1) The document experimentally investigates pool boiling enhancement on different structured surfaces, including plain, V-shaped, and square structures.
2) The experiment was conducted in a boiling chamber by varying the electric supply and applying/not applying vibration. Surface temperature and heat flux were calculated.
3) The results showed that the square surface provided more appreciable heat flux and heat transfer coefficient compared to the other surfaces. Modifying the surface structure can enhance pool boiling heat transfer.
Analysis of A Double Spiral Counter Flow Calorimeter in Impinging Flame Jet U...IJERA Editor
Enhancement of heat transfer rates in heat exchanger and calorimeter has been reported by many researchers. However, work regarding heat transfer characteristics analysis of double spiral counter flow calorimeter is not published and this forms the objective of this work. DSCFC is a unique design where it consists of single fluid as working fluid for heat exchange. Here heat transfer takes place between solid and fluid, and hence can be called as conjugate heat transfer problem. Heat transfer characteristics DSCFC is observed at various Reynolds number and base temperature. DSCFC is analyzed considering conjugate heat transfer and temperature dependent properties of heat transport media. Computations are performed using commercially available CFD package ANSYS-CFX. It is observed that with increase in Reynolds number of the fluid, heat transfer reduces whereas increase in base temperature increases heat transfer. The Computational results are compared with the experimental.
Water cooled minichannel heat sinks for microprocessor cooling: Effect of fin...Danial Sohail
Heat sink with different fin spacing mounted on a microprocessor were tested for their heat removing capabilities by varying coolant flow rates over them
Cfd and conjugate heat transfer analysis of heat sinks with different fin geo...eSAT Journals
Abstract Heat sinks are commonly used for cooling of electronic devices. Heat sinks, an array of heat fins, remove the heat from the surfaces of the chips by enhancing the heat Transfer rate through heat conduction process. Heat can also be removed from the chip surfaces through forced convection heat transfer. In this project work, CFD and conjugate heat transfer analysis is carried out for various fin geometries with Zigzag, Fluted, Slanted mirror, Custom pin fin and staggered array configurations for low thermal resistance and minimum pressure drop. Numerical simulations are carried out for each of the above mentioned fin geometries with common base plate thickness of 2 mm, fin height of 28 mm and fin thickness of 1 mm for three different heat loads namely 50 W, 75 W and 100 W with air flow of 3.933 m/s (15 ft3/min or 15 CFM) and air inlet temperature of 25oC. The results are compared for thermal performance of a heat sink for each of above geometries and it is observe that the fin with Slanted Mirror geometry gives the best performance among all the other geometries for minimum Pressure drop. The average heat transfer coefficients for fins with slanted mirror geometry, zig zag configuration, fluted type, custom pin fin and staggered array are found to be 215 W/m2K, 164 W/m2K, 164 W/m2K, 157 W/m2K and 145 W/m2K respectively Keywords: Fin geometries of Heat sinks, Computational Fluid Dynamics, Conjugate heat transfer.
The present trend in the electronic packaging industry is to reduce the size and increase the performance of the equipment. As the power of these systems increases and the volume allowed diminishes, heat flux or density is spiraled. The cooling of modern electronic components is one of the prime areas for the application of thermal control techniques. Of the many thermal-cooling techniques, forced air-cooling being one such extensively used technique due to its simple design and easy availability of air. The present study is to design an air cooled high power electronic system to dissipate heat from selected electronic components.
Analysis of A Double Spiral Counter Flow Calorimeter in Impinging Flame Jet U...IJERA Editor
Enhancement of heat transfer rates in heat exchanger and calorimeter has been reported by many researchers. However, work regarding heat transfer characteristics analysis of double spiral counter flow calorimeter is not published and this forms the objective of this work. DSCFC is a unique design where it consists of single fluid as working fluid for heat exchange. Here heat transfer takes place between solid and fluid, and hence can be called as conjugate heat transfer problem. Heat transfer characteristics DSCFC is observed at various Reynolds number and base temperature. DSCFC is analyzed considering conjugate heat transfer and temperature dependent properties of heat transport media. Computations are performed using commercially available CFD package ANSYS-CFX. It is observed that with increase in Reynolds number of the fluid, heat transfer reduces whereas increase in base temperature increases heat transfer. The Computational results are compared with the experimental.
