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Heat Transfer: Volume 2最新文献

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Design of Thin-Film Thermoelectric Microcoolers 薄膜热电微冷却器的设计
Heat Transfer: Volume 2 Pub Date : 2000-11-05 DOI: 10.1115/imece2000-1446
D. Yao, C. Kim, G. Chen
{"title":"Design of Thin-Film Thermoelectric Microcoolers","authors":"D. Yao, C. Kim, G. Chen","doi":"10.1115/imece2000-1446","DOIUrl":"https://doi.org/10.1115/imece2000-1446","url":null,"abstract":"\u0000 Thin-film thermoelectric devices have potentially higher efficiency than bulk ones due to quantum and classical size effects of electrons and phonons. In this paper, we discuss the design of thin-film thermoelectric microcoolers for achieving high performance. The devices considered are membrane structures based on electron transport along the film plane. A model is developed to include the effects of heat loss and leg shape. Design optimization is performed based on the modeling results.","PeriodicalId":201774,"journal":{"name":"Heat Transfer: Volume 2","volume":"134 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2000-11-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121795172","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: 7
Thermal-Fluid Transport Phenomena in Concentric Annulus With Inner Core Rotation Under Strong Heating 强加热条件下具有内核旋转的同心环内热流体输运现象
Heat Transfer: Volume 2 Pub Date : 2000-11-05 DOI: 10.1115/imece2000-1405
S. Torii, Wen‐Jei Yang
{"title":"Thermal-Fluid Transport Phenomena in Concentric Annulus With Inner Core Rotation Under Strong Heating","authors":"S. Torii, Wen‐Jei Yang","doi":"10.1115/imece2000-1405","DOIUrl":"https://doi.org/10.1115/imece2000-1405","url":null,"abstract":"\u0000 A numerical study is performed to investigate thermal-fluid transport phenomena in a concentric annulus, in which an axially rotating inner cylinder and stationary outer cylinder are strongly heated under the same heat flux. The anisotropic t 2 ¯ -εt heat-transfer model is employed to determine thermal eddy diffusivity. When the inner cylinder is at rest, the turbulent kinetic energy and temperature variance over the whole cross-section in the flow and thermal fields substantially diminish along the flow, resulting in laminartization, i.e., a deterioration in heat transfer performance at the inner and outer cylinder walls. By contrast, a substantial reduction in the turbulent kinetic energy and temperature variance in the laminarzing flow are suppressed in the presence of inner core rotation. In other words, an inner core rotation contributes to a suppression of laminarization of the strongly heated gas flow.","PeriodicalId":201774,"journal":{"name":"Heat Transfer: Volume 2","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2000-11-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129847552","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: 0
Heat Transfer for Gaseous Flow in Microtubes With Viscous Heating 粘性加热微管中气体流动的传热研究
Heat Transfer: Volume 2 Pub Date : 2000-11-05 DOI: 10.1115/imece2000-1439
G. Tunc, Y. Bayazitoglu
{"title":"Heat Transfer for Gaseous Flow in Microtubes With Viscous Heating","authors":"G. Tunc, Y. Bayazitoglu","doi":"10.1115/imece2000-1439","DOIUrl":"https://doi.org/10.1115/imece2000-1439","url":null,"abstract":"\u0000 Convective heat transfer for steady state, laminar, hydrodynamically developed flow in microtubes with a boundary condition of constant temperature is solved by the integral transform technique. Temperature jump condition at the wall and viscous heating within the medium are included. For a given Brinkman number, at specified axial lengths, the viscous effects are presented for the developing range, reaching the fully developed Nusselt number. In previous studies without temperature jump condition at the wall, a 22% increase in the Nusselt number was found for Knudsen numbers ∈ [0,0.12]. In this work we have found that for the same range of Knudsen numbers, the Nusselt number decreases by 35.6%. In addition, as we increase the Prandtl number the temperature jump effect diminishes.","PeriodicalId":201774,"journal":{"name":"Heat Transfer: Volume 2","volume":"55 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2000-11-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122891567","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: 2
