORMANCE A STUD...IAEME Publication
By implementing talent management strategy, organizations would have the option to retain their skilled professionals while additionally working on their overall performance. It is the course of appropriately utilizing the ideal individuals, setting them up for future top positions, exploring and dealing with their performance, and holding them back from leaving the organization. It is employee performance that determines the success of every organization. The firm quickly obtains an upper hand over its rivals in the event that its employees having particular skills that cannot be duplicated by the competitors. Thus, firms are centred on creating successful talent management practices and processes to deal with the unique human resources. Firms are additionally endeavouring to keep their top/key staff since on the off chance that they leave; the whole store of information leaves the firm's hands. The study's objective was to determine the impact of talent management on organizational performance among the selected IT organizations in Chennai. The study recommends that talent management limitedly affects performance. On the off chance that this talent is appropriately management and implemented properly, organizations might benefit as much as possible from their maintained assets to support development and productivity, both monetarily and non-monetarily.
A STUDY OF VARIOUS TYPES OF LOANS OF SELECTED PUBLIC AND PRIVATE SECTOR BANKS...IAEME Publication
Banking regulations act of India, 1949 defines banking as “acceptance of deposits for the purpose of lending or investment from the public, repayment on demand or otherwise and withdrawable through cheques, drafts order or otherwise”, the major participants of the Indian financial system are commercial banks, the financial institution encompassing term lending institutions. Investments institutions, specialized financial institution and the state level development banks, non banking financial companies (NBFC) and other market intermediaries such has the stock brokers and money lenders are among the oldest of the certain variants of NBFC and the oldest market participants. The asset quality of banks is one of the most important indicators of their financial health. The Indian banking sector has been facing severe problems of increasing Non- Performing Assets (NPAs). The NPAs growth directly and indirectly affects the quality of assets and profitability of banks. It also shows the efficiency of banks credit risk management and the recovery effectiveness. NPA do not generate any income, whereas, the bank is required to make provisions for such as assets that why is a double edge weapon. This paper outlines the concept of quality of bank loans of different types like Housing, Agriculture and MSME loans in state Haryana of selected public and private sector banks. This study is highlighting problems associated with the role of commercial bank in financing Small and Medium Scale Enterprises (SME). The overall objective of the research was to assess the effect of the financing provisions existing for the setting up and operations of MSMEs in the country and to generate recommendations for more robust financing mechanisms for successful operation of the MSMEs, in turn understanding the impact of MSME loans on financial institutions due to NPA. There are many research conducted on the topic of Non- Performing Assets (NPA) Management, concerning particular bank, comparative study of public and private banks etc. In this paper the researcher is considering the aggregate data of selected public sector and private sector banks and attempts to compare the NPA of Housing, Agriculture and MSME loans in state Haryana of public and private sector banks. The tools used in the study are average and Anova test and variance. The findings reveal that NPA is common problem for both public and private sector banks and is associated with all types of loans either that is housing loans, agriculture loans and loans to SMES. NPAs of both public and private sector banks show the increasing trend. In 2010-11 GNPA of public and private sector were at same level it was 2% but after 2010-11 it increased in many fold and at present there is GNPA in some more than 15%. It shows the dark area of Indian banking sector.
