2008 Second International Conference on Thermal Issues in Emerging Technologies最新文献

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The practical usefulness of various approaches to estimate heat spreading effects 评估热扩散效应的各种方法的实际用途
2008 Second International Conference on Thermal Issues in Emerging Technologies Pub Date : 1900-01-01 DOI: 10.1109/THETA.2008.5190977
C. Lasance
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引用次数: 5
Experimental study of convective heat transfer and pressure loss of SiO2/water nanofluids Part 1: Nanofluid characterization - Imposed wall temperature SiO2/水纳米流体对流换热和压力损失的实验研究。第1部分:纳米流体特性。施加的壁温
2008 Second International Conference on Thermal Issues in Emerging Technologies Pub Date : 1900-01-01 DOI: 10.1109/theta.2008.5167174
A. Bontemps, J. Ribeiro, S. Ferrouillat, J. Gruss, O. Soriano, Biran Wang
{"title":"Experimental study of convective heat transfer and pressure loss of SiO2/water nanofluids Part 1: Nanofluid characterization - Imposed wall temperature","authors":"A. Bontemps, J. Ribeiro, S. Ferrouillat, J. Gruss, O. Soriano, Biran Wang","doi":"10.1109/theta.2008.5167174","DOIUrl":"https://doi.org/10.1109/theta.2008.5167174","url":null,"abstract":"This paper describes an experimental study on the convective heat transfer of SiO2/water nanofluids inside a circular tube with imposed wall temperature. To our knowledge, very few papers have been published with temperature boundary conditions and none in cooling conditions. The experimental apparatus is described which allows us to measure local wall temperatures as well as fluid inlet/outlet temperatures. The flow regimes range from laminar to turbulent. The Reynolds and Nusselt numbers are deduced by using thermal conductivity and viscosity values measured with the same temperature conditions as those in the tests. The shear rate influence is also taken into account in the viscosity determination.The results indicate that the general trend of standard correlations is respected. However, the heat transfer coefficient values are higher than observed with pure water. An explanation is proposed.","PeriodicalId":414963,"journal":{"name":"2008 Second International Conference on Thermal Issues in Emerging Technologies","volume":"7 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124453093","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}
引用次数: 3
Optimal micro channel recuperators for small-sized gas turbines 小型燃气轮机的最佳微通道回热器
2008 Second International Conference on Thermal Issues in Emerging Technologies Pub Date : 1900-01-01 DOI: 10.1109/THETA.2008.5167160
M. Baelmans, F. Rogiers, J. Van Eyndhoven, W. Voets
{"title":"Optimal micro channel recuperators for small-sized gas turbines","authors":"M. Baelmans, F. Rogiers, J. Van Eyndhoven, W. Voets","doi":"10.1109/THETA.2008.5167160","DOIUrl":"https://doi.org/10.1109/THETA.2008.5167160","url":null,"abstract":"Thermodynamic efficiencies based on the first and second law of thermodynamics are assessed for their use in the design of recuperators in small-sized gas turbines. It is shown that the first and second law cycle efficiency as well as the Witte-Shamsundar efficiency for heat exchangers show a similar dependency on the heat exchanger pressure drops. This results in design relations for hydraulic diameter ratios and their related number of channels ratio. Further, it is shown that the Witte-Shamsundar efficiency focusing on heat exchanger inlet temperatures only can be used as a good approximation for the overall optimal recuperator design when also pressure drops over the recuperator are accounted for. However the approximation deteriorates with higher heat exchanger mass flow density and lower compressor ratio as well as with decreasing turbine inlet temperature ratio. Deviations from the full cycle efficiency considerations are assessed. It is concluded that the use of the Witte-Shamsundar efficiency for optimization of recuperators in small-sized applications like the 1.5 kW PowerMems gas turbine needs careful assessment.","PeriodicalId":414963,"journal":{"name":"2008 Second International Conference on Thermal Issues in Emerging Technologies","volume":"376 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116635351","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}
引用次数: 4
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