Water cooled minichannel heat sinks for microprocessor cooling: Effect of fin...Danial Sohail
Heat sink with different fin spacing mounted on a microprocessor were tested for their heat removing capabilities by varying coolant flow rates over them
Cfd and conjugate heat transfer analysis of heat sinks with different fin geo...eSAT Journals
Abstract Heat sinks are commonly used for cooling of electronic devices. Heat sinks, an array of heat fins, remove the heat from the surfaces of the chips by enhancing the heat Transfer rate through heat conduction process. Heat can also be removed from the chip surfaces through forced convection heat transfer. In this project work, CFD and conjugate heat transfer analysis is carried out for various fin geometries with Zigzag, Fluted, Slanted mirror, Custom pin fin and staggered array configurations for low thermal resistance and minimum pressure drop. Numerical simulations are carried out for each of the above mentioned fin geometries with common base plate thickness of 2 mm, fin height of 28 mm and fin thickness of 1 mm for three different heat loads namely 50 W, 75 W and 100 W with air flow of 3.933 m/s (15 ft3/min or 15 CFM) and air inlet temperature of 25oC. The results are compared for thermal performance of a heat sink for each of above geometries and it is observe that the fin with Slanted Mirror geometry gives the best performance among all the other geometries for minimum Pressure drop. The average heat transfer coefficients for fins with slanted mirror geometry, zig zag configuration, fluted type, custom pin fin and staggered array are found to be 215 W/m2K, 164 W/m2K, 164 W/m2K, 157 W/m2K and 145 W/m2K respectively Keywords: Fin geometries of Heat sinks, Computational Fluid Dynamics, Conjugate heat transfer.
The present trend in the electronic packaging industry is to reduce the size and increase the performance of the equipment. As the power of these systems increases and the volume allowed diminishes, heat flux or density is spiraled. The cooling of modern electronic components is one of the prime areas for the application of thermal control techniques. Of the many thermal-cooling techniques, forced air-cooling being one such extensively used technique due to its simple design and easy availability of air. The present study is to design an air cooled high power electronic system to dissipate heat from selected electronic components.
International Journal of Engineering and Science Invention (IJESI) is an international journal intended for professionals and researchers in all fields of computer science and electronics. IJESI publishes research articles and reviews within the whole field Engineering Science and Technology, new teaching methods, assessment, validation and the impact of new technologies and it will continue to provide information on the latest trends and developments in this ever-expanding subject. The publications of papers are selected through double peer reviewed to ensure originality, relevance, and readability. The articles published in our journal can be accessed online.
Experimental investigation on the effect of fin pitch on the performance of p...eSAT Publishing House
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.
Critical heat flux enhancement in pool boiling with al2 o3 water nanofluideSAT Journals
Abstract Boiling is an important phase change phenomena as it plays a crucial role in the design of high heat flux system like boilers, heat exchangers, microscopic heat transfer devices. However boiling phenomenon is limited by critical heat flux. At critical heat flux material of heated surface suffers physical damage due to lower heat transfer resulting from thin film formed over the surface. Now a days Nanofluid which is colloidal suspension of nanoparticle in base fluid is highlighted as innovative techniques to enhance critical heat flux. In the present study Al2O3 nanoparticles were characterized by using SEM and XRD analysis. From SEM images it was seen that nanoparticle has spherical morphology, and from XRD analysis average nanoparticle size determined was 29.48 nm. Five different nanofluids of concentration range from 3 gram/liter to 15 gram/liter were prepared. Critical heat flux (CHF) of each Al2O3-water nanofluid in pool boiling is determined on NiCr wire of SWG 28. The minimum critical heat flux enhancement is 30.53% at 3 gram/liter nanofluid compared to critical heat flux of distilled water. The highest critical heat flux enhancement is 72.70 % at 12 gram/liter nanofluid. Critical heat flux of nanofluid increases with increase in concentration of Al2O3 nanoparticle in distilled water up to 12 gram/liter nanofluid. Surface roughness of bare wire was 0.126 μm. Surface roughness of wire sample used in pool boiling of 3 gram/liter nanofluid is 0.299μm and highest surface roughness was 0.715 μm of heater used in pool boiling of 12 gram/liter nanofluid. The Surface roughness measurement results show the evidence of nanoparticle deposition on wire surface and its effect on Critical Heat Flux enhancement. Keywords: Critical heat flux, Nanoparticle, Nanofluid, Concentration, Surface roughness.
Influence of Different Parameters on Heat Pipe PerformanceIJERA Editor
In electrical and electronic industry due to miniaturization of electronic components heat density increases
which, in turns increases the heat flux inside it. Scientist and many researchers are doing lot of work in this field
for thermal management of devices. Heat pipe is a device that is used in electronic circuit (micro and power
electronics), spacecraft & electrical components for cooling purpose. It is based on the principle of evaporation
and condensation of working fluid. Heat pipe made up of three main parts are evaporator, adiabatic and
condenser sections. In this working fluid vaporise at evaporator and transfers heat to condenser by adiabatic
section where heat release to surrounding. Vapour flows possible from evaporator to condenser section due to
vapour pressure difference exist between them. Use of heat pipe material, type of working fluid & its property,
wick structure, orientation, filled ratio, operating condition, dimensions of pipe has a prominent effect on heat
pipe performance. Variation of these parameters for minimum thermal resistance gives better performance.
