The document studies and compares the rate of energy dissipation in stepped overflows before and after the hydraulic jump using laboratory models. It finds that using the depth of flow before the hydraulic jump (y1) overestimates energy dissipation compared to using the depth after the hydraulic jump (y2) and calculating y1, due to air bubbles in the flow before the jump. The study builds and tests a physical model of a stepped spillway. It measures depths before and after the hydraulic jump under different discharges and calculates energy dissipation rates using both methods. The results show greater errors in the calculation using y1 as discharge increases due to more air in the flow.
Effect of inclined hump on the turbulence intensities and flow characteristic...eSAT Journals
Abstract In this paper, an experimental study was carried out to investigate the turbulence field and flow characteristics in the separated flow through inclined hump in water structures in rectangular channel using Laser. To study the variation of the turbulence, energy loss, relative energy (efficiency) and relative depth with main parameters affecting the inclined hump These parameters include the hump angle, relative height, upstream Froude number, bottom slope. Non-dimensional design curves are provided to relate the turbulence intensities and flow characteristics. The results show that, the variation of the energy loss increases till of hump angle about 45°. This rate of increase decreases about this value of angle of hump. The energy loss increases with the increasing of bed slope and relative height. The energy loss is quite high at a relative contraction of 0.3. Also, the results clearly showed the dependence of the hump inclination angle on the turbulence intensities. For hump angle ≥ 20°, the turbulence intensity in the separation zones was growing with increasing hump angles and the maximum was observed for hump inclination angles between 20° and 30°. The results indicated that, the most significant differences in flow structures occurred with hump angle less than 45°. Keywords: Energy loss-Turbulence intensities-Water structures- Hump-Laser Technique-Hump angle-Bottom slope-Relative height-Relative depth- Froude number-separation zones.
Seismic Analysis and Optimization of RC Elevated Water Tank Using Various Sta...IJERA Editor
As known from very upsetting experiences, poorly designed elevated water tanks were heavily damaged or
collapsed during earthquakes. This might be due to the lack of knowledge regarding the behaviour of supporting
system of the tank, and also due to improper selection of geometry of staging patterns. For certain proportions of
the tank and the structure, the sloshing of the water during earthquake may be one of the dominant
factors.Dynamic analysis of tank containing liquid is complex involving fluid-structure interaction.In this paper,
the seismic behavioural effect of circular elevated water tank is studied for specific capacity of tank for various
staging arrangements in plan, variation in number of periphery columns and variation in number of stages in
elevation. Two mass idealizations suggested by Gujarat State Disaster Management Authority are considered
here. Under earthquake loads; a complicated pattern of stresses is generated in the tanks. Total 36 combinations
were analysedwith SAP2000 using Response Spectrum Method (RSM) and results are presented. It is observed
that increase in number of columns, does not assure the increase in the improvement of structural responses.
Radial arrangement with six staging levels is found to be best for the number of columns used. To suggest
number of columns with suitable diameter cost optimization is done for the radial staging arrangement with six
staging levels consideringcritical direction of seismic force, quantity of concrete and steel required. It is found
that eight numbers of columns gives less cost as compared to six, ten and twelve with optimized diameter of
300mm.
IJRET : International Journal of Research in Engineering and Technology is an international peer reviewed, online journal published by eSAT Publishing House for the enhancement of research in various disciplines of Engineering and Technology. The aim and scope of the journal is to provide an academic medium and an important reference for the advancement and dissemination of research results that support high-level learning, teaching and research in the fields of Engineering and Technology. We bring together Scientists, Academician, Field Engineers, Scholars and Students of related fields of Engineering and Technology
Manipulation of Water Hammer Problem by Modification of NRV ValveIDES Editor
Water hammer in piping systems produces large
dynamic forces which can damage the pipes and supports.
Therefore it is important to minimize the water hammer
effects on the piping system. In this work, a new method for
the reduction of water hammer by active measures is
described- that means the reduction of water hammer by
influencing the fluid dynamic conditions of the system. We
are concerned with the effects of the rapid valve closures in
pipes connected to wave reflection points. The energy is of
two kind’s Kinetic energy and Elastic energy. Both forms are
converted into pressure energy and the rapidity of the
conversion is of the utmost importance in terms of ensuring
damage that may result. Such energy dissipation in a
controlled non damaging way is discussed in this paper. The
latest outcomes of the research in this area are also discussed
with their failures in the implementation of these concepts in
industries, and the feasibility of our new method
Experimental Investigation on Impact of Jet on Vanes Pipe System to Determine...ijtsrd
The water coming out from the nozzle is called as a jet and when the impacted on the different surfaces and the change in momentum can be determined and the experiment is performed with the nozzle, different type of plates such as flat, Circular and semi circular and a spring scale connected to the balanced beam and different weights are used as counter weights, flow meter and pipes. In this paper during the experimentation of determining the coefficient of impact on the vanes plates some of the minor Losses occurred due to the presence of bend in the suction pipe and nozzle pipe line connectivity and the extra fitting such as valve to control the flow on the pipe are present, due to this the flow of water, velocity in the pipe are varied, an attempt is done with this experiment to determine some important minor losses ,major losses are neglected as length of pipe is short. The readings from the experiment on three different plates are conducted and readings are tabulated and compared. J Narendra Kumar | G Narasimhulu "Experimental Investigation on Impact of Jet on Vanes Pipe System to Determine the Minor Losses" Published in International Journal of Trend in Scientific Research and Development (ijtsrd), ISSN: 2456-6470, Volume-4 | Issue-6 , October 2020, URL: https://www.ijtsrd.com/papers/ijtsrd33507.pdf Paper Url: https://www.ijtsrd.com/engineering/mechanical-engineering/33507/experimental-investigation-on-impact-of-jet-on-vanes-pipe-system-to-determine-the-minor-losses/j-narendra-kumar
A Review on Comparison between Shell And Tube Heat Exchanger And Helical Coil...ijiert bestjournal
The curved shape of the tube causes the flowing fluid to experience centrifugal force. The
extent of centrifugal force experienced depends on the local axial velocity of the fluid particle
and radius of curvature of the coil. The fluid particles flowing at the core of the pipe have
higher velocities than those flowing near to the pipe wall. Thus the fluid particles flowing
close to the tube wall experience a lower centrifugal force than the fluid particles flowing in
the tube core. This causes the fluid from the core region to be pushed towards the outer wall.