Radiation Effects on Natural Convection Between Horizontal Walls With Heated Upper Plate 辐射对上板受热水平壁面自然对流的影响
Heat Transfer: Volume 2 Pub Date : 2000-11-05 DOI: 10.1115/imece2000-1412
G. Guidotti, O. Manca, S. Nardini, B. Morrone
{"title":"Radiation Effects on Natural Convection Between Horizontal Walls With Heated Upper Plate","authors":"G. Guidotti, O. Manca, S. Nardini, B. Morrone","doi":"10.1115/imece2000-1412","DOIUrl":"https://doi.org/10.1115/imece2000-1412","url":null,"abstract":"\u0000 Radiation heat transfer affects natural convection of air inside an open ended cavity with a heated horizontal upper plate and an unheated lower parallel plate. The influence is mainly due to radiative heating of the lower plate, and plane fluid layer secondary motion could arise. In this paper an experimental study is carried out to describe and to detect the influence of radiation on air flow and on heat transfer coefficient by means of wall temperature profiles, smoke visualization, and air temperature measurements. The analysis is obtained for an emissivity of the horizontal plates equal to 0.8, for distances between the plates of 20.0, 32.3, and 40.0 mm. By means of flow visualization and local air temperature measurements in the cavity as a function of time, remarkable secondary motion in the cavity is observed when qΩ is equal to 120 W/m2. Measurement of the air temperature in the cavity also shows that radiation causes and damps secondary motion at the same time. Profiles of the mean value of the air temperature as a function of the x and y coordinates confirm both the main flow path inside the cavity and radiation effects on convective heat transfer. Finally, correlations related to average Nusselt number are proposed for natural convection as well as for heat transfer as a whole, that is convection along with radiation.","PeriodicalId":201774,"journal":{"name":"Heat Transfer: Volume 2","volume":"22 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2000-11-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123642178","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: 0
Unsteady Mixed Convection Over Spinning Isothermal Bodies With Blowing and Suction 具有吹风和吸力的旋转等温体上非定常混合对流
Heat Transfer: Volume 2 Pub Date : 2000-11-05 DOI: 10.1115/imece2000-1410
A. Öztürk, M. Ece
{"title":"Unsteady Mixed Convection Over Spinning Isothermal Bodies With Blowing and Suction","authors":"A. Öztürk, M. Ece","doi":"10.1115/imece2000-1410","DOIUrl":"https://doi.org/10.1115/imece2000-1410","url":null,"abstract":"\u0000 Initial development of the laminar thermal boundary-layer flow over an impulsively started translating and spinning axisymmetrical isothermal body with blowing and suction in the case of mixed convection is investigated. Velocity components and temperature are expanded in series in powers of the square root of time. Leading, first and second order functions are obtained analytically and the third, forth and fifth order functions are determined numerically. Application of the general results to a sphere shows that buoyancy driven aiding and opposing flows help surface suction in retarding and surface blowing in facilitating the onset of flow separation respectively. Surface heat flux is increased near the front stagnation point due to the axial inflow created by the body spin and enhanced by the circulating flow inside the separated region. Surface suction is found to increase the heat transfer while the surface blowing decreases it. Aiding and opposing flows increase the surface heat flux around the front and rear stagnation points respectively.","PeriodicalId":201774,"journal":{"name":"Heat Transfer: Volume 2","volume":"52 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2000-11-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127688078","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: 0
Mechanically Optimized Orientation of Intracellular Stress Fibers Under Cyclic Stretch 循环拉伸下细胞内应力纤维的机械优化取向
Heat Transfer: Volume 2 Pub Date : 2000-11-05 DOI: 10.1115/imece2000-1419
Hiroshi Yamada, T. Takemasa, Takami Yamaguchi
