Pub Date : 2008-12-01DOI: 10.1109/THETA.2008.5167166
P. Tounsi, F. Madrid, J. Nowakowski
As power component manufacturers may not wish to publish confidential information about their technology, automotive system engineers are lacking in technical information for thermal design optimization. The device structure and material data information is particularly significant for electro-thermal coupling, to generate correct and reliable compact thermal model (CTM). Several innovations in methodologies for power components manufacturers are proposed in this paper, in order to accurately generate CTM.
{"title":"Nonlinear thermal resistance control equations for adaptive multiple cooling surface CTM, and boundary condition independent multiple heatsources CTM","authors":"P. Tounsi, F. Madrid, J. Nowakowski","doi":"10.1109/THETA.2008.5167166","DOIUrl":"https://doi.org/10.1109/THETA.2008.5167166","url":null,"abstract":"As power component manufacturers may not wish to publish confidential information about their technology, automotive system engineers are lacking in technical information for thermal design optimization. The device structure and material data information is particularly significant for electro-thermal coupling, to generate correct and reliable compact thermal model (CTM). Several innovations in methodologies for power components manufacturers are proposed in this paper, in order to accurately generate CTM.","PeriodicalId":414963,"journal":{"name":"2008 Second International Conference on Thermal Issues in Emerging Technologies","volume":"46 3 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126911133","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2008-12-01DOI: 10.1109/THETA.2008.5167184
R. Khodabandeh, M. Lindstrom
In this study the tested evaporator is made from small blocks of copper with 11 vertical channels with a diameter of 2.5 mm and length of 30 mm. The riser and downcomer connected the evaporator to the condenser, which is cooled by air in free or forced convection. The condenser is made from 10 mm aluminium heat sink profile of the size of 365times365 mm with a fin length of 20 mm at a distance of 8 mm. In the top part of the heat sink a condenser channel system with 2times2 mm cross section is milled. The CPU used in this study is an Intel Pentium 4 with 3.2 GHz. The maximum heat load to the processor is 104 W, and the highest temperature allowed on the processor is 65degC. Temperatures are measured for idle, 50% and maximum heat load of the processor at the CPU, evaporator wall, condenser wall and in the ambient. Temperature differences in the thermosyphon system, between the CPU and the evaporator wall, the condenser wall and ambient are presented. Isobutane has been used as the working fluid, due to the fact that it has low saturation pressure and that this refrigerant is friendly to the environment.
{"title":"Cooling of CPU with a thermosyphon","authors":"R. Khodabandeh, M. Lindstrom","doi":"10.1109/THETA.2008.5167184","DOIUrl":"https://doi.org/10.1109/THETA.2008.5167184","url":null,"abstract":"In this study the tested evaporator is made from small blocks of copper with 11 vertical channels with a diameter of 2.5 mm and length of 30 mm. The riser and downcomer connected the evaporator to the condenser, which is cooled by air in free or forced convection. The condenser is made from 10 mm aluminium heat sink profile of the size of 365times365 mm with a fin length of 20 mm at a distance of 8 mm. In the top part of the heat sink a condenser channel system with 2times2 mm cross section is milled. The CPU used in this study is an Intel Pentium 4 with 3.2 GHz. The maximum heat load to the processor is 104 W, and the highest temperature allowed on the processor is 65degC. Temperatures are measured for idle, 50% and maximum heat load of the processor at the CPU, evaporator wall, condenser wall and in the ambient. Temperature differences in the thermosyphon system, between the CPU and the evaporator wall, the condenser wall and ambient are presented. Isobutane has been used as the working fluid, due to the fact that it has low saturation pressure and that this refrigerant is friendly to the environment.","PeriodicalId":414963,"journal":{"name":"2008 Second International Conference on Thermal Issues in Emerging Technologies","volume":"22 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115996694","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2008-12-01DOI: 10.1109/THETA.2008.5167197
E. Khalil
There are several factors that affect the hygiene in the surgical operating theatres. The HVAC airside system plays an important role to maintain the adequate hygiene level in the operating theatres. The present paper displays comparisons between different HVAC airside designs to assess their impact on the surgery staff and patient health and comfort. The present work utilizes a numerical modelling technique to predict local flow field characteristics, heat transfer and air distribution profiles. To reduce the infection possibilities of the surgery staff and patients, it should reduce the backward flow from the polluted zones towards the clean zones and the recirculated zones; also, the air infection by direct and indirect ways should be avoided. The present paper introduces suitable design of the HVAC airside system that is based on application of dasiathe centralized partially ceiling supply flowpsila with the two extract levels to ensure the hygiene of the occupancy of the operating theatres.