This stream bifurcates at the wall and drives the fluid towards the inner wall along the tube
periphery, causing generation of counter-rotating vortices called secondary flows which
produce additional transport of the fluid over the cross section of the pipe. This additional
convective transport increases heat transfer and the pressure drop when compared to that in a
straight tube.
Use of hydraulic phenomena in enhancement of dissolved oxygen concentrationeSAT Journals
Abstract
The dissolved oxygen (DO) content of water bodies is an indicator of water quality and hence a measure of ability of water to sustain aquatic life. Hydraulic phenomena such as hydraulic drops and hydraulic jumps can increase the amount of DO in the water by creating turbulent conditions. The main reason for this oxygen transfer is the air entrainment into the flow through large number of air bubbles that helps in air-water transfer. The present study investigates the effect of different weir types and hydraulic jump on their aeration efficiency. Two types of weirs namely rectangular and triangular weirs were used in the study. Also, the hydraulic jump was studied as an aeration agent. From the experimental results, it was found that the triangular weir provides greater aeration efficiency of 0.1948 as compared with rectangular weir that had aeration efficiency of 0.1012. On the other hand, the hydraulic jump showed aeration efficiency of 0.14285. As the weirs are more efficient than hydraulic jump, they are most applicable in the field. Also, weir structures are less expensive when compared with the structural arrangement required for the formation of hydraulic jump.
Keywords: Dissolved oxygen, Aeration efficiency, Weir, Hydraulic jump
Effect of inclined hump on the turbulence intensities and flow characteristic...eSAT Journals
Abstract In this paper, an experimental study was carried out to investigate the turbulence field and flow characteristics in the separated flow through inclined hump in water structures in rectangular channel using Laser. To study the variation of the turbulence, energy loss, relative energy (efficiency) and relative depth with main parameters affecting the inclined hump These parameters include the hump angle, relative height, upstream Froude number, bottom slope. Non-dimensional design curves are provided to relate the turbulence intensities and flow characteristics. The results show that, the variation of the energy loss increases till of hump angle about 45°. This rate of increase decreases about this value of angle of hump. The energy loss increases with the increasing of bed slope and relative height. The energy loss is quite high at a relative contraction of 0.3. Also, the results clearly showed the dependence of the hump inclination angle on the turbulence intensities. For hump angle ≥ 20°, the turbulence intensity in the separation zones was growing with increasing hump angles and the maximum was observed for hump inclination angles between 20° and 30°. The results indicated that, the most significant differences in flow structures occurred with hump angle less than 45°. Keywords: Energy loss-Turbulence intensities-Water structures- Hump-Laser Technique-Hump angle-Bottom slope-Relative height-Relative depth- Froude number-separation zones.
Seismic Analysis and Optimization of RC Elevated Water Tank Using Various Sta...IJERA Editor
As known from very upsetting experiences, poorly designed elevated water tanks were heavily damaged or
collapsed during earthquakes. This might be due to the lack of knowledge regarding the behaviour of supporting
system of the tank, and also due to improper selection of geometry of staging patterns. For certain proportions of
the tank and the structure, the sloshing of the water during earthquake may be one of the dominant
factors.Dynamic analysis of tank containing liquid is complex involving fluid-structure interaction.In this paper,
the seismic behavioural effect of circular elevated water tank is studied for specific capacity of tank for various
staging arrangements in plan, variation in number of periphery columns and variation in number of stages in
elevation. Two mass idealizations suggested by Gujarat State Disaster Management Authority are considered
here. Under earthquake loads; a complicated pattern of stresses is generated in the tanks. Total 36 combinations
were analysedwith SAP2000 using Response Spectrum Method (RSM) and results are presented. It is observed
that increase in number of columns, does not assure the increase in the improvement of structural responses.
Radial arrangement with six staging levels is found to be best for the number of columns used. To suggest
number of columns with suitable diameter cost optimization is done for the radial staging arrangement with six
staging levels consideringcritical direction of seismic force, quantity of concrete and steel required. It is found
that eight numbers of columns gives less cost as compared to six, ten and twelve with optimized diameter of
300mm.
IJRET : International Journal of Research in Engineering and Technology is an international peer reviewed, online journal published by eSAT Publishing House for the enhancement of research in various disciplines of Engineering and Technology. The aim and scope of the journal is to provide an academic medium and an important reference for the advancement and dissemination of research results that support high-level learning, teaching and research in the fields of Engineering and Technology. We bring together Scientists, Academician, Field Engineers, Scholars and Students of related fields of Engineering and Technology
Manipulation of Water Hammer Problem by Modification of NRV ValveIDES Editor
Water hammer in piping systems produces large
dynamic forces which can damage the pipes and supports.