EXPERIMENTAL STUDY OF MECHANICAL AND TRIBOLOGICAL RELATION OF NYLON/BaSO4 POL...IAEME Publication
An experiment conducted in this study found that BaSO4 changed Nylon 6's mechanical properties. By changing the weight ratios, BaSO4 was used to make Nylon 6. This Researcher looked into how hard Nylon-6/BaSO4 composites are and how well they wear. Experiments were done based on Taguchi design L9. Nylon-6/BaSO4 composites can be tested for their hardness number using a Rockwell hardness testing apparatus. On Nylon/BaSO4, the wear behavior was measured by a wear monitor, pinon-disc friction by varying reinforcement, sliding speed, and sliding distance, and the microstructure of the crack surfaces was observed by SEM. This study provides significant contributions to ultimate strength by increasing BaSO4 content up to 16% in the composites, and sliding speed contributes 72.45% to the wear rate
ROLE OF SOCIAL ENTREPRENEURSHIP IN RURAL DEVELOPMENT OF INDIA - PROBLEMS AND ...IAEME Publication
The majority of the population in India lives in villages. The village is the back bone of the country. Village or rural industries play an important role in the national economy, particularly in the rural development. Developing the rural economy is one of the key indicators towards a country’s success. Whether it be the need to look after the welfare of the farmers or invest in rural infrastructure, Governments have to ensure that rural development isn’t compromised. The economic development of our country largely depends on the progress of rural areas and the standard of living of rural masses. Village or rural industries play an important role in the national economy, particularly in the rural development. Rural entrepreneurship is based on stimulating local entrepreneurial talent and the subsequent growth of indigenous enterprises. It recognizes opportunity in the rural areas and accelerates a unique blend of resources either inside or outside of agriculture. Rural entrepreneurship brings an economic value to the rural sector by creating new methods of production, new markets, new products and generate employment opportunities thereby ensuring continuous rural development. Social Entrepreneurship has the direct and primary objective of serving the society along with the earning profits. So, social entrepreneurship is different from the economic entrepreneurship as its basic objective is not to earn profits but for providing innovative solutions to meet the society needs which are not taken care by majority of the entrepreneurs as they are in the business for profit making as a sole objective. So, the Social Entrepreneurs have the huge growth potential particularly in the developing countries like India where we have huge societal disparities in terms of the financial positions of the population. Still 22 percent of the Indian population is below the poverty line and also there is disparity among the rural & urban population in terms of families living under BPL. 25.7 percent of the rural population & 13.7 percent of the urban population is under BPL which clearly shows the disparity of the poor people in the rural and urban areas. The need to develop social entrepreneurship in agriculture is dictated by a large number of social problems. Such problems include low living standards, unemployment, and social tension. The reasons that led to the emergence of the practice of social entrepreneurship are the above factors. The research problem lays upon disclosing the importance of role of social entrepreneurship in rural development of India. The paper the tendencies of social entrepreneurship in India, to present successful examples of such business for providing recommendations how to improve situation in rural areas in terms of social entrepreneurship development. Indian government has made some steps towards development of social enterprises, social entrepreneurship, and social in- novation, but a lot remains to be improved.
OPTIMAL RECONFIGURATION OF POWER DISTRIBUTION RADIAL NETWORK USING HYBRID MET...IAEME Publication
Distribution system is a critical link between the electric power distributor and the consumers. Most of the distribution networks commonly used by the electric utility is the radial distribution network. However in this type of network, it has technical issues such as enormous power losses which affect the quality of the supply. Nowadays, the introduction of Distributed Generation (DG) units in the system help improve and support the voltage profile of the network as well as the performance of the system components through power loss mitigation. In this study network reconfiguration was done using two meta-heuristic algorithms Particle Swarm Optimization and Gravitational Search Algorithm (PSO-GSA) to enhance power quality and voltage profile in the system when simultaneously applied with the DG units. Backward/Forward Sweep Method was used in the load flow analysis and simulated using the MATLAB program. Five cases were considered in the Reconfiguration based on the contribution of DG units. The proposed method was tested using IEEE 33 bus system. Based on the results, there was a voltage profile improvement in the system from 0.9038 p.u. to 0.9594 p.u.. The integration of DG in the network also reduced power losses from 210.98 kW to 69.3963 kW. Simulated results are drawn to show the performance of each case.