{"title":"Air flow regimes and IAQ modeling in air conditioned spaces","authors":"E. Khalil","doi":"10.1109/THETA.2008.5167197","DOIUrl":"https://doi.org/10.1109/THETA.2008.5167197","url":null,"abstract":"There are several factors that affect the hygiene in the surgical operating theatres. The HVAC airside system plays an important role to maintain the adequate hygiene level in the operating theatres. The present paper displays comparisons between different HVAC airside designs to assess their impact on the surgery staff and patient health and comfort. The present work utilizes a numerical modelling technique to predict local flow field characteristics, heat transfer and air distribution profiles. To reduce the infection possibilities of the surgery staff and patients, it should reduce the backward flow from the polluted zones towards the clean zones and the recirculated zones; also, the air infection by direct and indirect ways should be avoided. The present paper introduces suitable design of the HVAC airside system that is based on application of dasiathe centralized partially ceiling supply flowpsila with the two extract levels to ensure the hygiene of the occupancy of the operating theatres.","PeriodicalId":414963,"journal":{"name":"2008 Second International Conference on Thermal Issues in Emerging Technologies","volume":"57 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115838815","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2008-12-01DOI: 10.1109/THETA.2008.5167168
M. Ishizuka, S. Nakagawa, Y. Nishino, T. Fukue
This study has been conducted by aiming at acquisition of benchmark test data for CFD simulations for thin electronic equipment. Flow in the model of a thin electronic equipment was measured using a PIV. Dummy components were placed in the model and those configurations were altered. The temperature rise of a heat source in the model was also measured and the cooling performance was examined. PIV measurement results clarified the change of flow depending on the configuration. The comparison of experimental results with numerical results shows a reasonable agreement.
{"title":"Experimental study on cooling air flow in a thin electronics casing model","authors":"M. Ishizuka, S. Nakagawa, Y. Nishino, T. Fukue","doi":"10.1109/THETA.2008.5167168","DOIUrl":"https://doi.org/10.1109/THETA.2008.5167168","url":null,"abstract":"This study has been conducted by aiming at acquisition of benchmark test data for CFD simulations for thin electronic equipment. Flow in the model of a thin electronic equipment was measured using a PIV. Dummy components were placed in the model and those configurations were altered. The temperature rise of a heat source in the model was also measured and the cooling performance was examined. PIV measurement results clarified the change of flow depending on the configuration. The comparison of experimental results with numerical results shows a reasonable agreement.","PeriodicalId":414963,"journal":{"name":"2008 Second International Conference on Thermal Issues in Emerging Technologies","volume":"7 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131986879","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2008-12-01DOI: 10.1109/THETA.2008.5167189
M. Ashjaee, S. Amiri, K. Habibi
The heat transfer characteristics of a circular cylinder exposed to a slot jet impingement of air has been studied experimentally. The study focused on low Reynolds numbers ranging from 120 to 1210 and slot-to-cylinder spacing from 2 to 8 of the slot width. A Mach-Zehnder interferometer was used in the experimental study. Local Nusselt numbers at cylinder surface were obtained using infinite fringe mode which corresponds directly to isotherms in the flow field. It has shown that the local Nusselt number has a maximum value at the stagnation point and then decreases to a minimum distance between isotherms. It is observed that slot jet impingement has a great effect on the local heat transfer coefficient from the stagnation point to the angle of 120deg and local Nusselt number at the downstream is approximately similar to the case of free convection for the low and moderate Reynolds numbers. In addition, increasing the distance between nozzle and cylinder decreases average heat transfer coefficients. In order to check the accuracy of the experiment and method of data reduction first the case of free convection was tested and the results were compared with the previous works which has an excellent agreement.