Therefore it is important to minimize the water hammer
effects on the piping system. In this work, a new method for
the reduction of water hammer by active measures is
described- that means the reduction of water hammer by
influencing the fluid dynamic conditions of the system. We
are concerned with the effects of the rapid valve closures in
pipes connected to wave reflection points. The energy is of
two kind’s Kinetic energy and Elastic energy. Both forms are
converted into pressure energy and the rapidity of the
conversion is of the utmost importance in terms of ensuring
damage that may result. Such energy dissipation in a
controlled non damaging way is discussed in this paper. The
latest outcomes of the research in this area are also discussed
with their failures in the implementation of these concepts in
industries, and the feasibility of our new method
Experimental Investigation on Impact of Jet on Vanes Pipe System to Determine...ijtsrd
The water coming out from the nozzle is called as a jet and when the impacted on the different surfaces and the change in momentum can be determined and the experiment is performed with the nozzle, different type of plates such as flat, Circular and semi circular and a spring scale connected to the balanced beam and different weights are used as counter weights, flow meter and pipes. In this paper during the experimentation of determining the coefficient of impact on the vanes plates some of the minor Losses occurred due to the presence of bend in the suction pipe and nozzle pipe line connectivity and the extra fitting such as valve to control the flow on the pipe are present, due to this the flow of water, velocity in the pipe are varied, an attempt is done with this experiment to determine some important minor losses ,major losses are neglected as length of pipe is short. The readings from the experiment on three different plates are conducted and readings are tabulated and compared. J Narendra Kumar | G Narasimhulu "Experimental Investigation on Impact of Jet on Vanes Pipe System to Determine the Minor Losses" Published in International Journal of Trend in Scientific Research and Development (ijtsrd), ISSN: 2456-6470, Volume-4 | Issue-6 , October 2020, URL: https://www.ijtsrd.com/papers/ijtsrd33507.pdf Paper Url: https://www.ijtsrd.com/engineering/mechanical-engineering/33507/experimental-investigation-on-impact-of-jet-on-vanes-pipe-system-to-determine-the-minor-losses/j-narendra-kumar
A Review on Comparison between Shell And Tube Heat Exchanger And Helical Coil...ijiert bestjournal
The curved shape of the tube causes the flowing fluid to experience centrifugal force. The
extent of centrifugal force experienced depends on the local axial velocity of the fluid particle
and radius of curvature of the coil. The fluid particles flowing at the core of the pipe have
higher velocities than those flowing near to the pipe wall. Thus the fluid particles flowing
close to the tube wall experience a lower centrifugal force than the fluid particles flowing in
the tube core. This causes the fluid from the core region to be pushed towards the outer wall.
This stream bifurcates at the wall and drives the fluid towards the inner wall along the tube
periphery, causing generation of counter-rotating vortices called secondary flows which
produce additional transport of the fluid over the cross section of the pipe. This additional
convective transport increases heat transfer and the pressure drop when compared to that in a
straight tube.
Use of hydraulic phenomena in enhancement of dissolved oxygen concentrationeSAT Journals
Abstract
The dissolved oxygen (DO) content of water bodies is an indicator of water quality and hence a measure of ability of water to sustain aquatic life. Hydraulic phenomena such as hydraulic drops and hydraulic jumps can increase the amount of DO in the water by creating turbulent conditions. The main reason for this oxygen transfer is the air entrainment into the flow through large number of air bubbles that helps in air-water transfer. The present study investigates the effect of different weir types and hydraulic jump on their aeration efficiency. Two types of weirs namely rectangular and triangular weirs were used in the study. Also, the hydraulic jump was studied as an aeration agent. From the experimental results, it was found that the triangular weir provides greater aeration efficiency of 0.1948 as compared with rectangular weir that had aeration efficiency of 0.1012. On the other hand, the hydraulic jump showed aeration efficiency of 0.14285. As the weirs are more efficient than hydraulic jump, they are most applicable in the field. Also, weir structures are less expensive when compared with the structural arrangement required for the formation of hydraulic jump.
Keywords: Dissolved oxygen, Aeration efficiency, Weir, Hydraulic jump
Vortex Tube Usage in Cooling and Liquification Process of Excess Gases in Ghe...Samet Baykul
DATE: 2019.05
- Computational analysis of a vortex tube
- Developing boundary conditions for heat transfer analysis
- CAD by creating a suitable model for heat transfer analysis
- CFD analysis by using ANSYS FLUENT
- Literature survey for recent academic studies
ABSTRACT:
Vortex tubes are simple and common devices which separates a high-pressure gas flow as two different lower gas flows. One of the outlets has a higher temperature than the inlet high pressure gas and other outlet has lower. Most common types of the vortex tubes are counter and parallel flow types. In counter flow type vortex tubes the cold and hot outlets are on opposite sides and in parallel flow type both the outlets are on the same side. Since it is a simple, well known, compact, portable, highly reliable and has a few initial costs, it could be desirable for the specific heating or cooling and refrigeration applications.
Seismic behavior of elevated water tankeSAT Journals
Abstract Hydrodynamic analysis of elevated water tank is a complex procedure involving fluid structure interaction. The elevated tank supports large water mass at the top of slender staging. In case of elevated tank the resistance against lateral forces exerted by earthquake is largely dependent of supporting system. Staging is considered to be a critical element as far as lateral resistance is concern. Satisfactory performance of staging during strong ground shaking is crucial. In this paper seismic behavior of elevated water tank in view point of their supporting system is evaluated using finite element software ETABS. The main objective is to evaluate a performance of different staging system for elevated water tank using finite element software ETABS. The spring mass model consisting of impulsive and convective masses as per IS 1893:2002 Part 2 has been used for the analysis. The parametric study is performed on mathematical model with different staging system to evaluate their performance with regard to lateral stiffness, displacement, time period, seismic base shear, overturning moment, flexure etc. Keywords: Hydrodynamic analysis, Staging Performance, spring mass model, ETABS
Seismic behavior of rc elevated water tankunder different types of staging pa...CADmantra Technologies
CADmantra Technologies Pvt. Ltd. is one of the best Cad training company in northern zone in India . which are provided many types of courses in cad field i.e AUTOCAD,SOLIDWORK,CATIA,CRE-O,Uniraphics-NX, CNC, REVIT, STAAD.Pro. And many courses
Contact: www.cadmantra.com
www.cadmantra.blogspot.com
www.cadmantra.wix.com
Magneto-Convection of Immiscible Fluids in a Vertical Channel Using Robin Bou...IJERA Editor
The effects of viscous dissipation on fully developed two fluid magnetohydrodynamic flow in the presence of
constant electric field in a vertical channel is investigated using Robin boundary conditions. The fluids in both
the regions are incompressible, electrically conducting and the transport properties are assumed to be constant.