STUDY ON PREDICTION OF MECHANICAL PROPERTIES OF LARGE RING-SHAPED FORGING DEP...IAEME Publication
Large ring-shaped forgings manufactured by ring rolling, as heavy as 10 tons, are greatly affected by cooling. In the present study, controlled cooling was performed to improve the mechanical properties of large ring-shaped forgings. To quantify cooling rate, thermocouples were used to measure the cooling rate and the microstructures of the products were observed during still air cooling, fan cooling, mist control cooling, and water quenching. The temperature distribution measured in the four cooling methods was used to calculate the heat transfer coefficient in each cooling method by the inverse method. The mechanical properties were tested with specimens obtained from the test block for each cooling method, and continuous cooling transformation (CCT) curves were obtained by using measured microstructure contents. The mechanical properties of the regions corresponding to the regions of the specimens were calculated on the basis of the CCT curves and the heat transfer coefficients. The experimental values and the analytical values of the strength of the products manufactured by each cooling method were compared to verify that the mechanical properties at each region of the products depending on the cooling methods may be predicted
Design and Experimental Analysis of Rectangular Wavy Micro Channel Heat sinkAM Publications
An experimental investigation has been explore in order to study the flow of fluid and heat transfer characteristics on a Rectangular Wavy microchannel heat sink. Various applications are envisaged for the use of microchannel heat sink in electrical and electronic power generation and distribution. The Heat sink with microchannel is designed on an Aluminium specimen with Rectangular Wavy configuration with a channel cross section of 1mm x 0.5mm.To improve the heat transfer performance of the cooling system is achieved by using nanoparticles in the fluid passing through the microchannel heat sink. Results are presented by using different concentration (with 1% to 3%) of Nano fluids in water for the heat sink. Various cooling characteristics including thermal resistance, temperature drop and pressure drop across the microchannel heat sink are analysed for different volume concentrations, different volumetric flow rates and Reynolds number. Other significant characteristics for the measurement of heat transfer characteristics across this microchannel heat sink are also analysed and presented in this experiment.
Performance Evaluation of Thermoelectric Materials: A Case Study of Orthorhom...inventionjournals
Designers often face the predicament of non-standardized and poor performing materials for thermoelectric module manufacturing. Other than analytical means, the only method to evaluate the performance of thermoelectric materials would be through experimental means. This work studies the experimental approach employed in performance investigation of thermoelectric materials using Orthorhombic SnSe crystals as a case study. The result obtained reveals the high thermoelectric conversion efficiency of orthorhombic crystals, and that they can operate as both low and high temperature thermoelectric material.
THERMAL ANALYSIS OF A HEAT SINK FOR ELECTRONICS COOLINGIAEME Publication
Heat transfer is a discipline of thermal engineering that concern the generation, use, conversion and exchange of thermal energy, heat between physical systems. Heat transfer is classified in to various mechanisms such as heat conduction, convection, thermal radiation & transfer of energy by phase change. Most of the electronic equipment are low power and produce negligible amount of heat in their operation. Some devices, such as power transistors, CPU's, & power diodes produce a significant amount of heat. so sufficient measures are need to be taken so as to prolong their working life and reliability.
Increasing Inductor Lifetime by Predicting Coil Copper Temperatures PaperFluxtrol Inc.
In recent years, there has been a significant increase in the customer demands for improved induction coil lifetime. This has led to several publications in recent years by induction tooling manufacturers [1-4]. The main conclusion in these papers is that besides mechanical crashes the cause of most induction coil failures is localized overheating of the coil copper due to insufficient cooling.
What is lacking from these publications is any way to determine what is sufficient cooling. In this paper, a scientific method for determining local copper temperatures will be presented. This will include evaluations of heat transfer coefficients for different sections of a multi-component inductor, dependence of heat transfer coefficient on water pressure and water passage cross-section, non-uniform power density distributions in various 2-D cross-sections and the resulting temperature distribution in the copper winding. The effects of duty cycle on optimal design will also be considered.