APPLICATION OF FRUGAL APPROACH FOR PRODUCTIVITY IMPROVEMENT - A CASE STUDY OF...IAEME Publication
Manufacturing industries have witnessed an outburst in productivity. For productivity improvement manufacturing industries are taking various initiatives by using lean tools and techniques. However, in different manufacturing industries, frugal approach is applied in product design and services as a tool for improvement. Frugal approach contributed to prove less is more and seems indirectly contributing to improve productivity. Hence, there is need to understand status of frugal approach application in manufacturing industries. All manufacturing industries are trying hard and putting continuous efforts for competitive existence. For productivity improvements, manufacturing industries are coming up with different effective and efficient solutions in manufacturing processes and operations. To overcome current challenges, manufacturing industries have started using frugal approach in product design and services. For this study, methodology adopted with both primary and secondary sources of data. For primary source interview and observation technique is used and for secondary source review has done based on available literatures in website, printed magazines, manual etc. An attempt has made for understanding application of frugal approach with the study of manufacturing industry project. Manufacturing industry selected for this project study is Mahindra and Mahindra Ltd. This paper will help researcher to find the connections between the two concepts productivity improvement and frugal approach. This paper will help to understand significance of frugal approach for productivity improvement in manufacturing industry. This will also help to understand current scenario of frugal approach in manufacturing industry. In manufacturing industries various process are involved to deliver the final product. In the process of converting input in to output through manufacturing process productivity plays very critical role. Hence this study will help to evolve status of frugal approach in productivity improvement programme. The notion of frugal can be viewed as an approach towards productivity improvement in manufacturing industries.
A MULTIPLE – CHANNEL QUEUING MODELS ON FUZZY ENVIRONMENTIAEME Publication
In this paper, we investigated a queuing model of fuzzy environment-based a multiple channel queuing model (M/M/C) ( /FCFS) and study its performance under realistic conditions. It applies a nonagonal fuzzy number to analyse the relevant performance of a multiple channel queuing model (M/M/C) ( /FCFS). Based on the sub interval average ranking method for nonagonal fuzzy number, we convert fuzzy number to crisp one. Numerical results reveal that the efficiency of this method. Intuitively, the fuzzy environment adapts well to a multiple channel queuing models (M/M/C) ( /FCFS) are very well.
Let's Integrate MuleSoft RPA, COMPOSER, APM with AWS IDP along with Slackshyamraj55
Discover the seamless integration of RPA (Robotic Process Automation), COMPOSER, and APM with AWS IDP enhanced with Slack notifications. Explore how these technologies converge to streamline workflows, optimize performance, and ensure secure access, all while leveraging the power of AWS IDP and real-time communication via Slack notifications.
Why You Should Replace Windows 11 with Nitrux Linux 3.5.0 for enhanced perfor...SOFTTECHHUB
The choice of an operating system plays a pivotal role in shaping our computing experience. For decades, Microsoft's Windows has dominated the market, offering a familiar and widely adopted platform for personal and professional use. However, as technological advancements continue to push the boundaries of innovation, alternative operating systems have emerged, challenging the status quo and offering users a fresh perspective on computing.
One such alternative that has garnered significant attention and acclaim is Nitrux Linux 3.5.0, a sleek, powerful, and user-friendly Linux distribution that promises to redefine the way we interact with our devices. With its focus on performance, security, and customization, Nitrux Linux presents a compelling case for those seeking to break free from the constraints of proprietary software and embrace the freedom and flexibility of open-source computing.
Unlock the Future of Search with MongoDB Atlas_ Vector Search Unleashed.pdfMalak Abu Hammad
Discover how MongoDB Atlas and vector search technology can revolutionize your application's search capabilities. This comprehensive presentation covers:
* What is Vector Search?
* Importance and benefits of vector search
* Practical use cases across various industries
* Step-by-step implementation guide
* Live demos with code snippets
* Enhancing LLM capabilities with vector search
* Best practices and optimization strategies
Perfect for developers, AI enthusiasts, and tech leaders. Learn how to leverage MongoDB Atlas to deliver highly relevant, context-aware search results, transforming your data retrieval process. Stay ahead in tech innovation and maximize the potential of your applications.