The plate exchanges heat with an external fluid. Both conditions of equal and different reference temperatures of
the external fluid are considered. First, the simple cases of the negligible Brinkman number or the negligible
Grashof number are solved analytically. Then, the combined effects of buoyancy forces and viscous dissipation
are analyzed by a perturbation series method valid for small values of perturbation parameter. To relax the
condition on the perturbation parameter, the flow fields are solved by using the differential transform method.
The results are presented graphically for different values of the mixed convection parameter, Hartman number,
perturbation parameter, viscosity ratio, width ratio, conductivity ratio and Biot numbers for both open and short
circuit. The effects of these parameters on the Nusselt number at the walls is also drawn. It is found that the
solutions obtained by perturbation method and differential transform method agree very well for small values of
perturbation parameter.
HYDRAULIC JUMP CHARACTERISTICS FOR DIFFERENT OPEN CHANNEL AND STILLING BASIN ...IAEME Publication
Hydraulic jump is considered as the best way for dissipating energy present in moving water downstream of hydraulic structures. This paper conducted laboratory experiments to investigate the hydraulic jump characteristics variations for different rectangular open channel layouts. In this paper, the used open channel layouts were five bed slopes of 0.0175, 0.0349, 0.0524, 0.0699, and 0.0875, and a sill with three different heights was placed along a model of the stilling basin at three different longitudinal distances. The characteristics of the hydraulic jump, which was formed downstream vertical gate, were measured for variable discharges.
Vortex Tube Usage in Cooling and Liquification Process of Excess Gases in Ghe...Samet Baykul
DATE: 2019.05
- Computational analysis of a vortex tube
- Developing boundary conditions for heat transfer analysis
- CAD by creating a suitable model for heat transfer analysis
- CFD analysis by using ANSYS FLUENT
- Literature survey for recent academic studies
ABSTRACT:
Vortex tubes are simple and common devices which separates a high-pressure gas flow as two different lower gas flows. One of the outlets has a higher temperature than the inlet high pressure gas and other outlet has lower. Most common types of the vortex tubes are counter and parallel flow types. In counter flow type vortex tubes the cold and hot outlets are on opposite sides and in parallel flow type both the outlets are on the same side. Since it is a simple, well known, compact, portable, highly reliable and has a few initial costs, it could be desirable for the specific heating or cooling and refrigeration applications.
Seismic behavior of elevated water tankeSAT Journals
Abstract Hydrodynamic analysis of elevated water tank is a complex procedure involving fluid structure interaction. The elevated tank supports large water mass at the top of slender staging. In case of elevated tank the resistance against lateral forces exerted by earthquake is largely dependent of supporting system. Staging is considered to be a critical element as far as lateral resistance is concern. Satisfactory performance of staging during strong ground shaking is crucial. In this paper seismic behavior of elevated water tank in view point of their supporting system is evaluated using finite element software ETABS. The main objective is to evaluate a performance of different staging system for elevated water tank using finite element software ETABS. The spring mass model consisting of impulsive and convective masses as per IS 1893:2002 Part 2 has been used for the analysis. The parametric study is performed on mathematical model with different staging system to evaluate their performance with regard to lateral stiffness, displacement, time period, seismic base shear, overturning moment, flexure etc. Keywords: Hydrodynamic analysis, Staging Performance, spring mass model, ETABS
Seismic behavior of rc elevated water tankunder different types of staging pa...CADmantra Technologies
CADmantra Technologies Pvt. Ltd. is one of the best Cad training company in northern zone in India . which are provided many types of courses in cad field i.e AUTOCAD,SOLIDWORK,CATIA,CRE-O,Uniraphics-NX, CNC, REVIT, STAAD.Pro. And many courses
Contact: www.cadmantra.com
www.cadmantra.blogspot.com
www.cadmantra.wix.com
Magneto-Convection of Immiscible Fluids in a Vertical Channel Using Robin Bou...IJERA Editor
The effects of viscous dissipation on fully developed two fluid magnetohydrodynamic flow in the presence of
constant electric field in a vertical channel is investigated using Robin boundary conditions. The fluids in both
the regions are incompressible, electrically conducting and the transport properties are assumed to be constant.
The plate exchanges heat with an external fluid. Both conditions of equal and different reference temperatures of
the external fluid are considered. First, the simple cases of the negligible Brinkman number or the negligible
Grashof number are solved analytically. Then, the combined effects of buoyancy forces and viscous dissipation
are analyzed by a perturbation series method valid for small values of perturbation parameter. To relax the
condition on the perturbation parameter, the flow fields are solved by using the differential transform method.
The results are presented graphically for different values of the mixed convection parameter, Hartman number,
perturbation parameter, viscosity ratio, width ratio, conductivity ratio and Biot numbers for both open and short
circuit. The effects of these parameters on the Nusselt number at the walls is also drawn. It is found that the
solutions obtained by perturbation method and differential transform method agree very well for small values of
perturbation parameter.
HYDRAULIC JUMP CHARACTERISTICS FOR DIFFERENT OPEN CHANNEL AND STILLING BASIN ...IAEME Publication
Hydraulic jump is considered as the best way for dissipating energy present in moving water downstream of hydraulic structures. This paper conducted laboratory experiments to investigate the hydraulic jump characteristics variations for different rectangular open channel layouts. In this paper, the used open channel layouts were five bed slopes of 0.0175, 0.0349, 0.0524, 0.0699, and 0.0875, and a sill with three different heights was placed along a model of the stilling basin at three different longitudinal distances. The characteristics of the hydraulic jump, which was formed downstream vertical gate, were measured for variable discharges.