human recourse information system; public sector; performance; satisfaction o...IJERA Editor
Electric Water Heaters are widely used all over the world that can be categorized in two types i.e. Instant Water Heaters & Storage type Water Heaters. The energy consumption for 6 liter water heaters is much higher in the storage type of water heater. As energy is an important factor for economic development of country, therefore there is need to save the energy which implies the focus to use Storage type Water Heaters. In 6 Liter water heater, Existing model converting from 4 star rating to 5 star rating by thermal analysis & insulation. After the theoretical calculation of thickness of glass wool is the practical testing of product with BEE norms & got results for 5 Star Calculation. Finally we are doing the thermal analysis for theoretical & practical verification of the product
Effectiveness analysis of a thermo siphon charged with norflurane as a runnin...eSAT Journals
Abstract This work presents an investigation of the thermal performance on Thermo-siphon charged with norflurane as a running fluid,
with electro chemical nano coating. This analysis was carried out to scrutinize the optimized fill ratio and angle of inclination for
better heat transfer enhancement. The fluctuation of heat transfer ability of the thermo-siphon was analyzed for the input heat
transfer rate varies from 0 to 350 W for various filling ratios and inclination of angle. The various fill ratio of the refrigerant used
in the analysis are 70%, 60%, 50%, 40% and 30% and angle of inclination for carrying out orientation analysis were taken as 0°,
45° and 90°. Experimental results showed that the fill ratio and orientation analysis showed a better heat transfer performance on
thermo-siphon while using Norflurane as a working fluid. Experimental investigations and calculations depicted that the thermal
resistance of 50% fill ratio was found to be lower than that of other fill ratios thereby leading to a better thermal performance for
thermo-siphon charged with Norflurane. Further, upon further investigation for orientation analysis it was found that the
horizontal inclination provided better heat transfer. Hence this present investigation indicates that the thermal performance of a
thermo-siphon can be enhanced using Norflurane at an optimal fill ratio of 50% and at an angle of inclination of 0°.
Keywords: Angle of Inclination, Filling Ratio, Heat Transfer, Norflurane, Thermal Resistance,Thermo-Siphon,
Electro Chemical Nano Coating.
Experimental Investigation on Heat Transfer Enhancement in Laminar Flow in Ci...IDES Editor
An experimental investigation of heat transfer and
friction factor of a smooth tube fitted with full length twisted
tape inserts for laminar flow have been studied under uniform
wall heat flux condition. The experiments has been carried
out to study the tape fin effect by using full length tape inserts
of different materials namely Aluminum, Stainless steel and
insulated tape. The tapes have twist ratios from 5.2 to 3.4. It is
found that, for the flow in smooth tubes, full length twisted
tapes yield improvement in average Nusselt number, for
Reynolds number range of 200 to 2000.For Aluminum tapes,
the maximum improvement in Nusselt number range from
50% to 100%; for Stainless steel tapes, maximum
improvement in Nusselt number range from 40% to 94% and
for insulated tapes, maximum improvement in Nusselt
number range from 40% to 67%. The isothermal friction factor
for the flow with the twisted tape inserts are 340% to 750 %
higher as compared with those of smooth tube flow, in the
given range of twist ratios.
Coefficient of Performance Enhancement of Refrigeration CyclesIJERA Editor
Refrigerator is one of the home appliance utilizing mechanical vapor compression cycle in its process. Performance of the systems become the main issue and many researches are still ongoing to evaluate and improve the efficiency of any used system. Therefore, this paper presents an experimental investigation of the performance of the refrigeration cycles. A small rrefrigerator is used as the test rig. The Coefficient of Performance (COP) is studied by using different condenser designs and under varying evaporator loads. Three condenser designs are used in present work. These condensers are regular condenser of domestic refrigerator, condenser with copper plain tubes (Cond.1) and condenser with copper tubes welded with stainless steel flat plate (Cond.2). pressures and temperatures measurements of each point in the refrigeration cycle are collected in order to evaluate the refrigerator performance. The results showed that the average COP of Cond.1 and Cond.2 are increased up to 20 % and 14% respectively more than regular condenser design under no load. The evaporator load effects on the machine performance, where the COP of the machine increases with the increase of the evaporator load.
In the present study the temperature distribution and the energy transfer from the electronics of a home appliance to an air-cooled heat sink via heat pipes is studied. The main objective of the research work is to ensure that the operation of electronic instruments is maintained under suitable working conditions. SINDA/FLUINT®, comprehensive software based on lumped parameter methods, specially focused in heat transfer and fluid flow modelling in complex systems, is used to create a model representing the cooling of an electronic board by transferring the dissipated energy to a heat sink via heat pipes.
International Journal of Engineering and Science Invention (IJESI) is an international journal intended for professionals and researchers in all fields of computer science and electronics. IJESI publishes research articles and reviews within the whole field Engineering Science and Technology, new teaching methods, assessment, validation and the impact of new technologies and it will continue to provide information on the latest trends and developments in this ever-expanding subject. The publications of papers are selected through double peer reviewed to ensure originality, relevance, and readability. The articles published in our journal can be accessed online.