{"title":"Slot jet impingement heat transfer from an isothermal circular cylinder","authors":"M. Ashjaee, S. Amiri, K. Habibi","doi":"10.1109/THETA.2008.5167189","DOIUrl":"https://doi.org/10.1109/THETA.2008.5167189","url":null,"abstract":"The heat transfer characteristics of a circular cylinder exposed to a slot jet impingement of air has been studied experimentally. The study focused on low Reynolds numbers ranging from 120 to 1210 and slot-to-cylinder spacing from 2 to 8 of the slot width. A Mach-Zehnder interferometer was used in the experimental study. Local Nusselt numbers at cylinder surface were obtained using infinite fringe mode which corresponds directly to isotherms in the flow field. It has shown that the local Nusselt number has a maximum value at the stagnation point and then decreases to a minimum distance between isotherms. It is observed that slot jet impingement has a great effect on the local heat transfer coefficient from the stagnation point to the angle of 120deg and local Nusselt number at the downstream is approximately similar to the case of free convection for the low and moderate Reynolds numbers. In addition, increasing the distance between nozzle and cylinder decreases average heat transfer coefficients. In order to check the accuracy of the experiment and method of data reduction first the case of free convection was tested and the results were compared with the previous works which has an excellent agreement.","PeriodicalId":414963,"journal":{"name":"2008 Second International Conference on Thermal Issues in Emerging Technologies","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134218400","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2008-12-01DOI: 10.1109/THETA.2008.5167192
K. Leong, Hongying Li, Liwen Jin, J. Chai
Along with recent advances in electronic packaging, high performance computer processors require more efficient devices for dissipating the high heat fluxes. The use of highly conductive porous media has emerged as an effective cooling method due to its large internal contact surface area which enhances convection at the pore level. In this study, graphite foams developed at Oak Ridge National Laboratory, USA, are used to enhance heat transfer. Initial studies performed by other investigators showed that the extended surface area also results in very high pressure drop for fluid flowing through the graphite foam. This paper presents a numerical and experimental study of convection heat transfer in graphite foams with different structures which are designed to reduce pressure drop. The non local thermal equilibrium model is adopted in the fluid and solid energy equations. The numerical results which are validated by experimental data show that the inlet air flow partially penetrates the designed foam walls and the rest of the air flows tortuously through slots in the structure. Flow mixing is observed in the free stream area inside the structures, which is absent in block graphite foam. This indicates that better convection can be obtained by these structures due to their low flow resistance and high flow velocity. The pressure drop in the designed graphite foam is also found to be significantly lower than that in solid block graphite foam.
{"title":"Convective heat transfer in graphite foams with complex structures","authors":"K. Leong, Hongying Li, Liwen Jin, J. Chai","doi":"10.1109/THETA.2008.5167192","DOIUrl":"https://doi.org/10.1109/THETA.2008.5167192","url":null,"abstract":"Along with recent advances in electronic packaging, high performance computer processors require more efficient devices for dissipating the high heat fluxes. The use of highly conductive porous media has emerged as an effective cooling method due to its large internal contact surface area which enhances convection at the pore level. In this study, graphite foams developed at Oak Ridge National Laboratory, USA, are used to enhance heat transfer. Initial studies performed by other investigators showed that the extended surface area also results in very high pressure drop for fluid flowing through the graphite foam. This paper presents a numerical and experimental study of convection heat transfer in graphite foams with different structures which are designed to reduce pressure drop. The non local thermal equilibrium model is adopted in the fluid and solid energy equations. The numerical results which are validated by experimental data show that the inlet air flow partially penetrates the designed foam walls and the rest of the air flows tortuously through slots in the structure. Flow mixing is observed in the free stream area inside the structures, which is absent in block graphite foam. This indicates that better convection can be obtained by these structures due to their low flow resistance and high flow velocity. The pressure drop in the designed graphite foam is also found to be significantly lower than that in solid block graphite foam.","PeriodicalId":414963,"journal":{"name":"2008 Second International Conference on Thermal Issues in Emerging Technologies","volume":"11 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116988058","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2008-12-01DOI: 10.1109/THETA.2008.5167187
K. Nakamura, T. Kawanami, S. Hirano, M. Ikegawa, K. Fumoto
In order to elucidate the cooling characteristics and to improve the cooling performance of a room temperature magnetic refrigerator using air as a heat transfer fluid, experimental and analytical study concerned with the heat transfer characteristics of an active magnetic regenerator (AMR) are conducted. The basic components of the target system are a magnetic circuit, a test section, a fluid supplying system and an associated instrumentation. Spherical gadolinium particles are packed in the test section as a magnetic working substance. Temperature profiles under several operating conditions for the Air-AMR are measured and calculated. Also, those for the Water-AMR are investigated in order to compare with the Air-AMR. The results show that the AMR cycle is very effective for improvement of the cooling performance of a room-temperature magnetic refrigerator for both heat transfer fluids, because increase in the temperature span between the hot-end and the cold-end due to regeneration is realized. Furthermore, it is revealed that a high flow rate of air is necessary in order to improve the cooling performance of the Air-AMR refrigerator, compared with the case of the Water-AMR. It is also shown that thermophysical properties of the heat transfer fluid have a significant effect on the cooling characteristics of an AMR refrigerator.