Energy Dissipation Regimes and Stability of the Overflow Dam (Spillway) for t...IRJESJOURNAL
Abstract: This paper evaluates the efficiency of energy dissipation of the spillway for the Mekin Dam with respect to its capacity by verifying that the flow down the spillway does not result in „transitional flow‟ which can induce vibrations dangerous to the structure. It also verifies the stability of the spillway by calculating the resulting safety coefficients at different times.
International Journal of Engineering Research and Development is an international premier peer reviewed open access engineering and technology journal promoting the discovery, innovation, advancement and dissemination of basic and transitional knowledge in engineering, technology and related disciplines.
We follow "Rigorous Publication" model - means that all articles appear on IJERD after full appraisal, effectiveness, legitimacy and reliability of research content. International Journal of Engineering Research and Development publishes papers online as well as provide hard copy of Journal to authors after publication of paper. It is intended to serve as a forum for researchers, practitioners and developers to exchange ideas and results for the advancement of Engineering & Technology.
IJRET : International Journal of Research in Engineering and Technology is an international peer reviewed, online journal published by eSAT Publishing House for the enhancement of research in various disciplines of Engineering and Technology. The aim and scope of the journal is to provide an academic medium and an important reference for the advancement and dissemination of research results that support high-level learning, teaching and research in the fields of Engineering and Technology. We bring together Scientists, Academician, Field Engineers, Scholars and Students of related fields of Engineering and TechnologyIJRET : International Journal of Research in Engineering and Technology is an international peer reviewed, online journal published by eSAT Publishing House for the enhancement of research in various disciplines of Engineering and Technology. The aim and scope of the journal is to provide an academic medium and an important reference for the advancement and dissemination of research results that support high-level learning, teaching and research in the fields of Engineering and Technology. We bring together Scientists, Academician, Field Engineers, Scholars and Students of related fields of Engineering and Technology
Comparison of flow analysis of a sudden and gradual change of pipe diameter u...eSAT Journals
Abstract This paper describes an analytical approach to describe the areas where Pipes (used for flow of fluids) are mostly susceptible to damage and tries to visualize the flow behaviour in various geometric conditions of a pipe. Fluent software was used to plot the characteristics of the flow and gambit software was used to design the 2D model. Two phase Computational fluid dynamics calculations, using K-epsilon model were employed. This simulation gives the values of pressure and velocity contours at various sections of the pipe in which water as a media. A comparison was made with the sudden and gradual change of pipe diameter (i.e., expansion and contraction of the pipe). The numerical results were validated against experimental data from the literature and were found to be in good agreement. Index Terms: gambit, fluent software.
International Journal of Computational Engineering Research(IJCER)ijceronline
International Journal of Computational Engineering Research(IJCER) is an intentional online Journal in English monthly publishing journal. This Journal publish original research work that contributes significantly to further the scientific knowledge in engineering and Technology
Securing your Kubernetes cluster_ a step-by-step guide to success !KatiaHIMEUR1
Today, after several years of existence, an extremely active community and an ultra-dynamic ecosystem, Kubernetes has established itself as the de facto standard in container orchestration. Thanks to a wide range of managed services, it has never been so easy to set up a ready-to-use Kubernetes cluster.
However, this ease of use means that the subject of security in Kubernetes is often left for later, or even neglected. This exposes companies to significant risks.
In this talk, I'll show you step-by-step how to secure your Kubernetes cluster for greater peace of mind and reliability.
JMeter webinar - integration with InfluxDB and GrafanaRTTS
Watch this recorded webinar about real-time monitoring of application performance. See how to integrate Apache JMeter, the open-source leader in performance testing, with InfluxDB, the open-source time-series database, and Grafana, the open-source analytics and visualization application.
In this webinar, we will review the benefits of leveraging InfluxDB and Grafana when executing load tests and demonstrate how these tools are used to visualize performance metrics.
Length: 30 minutes
Session Overview
-------------------------------------------
During this webinar, we will cover the following topics while demonstrating the integrations of JMeter, InfluxDB and Grafana:
- What out-of-the-box solutions are available for real-time monitoring JMeter tests?
- What are the benefits of integrating InfluxDB and Grafana into the load testing stack?
- Which features are provided by Grafana?
- Demonstration of InfluxDB and Grafana using a practice web application
To view the webinar recording, go to:
https://www.rttsweb.com/jmeter-integration-webinar
Kubernetes & AI - Beauty and the Beast !?! @KCD Istanbul 2024Tobias Schneck
As AI technology is pushing into IT I was wondering myself, as an “infrastructure container kubernetes guy”, how get this fancy AI technology get managed from an infrastructure operational view? Is it possible to apply our lovely cloud native principals as well? What benefit’s both technologies could bring to each other?
Let me take this questions and provide you a short journey through existing deployment models and use cases for AI software. On practical examples, we discuss what cloud/on-premise strategy we may need for applying it to our own infrastructure to get it to work from an enterprise perspective. I want to give an overview about infrastructure requirements and technologies, what could be beneficial or limiting your AI use cases in an enterprise environment. An interactive Demo will give you some insides, what approaches I got already working for real.
Key Trends Shaping the Future of Infrastructure.pdfCheryl Hung
Keynote at DIGIT West Expo, Glasgow on 29 May 2024.
Cheryl Hung, ochery.com
Sr Director, Infrastructure Ecosystem, Arm.
The key trends across hardware, cloud and open-source; exploring how these areas are likely to mature and develop over the short and long-term, and then considering how organisations can position themselves to adapt and thrive.