Experimental investigation on the effect of fin pitch on the performance of p...eSAT Publishing House
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.
Critical heat flux enhancement in pool boiling with al2 o3 water nanofluideSAT Journals
Abstract Boiling is an important phase change phenomena as it plays a crucial role in the design of high heat flux system like boilers, heat exchangers, microscopic heat transfer devices. However boiling phenomenon is limited by critical heat flux. At critical heat flux material of heated surface suffers physical damage due to lower heat transfer resulting from thin film formed over the surface. Now a days Nanofluid which is colloidal suspension of nanoparticle in base fluid is highlighted as innovative techniques to enhance critical heat flux. In the present study Al2O3 nanoparticles were characterized by using SEM and XRD analysis. From SEM images it was seen that nanoparticle has spherical morphology, and from XRD analysis average nanoparticle size determined was 29.48 nm. Five different nanofluids of concentration range from 3 gram/liter to 15 gram/liter were prepared. Critical heat flux (CHF) of each Al2O3-water nanofluid in pool boiling is determined on NiCr wire of SWG 28. The minimum critical heat flux enhancement is 30.53% at 3 gram/liter nanofluid compared to critical heat flux of distilled water. The highest critical heat flux enhancement is 72.70 % at 12 gram/liter nanofluid. Critical heat flux of nanofluid increases with increase in concentration of Al2O3 nanoparticle in distilled water up to 12 gram/liter nanofluid. Surface roughness of bare wire was 0.126 μm. Surface roughness of wire sample used in pool boiling of 3 gram/liter nanofluid is 0.299μm and highest surface roughness was 0.715 μm of heater used in pool boiling of 12 gram/liter nanofluid. The Surface roughness measurement results show the evidence of nanoparticle deposition on wire surface and its effect on Critical Heat Flux enhancement. Keywords: Critical heat flux, Nanoparticle, Nanofluid, Concentration, Surface roughness.
Influence of Different Parameters on Heat Pipe PerformanceIJERA Editor
In electrical and electronic industry due to miniaturization of electronic components heat density increases
which, in turns increases the heat flux inside it. Scientist and many researchers are doing lot of work in this field
for thermal management of devices. Heat pipe is a device that is used in electronic circuit (micro and power
electronics), spacecraft & electrical components for cooling purpose. It is based on the principle of evaporation
and condensation of working fluid. Heat pipe made up of three main parts are evaporator, adiabatic and
condenser sections. In this working fluid vaporise at evaporator and transfers heat to condenser by adiabatic
section where heat release to surrounding. Vapour flows possible from evaporator to condenser section due to
vapour pressure difference exist between them. Use of heat pipe material, type of working fluid & its property,
wick structure, orientation, filled ratio, operating condition, dimensions of pipe has a prominent effect on heat
pipe performance. Variation of these parameters for minimum thermal resistance gives better performance.
STUDY ON PREDICTION OF MECHANICAL PROPERTIES OF LARGE RING-SHAPED FORGING DEP...IAEME Publication
Large ring-shaped forgings manufactured by ring rolling, as heavy as 10 tons, are greatly affected by cooling. In the present study, controlled cooling was performed to improve the mechanical properties of large ring-shaped forgings. To quantify cooling rate, thermocouples were used to measure the cooling rate and the microstructures of the products were observed during still air cooling, fan cooling, mist control cooling, and water quenching. The temperature distribution measured in the four cooling methods was used to calculate the heat transfer coefficient in each cooling method by the inverse method. The mechanical properties were tested with specimens obtained from the test block for each cooling method, and continuous cooling transformation (CCT) curves were obtained by using measured microstructure contents. The mechanical properties of the regions corresponding to the regions of the specimens were calculated on the basis of the CCT curves and the heat transfer coefficients. The experimental values and the analytical values of the strength of the products manufactured by each cooling method were compared to verify that the mechanical properties at each region of the products depending on the cooling methods may be predicted
Design and Experimental Analysis of Rectangular Wavy Micro Channel Heat sinkAM Publications
An experimental investigation has been explore in order to study the flow of fluid and heat transfer characteristics on a Rectangular Wavy microchannel heat sink. Various applications are envisaged for the use of microchannel heat sink in electrical and electronic power generation and distribution. The Heat sink with microchannel is designed on an Aluminium specimen with Rectangular Wavy configuration with a channel cross section of 1mm x 0.5mm.To improve the heat transfer performance of the cooling system is achieved by using nanoparticles in the fluid passing through the microchannel heat sink. Results are presented by using different concentration (with 1% to 3%) of Nano fluids in water for the heat sink. Various cooling characteristics including thermal resistance, temperature drop and pressure drop across the microchannel heat sink are analysed for different volume concentrations, different volumetric flow rates and Reynolds number. Other significant characteristics for the measurement of heat transfer characteristics across this microchannel heat sink are also analysed and presented in this experiment.