#MongoDB #VectorSearch #AI #SemanticSearch #TechInnovation #DataScience #LLM #MachineLearning #SearchTechnology
Climate Impact of Software Testing at Nordic Testing DaysKari Kakkonen
My slides at Nordic Testing Days 6.6.2024
Climate impact / sustainability of software testing discussed on the talk. ICT and testing must carry their part of global responsibility to help with the climat warming. We can minimize the carbon footprint but we can also have a carbon handprint, a positive impact on the climate. Quality characteristics can be added with sustainability, and then measured continuously. Test environments can be used less, and in smaller scale and on demand. Test techniques can be used in optimizing or minimizing number of tests. Test automation can be used to speed up testing.
Threats to mobile devices are more prevalent and increasing in scope and complexity. Users of mobile devices desire to take full advantage of the features
available on those devices, but many of the features provide convenience and capability but sacrifice security. This best practices guide outlines steps the users can take to better protect personal devices and information.
Pushing the limits of ePRTC: 100ns holdover for 100 daysAdtran
At WSTS 2024, Alon Stern explored the topic of parametric holdover and explained how recent research findings can be implemented in real-world PNT networks to achieve 100 nanoseconds of accuracy for up to 100 days.
HCL Notes and Domino License Cost Reduction in the World of DLAUpanagenda
Webinar Recording: https://www.panagenda.com/webinars/hcl-notes-and-domino-license-cost-reduction-in-the-world-of-dlau/
The introduction of DLAU and the CCB & CCX licensing model caused quite a stir in the HCL community. As a Notes and Domino customer, you may have faced challenges with unexpected user counts and license costs. You probably have questions on how this new licensing approach works and how to benefit from it. Most importantly, you likely have budget constraints and want to save money where possible. Don’t worry, we can help with all of this!
We’ll show you how to fix common misconfigurations that cause higher-than-expected user counts, and how to identify accounts which you can deactivate to save money. There are also frequent patterns that can cause unnecessary cost, like using a person document instead of a mail-in for shared mailboxes. We’ll provide examples and solutions for those as well. And naturally we’ll explain the new licensing model.
Join HCL Ambassador Marc Thomas in this webinar with a special guest appearance from Franz Walder. It will give you the tools and know-how to stay on top of what is going on with Domino licensing. You will be able lower your cost through an optimized configuration and keep it low going forward.
These topics will be covered
- Reducing license cost by finding and fixing misconfigurations and superfluous accounts
- How do CCB and CCX licenses really work?
- Understanding the DLAU tool and how to best utilize it
- Tips for common problem areas, like team mailboxes, functional/test users, etc
- Practical examples and best practices to implement right away
Dr. Sean Tan, Head of Data Science, Changi Airport Group
Discover how Changi Airport Group (CAG) leverages graph technologies and generative AI to revolutionize their search capabilities. This session delves into the unique search needs of CAG’s diverse passengers and customers, showcasing how graph data structures enhance the accuracy and relevance of AI-generated search results, mitigating the risk of “hallucinations” and improving the overall customer journey.
Removing Uninteresting Bytes in Software FuzzingAftab Hussain
Imagine a world where software fuzzing, the process of mutating bytes in test seeds to uncover hidden and erroneous program behaviors, becomes faster and more effective. A lot depends on the initial seeds, which can significantly dictate the trajectory of a fuzzing campaign, particularly in terms of how long it takes to uncover interesting behaviour in your code. We introduce DIAR, a technique designed to speedup fuzzing campaigns by pinpointing and eliminating those uninteresting bytes in the seeds. Picture this: instead of wasting valuable resources on meaningless mutations in large, bloated seeds, DIAR removes the unnecessary bytes, streamlining the entire process.
In this work, we equipped AFL, a popular fuzzer, with DIAR and examined two critical Linux libraries -- Libxml's xmllint, a tool for parsing xml documents, and Binutil's readelf, an essential debugging and security analysis command-line tool used to display detailed information about ELF (Executable and Linkable Format). Our preliminary results show that AFL+DIAR does not only discover new paths more quickly but also achieves higher coverage overall. This work thus showcases how starting with lean and optimized seeds can lead to faster, more comprehensive fuzzing campaigns -- and DIAR helps you find such seeds.