DevOps and Testing slides at DASA ConnectKari Kakkonen
My and Rik Marselis slides at 30.5.2024 DASA Connect conference. We discuss about what is testing, then what is agile testing and finally what is Testing in DevOps. Finally we had lovely workshop with the participants trying to find out different ways to think about quality and testing in different parts of the DevOps infinity loop.
The Art of the Pitch: WordPress Relationships and SalesLaura Byrne
Clients don’t know what they don’t know. What web solutions are right for them? How does WordPress come into the picture? How do you make sure you understand scope and timeline? What do you do if sometime changes?
All these questions and more will be explored as we talk about matching clients’ needs with what your agency offers without pulling teeth or pulling your hair out. Practical tips, and strategies for successful relationship building that leads to closing the deal.
Software Delivery At the Speed of AI: Inflectra Invests In AI-Powered QualityInflectra
In this insightful webinar, Inflectra explores how artificial intelligence (AI) is transforming software development and testing. Discover how AI-powered tools are revolutionizing every stage of the software development lifecycle (SDLC), from design and prototyping to testing, deployment, and monitoring.
Learn about:
• The Future of Testing: How AI is shifting testing towards verification, analysis, and higher-level skills, while reducing repetitive tasks.
• Test Automation: How AI-powered test case generation, optimization, and self-healing tests are making testing more efficient and effective.
• Visual Testing: Explore the emerging capabilities of AI in visual testing and how it's set to revolutionize UI verification.
• Inflectra's AI Solutions: See demonstrations of Inflectra's cutting-edge AI tools like the ChatGPT plugin and Azure Open AI platform, designed to streamline your testing process.
Whether you're a developer, tester, or QA professional, this webinar will give you valuable insights into how AI is shaping the future of software delivery.
Dev Dives: Train smarter, not harder – active learning and UiPath LLMs for do...UiPathCommunity
💥 Speed, accuracy, and scaling – discover the superpowers of GenAI in action with UiPath Document Understanding and Communications Mining™:
See how to accelerate model training and optimize model performance with active learning
Learn about the latest enhancements to out-of-the-box document processing – with little to no training required
Get an exclusive demo of the new family of UiPath LLMs – GenAI models specialized for processing different types of documents and messages
This is a hands-on session specifically designed for automation developers and AI enthusiasts seeking to enhance their knowledge in leveraging the latest intelligent document processing capabilities offered by UiPath.
Speakers:
👨🏫 Andras Palfi, Senior Product Manager, UiPath
👩🏫 Lenka Dulovicova, Product Program Manager, UiPath
Smart TV Buyer Insights Survey 2024 by 91mobiles.pdf91mobiles
91mobiles recently conducted a Smart TV Buyer Insights Survey in which we asked over 3,000 respondents about the TV they own, aspects they look at on a new TV, and their TV buying preferences.
Smart TV Buyer Insights Survey 2024 by 91mobiles.pdf
E04653033
1. IOSR Journal of Engineering (IOSRJEN) www.iosrjen.org
ISSN (e): 2250-3021, ISSN (p): 2278-8719
Vol. 04, Issue 06 (June. 2014), ||V5|| PP 30-33
International organization of Scientific Research 30 | P a g e
Study and comparison of the rate of energy dissipation in stepped
overflows before and after hydraulic jump using laboratory
model
Moussa Rassaei1
, Sedigheh Rahbar2
1
Islamic Azad University Dehdasht branch, Iran
2
Islamic Azad University yasuj branch, Iran
Abstract: - The Stepped spillway consists of steps that starts of near spillway crest and continues downstream
heels The use of a stepped spillway, has been common since ancient times. But because of the significant impact
of steps, on the energy dissipation flow, in recent years, due to this type of Spillways has been greater Also,
understanding new technologies, use of Materials, Roller compact Concrete and consistent The manufacturing
method with spillway mentioned make use of stepped Spillways has a large number of projects.In this paper, the
use of physical models built in the Hydraulic Laboratory, Azad University of Dehdasht, flow was passed on
stepped spillway and by measuring depth of water, before and after hydraulic jump, were calculated the rates of
energy dissipation.The results of this research show that, due to the entry of air into water flow passing through,
on stepped overflows, use a water depth before the hydraulic jump in downstream order to determine the energy
loss, is caused estimating more (unrealistic) energy loss relative. In fact, with entry of air bubbles into the flow
(reduction of viscosity), reduced of the rate shear stress, and consequently the relative energy dissipation
properties, will be reduced. Also entry of air bubbles into the flow, causing increased volume of flow and
measurement, depth flow, which makes with error.
Keywords: stepped spillway, energy dissipation, hydraulic jump
I. INTRODUCTION
Stepped spillway, including structures that, order to energy dissipation and reducing of water erosion is
used over a period of river, which has a slope is steep,. Stepped spillway, is a hydraulic structures, very
powerful of Climactic spillway in Amortize the flow energy and reduce erosion downstream of the dams. When
the water flow by spillway from the reservoir to water surface in downstream, to falls, the potential energy is
converted to kinetic energy . This energy, in the form high-speed in downstream is appears, that, for the
prevention of river erosion in downstream, is necessary to install facilities such as Stepped spillways, is
amortized. During the investigation, it was observed that, the flow passing over a stepped spillway, and also deal
with successive steps, built on the steep side, as a foamy water (White water), in toe spillway occurs. Entry, high
bubbles of air into the flow (foamy pollution of water), reduces shear stress and reduces of energy dissipation
properties. Because most of the energy dissipation, on effect of shear stress between water molecules and the by
entry of air bubbles into the flow , is reduced of energy dissipation properties.on the other hand, the entry of
high bubbles of air into the flow leads to depth water increase in the toe of the spillway, and in Calculating of
energy dissipation between different researchers, discrepancies that arise. The last comments for calculating
depth of water in the downstream spillway should be used deep of Pure water (water without air bubbles).