Performance Evaluation of Thermoelectric Materials: A Case Study of Orthorhom...inventionjournals
Designers often face the predicament of non-standardized and poor performing materials for thermoelectric module manufacturing. Other than analytical means, the only method to evaluate the performance of thermoelectric materials would be through experimental means. This work studies the experimental approach employed in performance investigation of thermoelectric materials using Orthorhombic SnSe crystals as a case study. The result obtained reveals the high thermoelectric conversion efficiency of orthorhombic crystals, and that they can operate as both low and high temperature thermoelectric material.
THERMAL ANALYSIS OF A HEAT SINK FOR ELECTRONICS COOLINGIAEME Publication
Heat transfer is a discipline of thermal engineering that concern the generation, use, conversion and exchange of thermal energy, heat between physical systems. Heat transfer is classified in to various mechanisms such as heat conduction, convection, thermal radiation & transfer of energy by phase change. Most of the electronic equipment are low power and produce negligible amount of heat in their operation. Some devices, such as power transistors, CPU's, & power diodes produce a significant amount of heat. so sufficient measures are need to be taken so as to prolong their working life and reliability.
Increasing Inductor Lifetime by Predicting Coil Copper Temperatures PaperFluxtrol Inc.
In recent years, there has been a significant increase in the customer demands for improved induction coil lifetime. This has led to several publications in recent years by induction tooling manufacturers [1-4]. The main conclusion in these papers is that besides mechanical crashes the cause of most induction coil failures is localized overheating of the coil copper due to insufficient cooling.
What is lacking from these publications is any way to determine what is sufficient cooling. In this paper, a scientific method for determining local copper temperatures will be presented. This will include evaluations of heat transfer coefficients for different sections of a multi-component inductor, dependence of heat transfer coefficient on water pressure and water passage cross-section, non-uniform power density distributions in various 2-D cross-sections and the resulting temperature distribution in the copper winding. The effects of duty cycle on optimal design will also be considered.
human recourse information system; public sector; performance; satisfaction o...IJERA Editor
Electric Water Heaters are widely used all over the world that can be categorized in two types i.e. Instant Water Heaters & Storage type Water Heaters. The energy consumption for 6 liter water heaters is much higher in the storage type of water heater. As energy is an important factor for economic development of country, therefore there is need to save the energy which implies the focus to use Storage type Water Heaters. In 6 Liter water heater, Existing model converting from 4 star rating to 5 star rating by thermal analysis & insulation. After the theoretical calculation of thickness of glass wool is the practical testing of product with BEE norms & got results for 5 Star Calculation. Finally we are doing the thermal analysis for theoretical & practical verification of the product
Effectiveness analysis of a thermo siphon charged with norflurane as a runnin...eSAT Journals
Abstract This work presents an investigation of the thermal performance on Thermo-siphon charged with norflurane as a running fluid,
with electro chemical nano coating. This analysis was carried out to scrutinize the optimized fill ratio and angle of inclination for
better heat transfer enhancement. The fluctuation of heat transfer ability of the thermo-siphon was analyzed for the input heat
transfer rate varies from 0 to 350 W for various filling ratios and inclination of angle. The various fill ratio of the refrigerant used
in the analysis are 70%, 60%, 50%, 40% and 30% and angle of inclination for carrying out orientation analysis were taken as 0°,
45° and 90°. Experimental results showed that the fill ratio and orientation analysis showed a better heat transfer performance on
thermo-siphon while using Norflurane as a working fluid. Experimental investigations and calculations depicted that the thermal
resistance of 50% fill ratio was found to be lower than that of other fill ratios thereby leading to a better thermal performance for
thermo-siphon charged with Norflurane. Further, upon further investigation for orientation analysis it was found that the
horizontal inclination provided better heat transfer. Hence this present investigation indicates that the thermal performance of a
thermo-siphon can be enhanced using Norflurane at an optimal fill ratio of 50% and at an angle of inclination of 0°.
Keywords: Angle of Inclination, Filling Ratio, Heat Transfer, Norflurane, Thermal Resistance,Thermo-Siphon,
Electro Chemical Nano Coating.