{"title":"Improvement of room temperature magnetic refrigerator using air as heat transfer fluid","authors":"K. Nakamura, T. Kawanami, S. Hirano, M. Ikegawa, K. Fumoto","doi":"10.1109/THETA.2008.5167187","DOIUrl":"https://doi.org/10.1109/THETA.2008.5167187","url":null,"abstract":"In order to elucidate the cooling characteristics and to improve the cooling performance of a room temperature magnetic refrigerator using air as a heat transfer fluid, experimental and analytical study concerned with the heat transfer characteristics of an active magnetic regenerator (AMR) are conducted. The basic components of the target system are a magnetic circuit, a test section, a fluid supplying system and an associated instrumentation. Spherical gadolinium particles are packed in the test section as a magnetic working substance. Temperature profiles under several operating conditions for the Air-AMR are measured and calculated. Also, those for the Water-AMR are investigated in order to compare with the Air-AMR. The results show that the AMR cycle is very effective for improvement of the cooling performance of a room-temperature magnetic refrigerator for both heat transfer fluids, because increase in the temperature span between the hot-end and the cold-end due to regeneration is realized. Furthermore, it is revealed that a high flow rate of air is necessary in order to improve the cooling performance of the Air-AMR refrigerator, compared with the case of the Water-AMR. It is also shown that thermophysical properties of the heat transfer fluid have a significant effect on the cooling characteristics of an AMR refrigerator.","PeriodicalId":414963,"journal":{"name":"2008 Second International Conference on Thermal Issues in Emerging Technologies","volume":"153 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116419325","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2008-12-01DOI: 10.1109/THETA.2008.5167190
A. Cavallini, S. Mancin, L. Rossetto, C. Zilio
This paper presents the experimental heat transfer and pressure drops measurements relative to single phase air flow through two different Aluminum foams, electrically heated. Because of their interesting heat transfer and mechanical properties, metal foams have been proposed for several different applications both thermal and structural. The tested Aluminum foams present 5 and 40 pores per inch (PPI) respectively and they have been inserted in a new test equipment located at the Department of Fisica Tecnica of the University of Padova. The experimental heat transfer coefficients and pressure drops have been collected by varying the air mass flow rate and the electrical power which has been set at 25.0, 32.5 and 40.0 kW m2. This paper aims to point out the effective thermal fluid dynamic behaviour of these new enhanced surfaces which present high heat transfer area per unit of volume at the expense of high pressure drop. Moreover, the results of several semi-empirical correlations for pressure gradient calculation have been compared with the collected experimental data points.
{"title":"Heat transfer performance of Aluminum foams during single phase air flow","authors":"A. Cavallini, S. Mancin, L. Rossetto, C. Zilio","doi":"10.1109/THETA.2008.5167190","DOIUrl":"https://doi.org/10.1109/THETA.2008.5167190","url":null,"abstract":"This paper presents the experimental heat transfer and pressure drops measurements relative to single phase air flow through two different Aluminum foams, electrically heated. Because of their interesting heat transfer and mechanical properties, metal foams have been proposed for several different applications both thermal and structural. The tested Aluminum foams present 5 and 40 pores per inch (PPI) respectively and they have been inserted in a new test equipment located at the Department of Fisica Tecnica of the University of Padova. The experimental heat transfer coefficients and pressure drops have been collected by varying the air mass flow rate and the electrical power which has been set at 25.0, 32.5 and 40.0 kW m2. This paper aims to point out the effective thermal fluid dynamic behaviour of these new enhanced surfaces which present high heat transfer area per unit of volume at the expense of high pressure drop. Moreover, the results of several semi-empirical correlations for pressure gradient calculation have been compared with the collected experimental data points.","PeriodicalId":414963,"journal":{"name":"2008 Second International Conference on Thermal Issues in Emerging Technologies","volume":"42 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132476739","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2008-12-01DOI: 10.1109/THETA.2008.5167183
I. Shekriladze
A keynote paper presents just the next attempt to promote a discussion of modern state of art in the field of boiling heat transfer research. It is shown how unwillingness to deconstruct internal contradictions of applicable approaches has resulted longstanding theoretical deadlock. Alternatively, it also is shown how resolution of these contradictions opens the ways to breakthrough in boiling heat transfer theory Principal contradictions between experimental knowledge and traditional model of ldquothe theatre of actorsrdquo (MTA) are discussed. Basic experimental facts, physical models and correlations of experimental data are reconsidered. Crucial role of pumping effect of growing bubble (PEGB) in boiling heat transfer and hydrodynamics is shown. Basic role of control of HTC by thermodynamic conditions on nucleation sites is demonstrated and consequent model of ldquothe theatre of directorrdquo (MTD) is discussed. Universal MTD-based correlation of boiling HTC of all types of liquids is considered. Unified consistent research framework for developed boiling heat transfer and diverse specific boiling heat transfer regimes is outlined through supplementing MTD by so-called multifactoring concept (MFC). MFC links transition from developed boiling mode to diverse boiling curves to a phenomenon of multiplication of factors influencing HTC. It is shown also that multifactoring phenomenon equally can cover any boiling process including boiling in minichannels and microchannels. Possible types of multifactoring are considered. The ways of further research of the boiling problem are discussed.