Papers and various reports, show that the use of foamy water depth, by some researchers, is led to high estimates
of energy dissipation (the unreal).In this research, a physical model, was considered accordance with table 1,
with 10 steps and with 3 discharge, 0.01852, 0.02622 and 0.03131(m3
/s) and slope of 45 degrees, and, flowing
water of over it was passed and whit observation type of passing flow over the spillways, depth water before and
after the hydraulic jump by graded index, equipped on vernyeh with precision of 0.1(mm), in Three points were
measured, and the average of three measurements was used on the cross section, in calculation of energy
dissipation. Considering whit contents of the above, for showing, the obtained error of measurement, depth flow
(the depth of the initial flow before the jump), in determining the energy dissipation, the rate of energy
dissipation relative to the use of two methods using of direct measurement of the depth before of hydraulic jump
and using of the sequent depth after the hydraulic jump and calculated depth (y1), via relationship of hydraulic
jump, is performed.
2. Study and comparison of the rate of energy dissipation in stepped overflows before and after
International organization of Scientific Research 31 | P a g e
II. THEORETICAL RESEARCH
1.1 TYPES OF FLOW IN STEPPED SPILLWAYS
1.1.1 NAPPE FLOW REGIME: The flow, that which free jet, Collision of the upper step, to lower step. This type
of flow, occurs in low Discharge and high-tall steps. (Fig 1.)
1.1.2 SKIMMING FLOW REGIME: In the Skimming Flow Regime, steps act such as big coarseness against the
flow. (Fig 2.)
1.1.3 TRANSITIONAL FLOW REGIME: If the crossing flow over the stepped spillways with slop and Arbitrary
number of steps , at low Discharge a stat is falling, Gradually, then Discharge is increased, a case is observed, at
the boundary between two Flow the Skimming and Nappe and the conversion threshold is, to Skimming Flow
Regime, that this type of flow, is called transitional flow regime
1.2 THE GOVERNING EQUATIONS IN THE ENERGY DISSIPATION
1.2.1 ENERGY DISSIPATION, IN EFFECT, THE PHENOMENON OF HYDRAULIC JUMP
Supercritical flow in downstream (toe) spillway or the vertical slope breaker, after the formation of hydraulic
jump will become to sub-critical flow, and much of its energy, is depreciated the effect on formation of
hydraulic jump. The importance of energy dissipation, the effect of hydraulic jump, relating to, stepped spillway
whit very gentle slope and whit the occurrence nappe flow regime is over spillway.
By using of the equations of energy and momentum and continuity, equations determine the energy dissipation
resulting from hydraulic jump is easily provable.
hlj = ES1 − ES2 = y1 +
v1
2
2g
− y2 +
v2
2
2g
equations of energy (1)
hlj = y1 + hv1 − y2 − hv2 =
y2−y1
3
4y1y2
equations of energy (2)
1
2
γy1
2
−
1
2
γy2
2
= ρq v2 − v1 Momentum equation for rectangular cross section (3)
𝑞 = 𝑦1 𝑣1 = 𝑦2 𝑣2 Continuity equation for discharge per unit width (4)
hlj =
y2−y1
3
4y1y2
Equation of energy dissipation in a hydraulic jump (5)
𝑦2
y1
=
1
2
1 + 8Fr1
2
− 1 Public relations Hydraulic Jump (6)
In the above equation, Y1 and Y2 conjugate depths before and after the hydraulic jump, V1 and, V2 mean flow
velocity before and after the hydraulic jump, hlj energy dissipation into hydraulic jump and Fr1 Froude number
in place before Jump hydraulic.
1.2.2 ENERGY DISSIPATION SPILLOVERS AND VERTICAL SLOPES BREAKER
In all the subjects that are offered in different seasons of this research, the order of energy dissipation,
include of difference between energy in upstream of the spillway or the vertical slope breaker and energy in
downstream (toe), in location form depth, before hydraulic jump, (initial depth), which to following is shown.
∆𝐻 = 𝐻𝑡 − 𝐻1 = 1.5𝑌𝐶 + 𝐻 𝑑𝑎𝑚 − 𝑦1 +
𝑣1
2
2𝑔
(7)
Also The relative energy dissipation, is defined as follow:
∆H
Ht
=
𝐻t−H1
Ht
= 1 −
𝐻1
Ht
= 1 −
𝑦1+
𝑣1
2
2𝑔
1.5𝑌 𝐶+𝐻 𝑑𝑎𝑚
(8)
In the above relation, are Ht, total energy in the upstream spillway, Hl, energy in toe and before the hydraulic
jump, HDAM, total height spillway, h, height of step, yc and Y1, respectively, the critical depth and the depth
before hydraulic jump and V1, average speed before the hydraulic jump.
III. DESCRIPTION OF THE ISSUE
1.3 GEOMETRICAL CHARACTERISTICS AND HYDRAULICAL SPILLWAY
In this research, was used the characteristics of physical models (according to table 1), Hydraulic
Laboratory, Azad University of Dehdasht. In this research, was considered a physical model of, stepped
spillway, and experiments with Discharge of 0.01852, 0.02622 and 0.03131(m3
/s) was performed onto tmodel.
That, in this model, Has with 10 steps and a slope of 45 degrees, so that the height spillways of 8.5(cm). height
of Spillway model, was considered the constant and equal to 1 m. the Section curved shape of the spillway
(crest), was designed with the equation y = 1.68X1.85
. Flow was passed onto, Spillway model, and with
measuring, depth of water, before the hydraulic jump, (Y1) and the sequent depth of hydraulic jump, (Y2), were
calculated the rate of energy dissipation, per two cases and the results, together, were compared.