Experimental Investigation on Heat Transfer Enhancement in Laminar Flow in Ci...IDES Editor
An experimental investigation of heat transfer and
friction factor of a smooth tube fitted with full length twisted
tape inserts for laminar flow have been studied under uniform
wall heat flux condition. The experiments has been carried
out to study the tape fin effect by using full length tape inserts
of different materials namely Aluminum, Stainless steel and
insulated tape. The tapes have twist ratios from 5.2 to 3.4. It is
found that, for the flow in smooth tubes, full length twisted
tapes yield improvement in average Nusselt number, for
Reynolds number range of 200 to 2000.For Aluminum tapes,
the maximum improvement in Nusselt number range from
50% to 100%; for Stainless steel tapes, maximum
improvement in Nusselt number range from 40% to 94% and
for insulated tapes, maximum improvement in Nusselt
number range from 40% to 67%. The isothermal friction factor
for the flow with the twisted tape inserts are 340% to 750 %
higher as compared with those of smooth tube flow, in the
given range of twist ratios.
Coefficient of Performance Enhancement of Refrigeration CyclesIJERA Editor
Refrigerator is one of the home appliance utilizing mechanical vapor compression cycle in its process. Performance of the systems become the main issue and many researches are still ongoing to evaluate and improve the efficiency of any used system. Therefore, this paper presents an experimental investigation of the performance of the refrigeration cycles. A small rrefrigerator is used as the test rig. The Coefficient of Performance (COP) is studied by using different condenser designs and under varying evaporator loads. Three condenser designs are used in present work. These condensers are regular condenser of domestic refrigerator, condenser with copper plain tubes (Cond.1) and condenser with copper tubes welded with stainless steel flat plate (Cond.2). pressures and temperatures measurements of each point in the refrigeration cycle are collected in order to evaluate the refrigerator performance. The results showed that the average COP of Cond.1 and Cond.2 are increased up to 20 % and 14% respectively more than regular condenser design under no load. The evaporator load effects on the machine performance, where the COP of the machine increases with the increase of the evaporator load.
In the present study the temperature distribution and the energy transfer from the electronics of a home appliance to an air-cooled heat sink via heat pipes is studied. The main objective of the research work is to ensure that the operation of electronic instruments is maintained under suitable working conditions. SINDA/FLUINT®, comprehensive software based on lumped parameter methods, specially focused in heat transfer and fluid flow modelling in complex systems, is used to create a model representing the cooling of an electronic board by transferring the dissipated energy to a heat sink via heat pipes.
Analysis of Heat Transfer in Spiral Plate Heat Exchanger Using Experimental a...ijsrd.com
Heat transfer is the key to several processes in industrial application. In a present days maximum efficient heat transfer equipment are in demand due to increasing energy cost. For achieving maximum heat transfer, the engineers are continuously upgrading their knowledge and skills by their past experience. Present work is a skip in the direction of demonstrating the use of the computational technique as a tool to substitute experimental techniques. For this purpose an experimental set up has been designed and developed. Analysis of heat transfer in spiral plate heat exchanger is performed and same Analysis of heat transfer in spiral plate heat exchanger can be done by commercially procurable computational fluid dynamic (CFD) using ANSYS CFX and validated based on this forecasting. Analysis has been carried out in parallel and counter flow with inward and outward direction for achieving maximum possible heat transfer. In this problem of heat transfer involved the condition where Reynolds number again and again varies as the fluid traverses inside the section of flow from inlet to exit, mass flow rate of working fluid is been modified with time. By more and more analysis and experimentation and systematic data degradation leads to the conclusion that the maximum heat transfer rates is obtained in case of the inward parallel flow configuration compared to all other counterparts, which observed to vary with small difference in each section. Furthermore, for the increase heat transfer rate in spiral plate heat exchanger is obtain by cascading system.
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.
Enhancement of heat transfer in tube in-tube heat exchangers using twisted in...Ijrdt Journal
Heat exchangers have several industrial and engineering applications. There are different methods to enhance heat transfer in heat exchangers. Passive technique of heat transfer is the most economical and best suited one. The role of inserts in internal forced convection has been widely acknowledged as a passive device in the heat transfer enhancement. One of such technique is introduction of twisted inserts which enhances the heat transfer coefficient. Twisted aluminium inserts when placed in the path of the fluid flow, creates a high degree of turbulence resulting in an increase in the heat transfer rate. By placing inserts, it is expected that the benefits due to the increased heat transfer coefficient overcome the higher cost involved because of the increased frictional losses. The work mainly focuses on increasing the heat transfer of tube-in-tube heat exchangers by using twisted aluminium inserts. The results obtained from the tube with twisted aluminium insert are compared with those without twisted insert using standard properties of heat transfer (LMTD & Effectiveness). The relations based on the data gathered during this work for predicting the heat transfer coefficient of the horizontal pipe with twisted taped insert are proposed. According to the results, in order to obtain maximum heat transfer, the twist ratio must be at the lowest level.