- These are slides of the talk given at IEEE International Conference on Software Testing Verification and Validation Workshop, ICSTW 2022.
Building Production Ready Search Pipelines with Spark and MilvusZilliz
Spark is the widely used ETL tool for processing, indexing and ingesting data to serving stack for search. Milvus is the production-ready open-source vector database. In this talk we will show how to use Spark to process unstructured data to extract vector representations, and push the vectors to Milvus vector database for search serving.
Full-RAG: A modern architecture for hyper-personalizationZilliz
Mike Del Balso, CEO & Co-Founder at Tecton, presents "Full RAG," a novel approach to AI recommendation systems, aiming to push beyond the limitations of traditional models through a deep integration of contextual insights and real-time data, leveraging the Retrieval-Augmented Generation architecture. This talk will outline Full RAG's potential to significantly enhance personalization, address engineering challenges such as data management and model training, and introduce data enrichment with reranking as a key solution. Attendees will gain crucial insights into the importance of hyperpersonalization in AI, the capabilities of Full RAG for advanced personalization, and strategies for managing complex data integrations for deploying cutting-edge AI solutions.
Observability Concepts EVERY Developer Should Know -- DeveloperWeek Europe.pdfPaige Cruz
Monitoring and observability aren’t traditionally found in software curriculums and many of us cobble this knowledge together from whatever vendor or ecosystem we were first introduced to and whatever is a part of your current company’s observability stack.
While the dev and ops silo continues to crumble….many organizations still relegate monitoring & observability as the purview of ops, infra and SRE teams. This is a mistake - achieving a highly observable system requires collaboration up and down the stack.
I, a former op, would like to extend an invitation to all application developers to join the observability party will share these foundational concepts to build on:
UiPath Test Automation using UiPath Test Suite series, part 5DianaGray10
Welcome to UiPath Test Automation using UiPath Test Suite series part 5. In this session, we will cover CI/CD with devops.
Topics covered:
CI/CD with in UiPath
End-to-end overview of CI/CD pipeline with Azure devops
Speaker:
Lyndsey Byblow, Test Suite Sales Engineer @ UiPath, Inc.
5. (4)
The probe average heat transfer coefficient was estimated from the local heat transfer coefficients:
(5)
3. RESULTS AND DISCUSSION
3.1 Effect of air superficial velocity on heat transfer coefficient
Fig. 3 shows the effect of superficial gas velocity of 1.0, 1.25, 1.5, 1.75 m/s on the surface-to-bed
heat transfer coefficient in the fluidized column at heat fluxes of 1698.9, 2928.4, 4675.7 W m-2,
1.5 kg bed inventory and 301μm particles size. From the figure, it is noticed that the heat transfer
coefficient increased with increasing the fluidization velocity. The increase in heat transfer may be
due to enhanced turbulence in the column for higher velocity which in turn causes for intermixing of
solids and gas solid suspension.
7. 43
Fig. 2: Effect of gas superficial velocity on heat transfer coefficient at I=1.5 kg, dp=301μm and
three different heat fluxes
3.2 Effect of bed inventories on heat transfer coefficient
The effect of bed inventories on heat transfer coefficient can be shown in fig. 4. Inventory in
the bed was varied as 1.5, 2.0, and 2.5 kg. It is observed that increase in the inventory of sand in the
column increases the bed temperature and heat transfer coefficient. This is because sand particles
concentration increases with increase bed inventory. Consequently, more quantity of particles in the
lower splash region promotes more heat transfer through conduction because of which bulk
temperature of bed was observed to be higher than that of lower inventory. W/m2
Fig. 3: Effect of bed inventories on heat transfer coefficient at q=1698.9 W m-2, dp=301μm and four
different gas superficial velocities
Fig. 4: Effect of bed inventories on heat transfer coefficient at q=2928.4 W m-2, dp=301μm and four
different gas superficial velocities
h W/m2. oC
Ug m/s
q=1698.9 W m-2
q=2928.4 W m-2
q=4675.7 W m-2