{"title":"Boiling in macro and micro systems: Existing problems and ways of further research","authors":"I. Shekriladze","doi":"10.1109/THETA.2008.5167183","DOIUrl":"https://doi.org/10.1109/THETA.2008.5167183","url":null,"abstract":"A keynote paper presents just the next attempt to promote a discussion of modern state of art in the field of boiling heat transfer research. It is shown how unwillingness to deconstruct internal contradictions of applicable approaches has resulted longstanding theoretical deadlock. Alternatively, it also is shown how resolution of these contradictions opens the ways to breakthrough in boiling heat transfer theory Principal contradictions between experimental knowledge and traditional model of ldquothe theatre of actorsrdquo (MTA) are discussed. Basic experimental facts, physical models and correlations of experimental data are reconsidered. Crucial role of pumping effect of growing bubble (PEGB) in boiling heat transfer and hydrodynamics is shown. Basic role of control of HTC by thermodynamic conditions on nucleation sites is demonstrated and consequent model of ldquothe theatre of directorrdquo (MTD) is discussed. Universal MTD-based correlation of boiling HTC of all types of liquids is considered. Unified consistent research framework for developed boiling heat transfer and diverse specific boiling heat transfer regimes is outlined through supplementing MTD by so-called multifactoring concept (MFC). MFC links transition from developed boiling mode to diverse boiling curves to a phenomenon of multiplication of factors influencing HTC. It is shown also that multifactoring phenomenon equally can cover any boiling process including boiling in minichannels and microchannels. Possible types of multifactoring are considered. The ways of further research of the boiling problem are discussed.","PeriodicalId":414963,"journal":{"name":"2008 Second International Conference on Thermal Issues in Emerging Technologies","volume":"27 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126747289","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2008-12-01DOI: 10.1109/THETA.2008.5167180
P. Bagnoli, C. Padovani, A. Pagni, G. Pasquinelli
The DJOSER analytical thermal solver for multilayer mounting structures has been tested as a useful and friendly tool for the thermal analysis of power electronic devices and their packages, able to replace the onerous programs based on the finite element (FEM) calculations. The other problem connected with the packaging evaluation is the calculation of the thermally induced stresses and strains in the various layers composing the assembling structures. This paper deals with the first step of the implementation of a thermo-mechanical solver to be connected with the DJOSER program, which may be able to calculate the stresses at the layer interfaces, using the same strategy, i.e. a semi-analytical mathematical approach, and the same DJOSER structural constrains (stepped pyramidal structures, homogeneous layers). The basic theory is briefly exposed and the method is applied to some two-layers virtual structures. The obtained results are compared with those obtained using standard FEM analyses, revealing a substantial agreement but also some local disagreements.
{"title":"Integrating a thermo-mechanical solver into the DJOSER analytical thermal simulator for multilayer power electronic assemblies. Preliminary results","authors":"P. Bagnoli, C. Padovani, A. Pagni, G. Pasquinelli","doi":"10.1109/THETA.2008.5167180","DOIUrl":"https://doi.org/10.1109/THETA.2008.5167180","url":null,"abstract":"The DJOSER analytical thermal solver for multilayer mounting structures has been tested as a useful and friendly tool for the thermal analysis of power electronic devices and their packages, able to replace the onerous programs based on the finite element (FEM) calculations. The other problem connected with the packaging evaluation is the calculation of the thermally induced stresses and strains in the various layers composing the assembling structures. This paper deals with the first step of the implementation of a thermo-mechanical solver to be connected with the DJOSER program, which may be able to calculate the stresses at the layer interfaces, using the same strategy, i.e. a semi-analytical mathematical approach, and the same DJOSER structural constrains (stepped pyramidal structures, homogeneous layers). The basic theory is briefly exposed and the method is applied to some two-layers virtual structures. The obtained results are compared with those obtained using standard FEM analyses, revealing a substantial agreement but also some local disagreements.","PeriodicalId":414963,"journal":{"name":"2008 Second International Conference on Thermal Issues in Emerging Technologies","volume":"18 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134525813","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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