TECHNICAL TRAINING MANUAL GENERAL FAMILIARIZATION COURSEDuvanRamosGarzon1
AIRCRAFT GENERAL
The Single Aisle is the most advanced family aircraft in service today, with fly-by-wire flight controls.
The A318, A319, A320 and A321 are twin-engine subsonic medium range aircraft.
The family offers a choice of engines
Overview of the fundamental roles in Hydropower generation and the components involved in wider Electrical Engineering.
This paper presents the design and construction of hydroelectric dams from the hydrologist’s survey of the valley before construction, all aspects and involved disciplines, fluid dynamics, structural engineering, generation and mains frequency regulation to the very transmission of power through the network in the United Kingdom.
Author: Robbie Edward Sayers
Collaborators and co editors: Charlie Sims and Connor Healey.
(C) 2024 Robbie E. Sayers
Saudi Arabia stands as a titan in the global energy landscape, renowned for its abundant oil and gas resources. It's the largest exporter of petroleum and holds some of the world's most significant reserves. Let's delve into the top 10 oil and gas projects shaping Saudi Arabia's energy future in 2024.
Student information management system project report ii.pdfKamal Acharya
Our project explains about the student management. This project mainly explains the various actions related to student details. This project shows some ease in adding, editing and deleting the student details. It also provides a less time consuming process for viewing, adding, editing and deleting the marks of the students.
Quality defects in TMT Bars, Possible causes and Potential Solutions.PrashantGoswami42
Maintaining high-quality standards in the production of TMT bars is crucial for ensuring structural integrity in construction. Addressing common defects through careful monitoring, standardized processes, and advanced technology can significantly improve the quality of TMT bars. Continuous training and adherence to quality control measures will also play a pivotal role in minimizing these defects.
Courier management system project report.pdfKamal Acharya
It is now-a-days very important for the people to send or receive articles like imported furniture, electronic items, gifts, business goods and the like. People depend vastly on different transport systems which mostly use the manual way of receiving and delivering the articles. There is no way to track the articles till they are received and there is no way to let the customer know what happened in transit, once he booked some articles. In such a situation, we need a system which completely computerizes the cargo activities including time to time tracking of the articles sent. This need is fulfilled by Courier Management System software which is online software for the cargo management people that enables them to receive the goods from a source and send them to a required destination and track their status from time to time.
Industrial Training at Shahjalal Fertilizer Company Limited (SFCL)MdTanvirMahtab2
This presentation is about the working procedure of Shahjalal Fertilizer Company Limited (SFCL). A Govt. owned Company of Bangladesh Chemical Industries Corporation under Ministry of Industries.
Immunizing Image Classifiers Against Localized Adversary Attacksgerogepatton
This paper addresses the vulnerability of deep learning models, particularly convolutional neural networks
(CNN)s, to adversarial attacks and presents a proactive training technique designed to counter them. We
introduce a novel volumization algorithm, which transforms 2D images into 3D volumetric representations.
When combined with 3D convolution and deep curriculum learning optimization (CLO), itsignificantly improves
the immunity of models against localized universal attacks by up to 40%. We evaluate our proposed approach
using contemporary CNN architectures and the modified Canadian Institute for Advanced Research (CIFAR-10
and CIFAR-100) and ImageNet Large Scale Visual Recognition Challenge (ILSVRC12) datasets, showcasing
accuracy improvements over previous techniques. The results indicate that the combination of the volumetric
input and curriculum learning holds significant promise for mitigating adversarial attacks without necessitating
adversary training.
COLLEGE BUS MANAGEMENT SYSTEM PROJECT REPORT.pdfKamal Acharya
The College Bus Management system is completely developed by Visual Basic .NET Version. The application is connect with most secured database language MS SQL Server. The application is develop by using best combination of front-end and back-end languages. The application is totally design like flat user interface. This flat user interface is more attractive user interface in 2017. The application is gives more important to the system functionality. The application is to manage the student’s details, driver’s details, bus details, bus route details, bus fees details and more. The application has only one unit for admin. The admin can manage the entire application. The admin can login into the application by using username and password of the admin. The application is develop for big and small colleges. It is more user friendly for non-computer person. Even they can easily learn how to manage the application within hours. The application is more secure by the admin. The system will give an effective output for the VB.Net and SQL Server given as input to the system. The compiled java program given as input to the system, after scanning the program will generate different reports. The application generates the report for users. The admin can view and download the report of the data. The application deliver the excel format reports. Because, excel formatted reports is very easy to understand the income and expense of the college bus. This application is mainly develop for windows operating system users. In 2017, 73% of people enterprises are using windows operating system. So the application will easily install for all the windows operating system users. The application-developed size is very low. The application consumes very low space in disk. Therefore, the user can allocate very minimum local disk space for this application.