3. Study and comparison of the rate of energy dissipation in stepped overflows before and after
International organization of Scientific Research 32 | P a g e
Table 1 - Characteristics of the physical model spillway built.
The slope
of
Spillway
Number
of
Spillway
Width
Of
Flume
(cm)
Height
Of
Spillway
(cm)
Horizontal
length
of Spillway
(cm)
Height
of
model
(cm)
Gender Spillway
4510508.58.5100Galvanized iron
1.4 CALCULATION OF ENERGY DISSIPATION
Experiments was performed for three types of Discharge 0.01852, 0.02622 and 0.03131(m3
/s), onto
model was built and by measuring depths before and after the hydraulic jump, were calculated the rates of
energy dissipation and in Table (2) were recorded. results of investigations the phenomenon air entry into the
flow and the resulting erro of measurement, depth of flow, in calculated energy dissipation, is shown in Figure
2. in Figure 2, is used in vertical axis, the dimensionless parameter, the relative energy dissipation. That form,
∆H
Ht
=
Ht−H1
Ht
= 1 −
Ht
H1
, is defined, which, at that is, Ht, total upstream energy of the spillway (m), and H1,
downstream energy of the spillway (toe), and before the hydraulic jump (m). also it is necessary that amount,
H1, to be calculated the following two ways.
Use of the measured depth of flow before the hydraulic jump, (Y1), which, at this Section, Air entry and
fluctuating significantly water, the accuracy of measurement decreases.
Use of the measured depth of flow after the hydraulic jump (Y2), and then calculated depth (Y1), with
application famous relationship, depths conjugate of hydraulic jump.
IV. CONCLUSIONS
According to Table (2) and Figure (2) can be noted the following results:
- In calculating the relative energy dissipation,(
∆H
Ht
), direct application depth before the hydraulic jump
(Y1), estimated the rate of energy dissipation more, compared to depth of after the hydraulic jump (Y2). The
reason is that, with the use of depth Y1, is which contains a mixture of air and water, depth of flow
measurement, more than reality, and consequently estimated is energy at the toe of spillway, lower than a fact.
But with use of depth, Y2, and then calculated depth Y1, by famous relationship the depths of hydraulic jump,
the depth of pure water (Without air of bubbles), in toe of spillway, is entered in the calculations, and
ultimately, the difference in calculation of energy dissipation from here, is the result. Therefore, use of the depth
of pure water and Without air, for calculate the energy dissipation, is more logical because a large part of the
energy dissipation, on effect of shear stress between the water molecules occurs, and no shear stress between
molecules of air (density of water is 800-fold the density of air).
- by increasing the flow discharge, is increased, the difference between flow energy dissipation by using
depth before and after the hydraulic jump. This is consistent with observations. Because, with increased flow
discharge, on amount of water pollution foaming, (entrance, high air bubbles into the flow), added, and
measuring depth of flow before the hydraulic jump, more than the actual value, determined and, therefore
estimate the energy dissipation by using the measured depth is with more error, before the hydraulic jump.
RESOURCES AND REFERENCES
[1] Boes, R.M. Hager, H.W. 2003, Hydraulic design of stepped spillways, Journal of Hydraulic
Engineering. ASCE, Vol.129, No.9, 671- 679
[2] Chamani, M.R. and Rajaratnam, N, Jet flow on stepped spillways, Journal of Hydraulic ASCE,
Engineering. Vol.120, No.2, 254-259
[3] Chamani, M.R. Rajaratnam, N, Onset of skimming flow on stepped spillways, Journal of Hydraulic
Engineering. ASCE, Vol.125, No.9, 969-971
[4] Chen, Q. Dai, G. Liu, H, Volume of fluid model for turbulence numerical simulation of stepped spillway
overflow, Journal of Hydraulic Engineering, ASCE, Vol.128, No.7, 683-688.
[5] Christodoulou, G.C, Energy dissipation on stepped spillway, Journal of Hydraulic Engineering, ASCE,
Vol.119, No.5, 644-649.
[6] Salmasi. f, Hydraulic Evaluation of stepped spillways by using physical models, doctoral diss, University
of shahi Chamran, ahvaz, iran, 2003.
4. Study and comparison of the rate of energy dissipation in stepped overflows before and after
International organization of Scientific Research 33 | P a g e
Table 2 - Measurement and Calculation of hydraulic parameters for overflows stepped with specification
(N=10 , α=45 , b=50cm)
Hydraulic
characteristics
Test 1 Test 2 Test 3
Q (m3/s) 0.01852 0.02622 0.03131
q (m2/s) 0.038 0.054 0.064
Y1 (m) 0.029 0.039 0.036
V1 (m/s) 1.30 1.37 1.77
Fn 2.44 2.22 2.99
Ht (m) 1.09 1.11 1.12
H1 (m) 0.116 0.135 0.197
∆H=Ht – H1 0.973 0.975 0.925
∆H/Ht % 89.39 89.84 82.48
YC (m) 0.053 0.066 0.075
YC /h 0.619 0.780 0.878
Y2 (m) 0.104 0.131 0.172
Y1 (m) 0.022 0.028 0.025
V1 (m/s) 1.70 1.91 2.60
Fn 3.65 3.64 5.28
Rn*1000 37.80 53.51 63.90
H1 (m) 0.17 0.214 0.368
∆H=Ht – H1 0.919 0.896 0.754
∆H/Ht % 84.38 80.72 67.19
ERROR 5.94 11.3 22.76
Figure 2 - Comparison of the rate energy dissipation, flow by taking depth y1 and y2
0
10
20
30
40
50
60
70
80
90
100
0 0.02 0.04 0.06 0.08
∆H∕Ht%
Yc (m)
∆H∕Ht by considering y1
∆H∕Ht by considering y2