{"title":"Mechanically Optimized Orientation of Intracellular Stress Fibers Under Cyclic Stretch","authors":"Hiroshi Yamada, T. Takemasa, Takami Yamaguchi","doi":"10.1115/imece2000-1419","DOIUrl":"https://doi.org/10.1115/imece2000-1419","url":null,"abstract":"\u0000 To elucidate the orientation of stress fibers in a cultured endothelial cell under cyclic stretch, we hypothesized that a stress fiber aligns so as to minimize the summation of its length change under cyclic stretch, and that there is a limit in the sensitivity of cellular response to the mechanical stimulus. Results from numerical simulations based on the continuum mechanics describe the experimental observations under uniaxial stretch well. They give us an insight to the biological phenomenon of the orientation in stress fibers under biaxial stretch from the viewpoint of mechanical engineering.","PeriodicalId":201774,"journal":{"name":"Heat Transfer: Volume 2","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2000-11-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127702838","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: 0
Critical Heat Flux in Heated Horizontal Thin Annuli 加热水平薄环空的临界热流密度
Heat Transfer: Volume 2 Pub Date : 2000-11-05 DOI: 10.1115/imece2000-1432
R. Stoddard, M. F. Dowling, S. Abdel-Khalik, S. M. Ghiaasiaan, S. Jeter
{"title":"Critical Heat Flux in Heated Horizontal Thin Annuli","authors":"R. Stoddard, M. F. Dowling, S. Abdel-Khalik, S. M. Ghiaasiaan, S. Jeter","doi":"10.1115/imece2000-1432","DOIUrl":"https://doi.org/10.1115/imece2000-1432","url":null,"abstract":"\u0000 The objectives of the work reported here were to experimentally study the critical heat flux in a heated thin, horizontal, annular flow passage cooled by subcooled water and to examine the applicability and relevance of the current predictive methods for critical heat flux to such passages. Experiments were performed in the Georgia Tech Microchannel Test Facility (GTMTF). The test section was an annulus with 6.45 and 7.77 mm inner and outer diameters, respectively (0.66 mm gap width), and an 18.5-cm long heated section. The experimental parameters investigated covered the following ranges: test section exit pressure: 0.344–1.034 MPa; coolant (water) mass flux: 100–380 kg/m2s; wall heat flux: 0.231–1.068 MW/m2; water inlet temperature: 30–65°C.\u0000 The results, in agreement with the existing CHF data for large horizontal channels, indicated that CHF values were considerably lower than the expected CHF values for vertical test section configuration. In all the tests CHF occurred at relatively high equilibrium qualities, and was preceded by flow stratification which caused dryout of the upper surface of the flow channel. The data were correlated by introducing empirical correction multipliers into three widely-used correlations for vertical channels, and based on the compensated distortions method.","PeriodicalId":201774,"journal":{"name":"Heat Transfer: Volume 2","volume":"46 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2000-11-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131320736","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: 1
Determination of Flow and Heat-Transfer Parameters in Porous Media With Consideration of Density Variation of Working Fluid 考虑工质密度变化的多孔介质流动和传热参数的确定
Heat Transfer: Volume 2 Pub Date : 2000-11-05 DOI: 10.1115/imece2000-1426
W. Hsieh, W. Wu
{"title":"Determination of Flow and Heat-Transfer Parameters in Porous Media With Consideration of Density Variation of Working Fluid","authors":"W. Hsieh, W. Wu","doi":"10.1115/imece2000-1426","DOIUrl":"https://doi.org/10.1115/imece2000-1426","url":null,"abstract":"\u0000 An experimental investigation is conducted to determine the flow and heat-transfer parameters of porous media with the consideration of density-variation effect of the working fluid. The permeability (K), inertial coefficient (F), and local convective heat transfer coefficient (hloc) are determined for two types of metal screens at Reynolds numbers ranging from 20 to 400. A single-blow transient technique combined with a compressible non-local-thermal-equilibrium model determines the hloc. The compressible non-local-thermal-equilibrium model is also adopted in a Levenberg-Marquardt optimization technique for deducing the K and F from measured steady-state pressure drops at different flow rates. Results show that the permeability increases with the increase of the porosity. A set of empirical correlations is obtained for calculating the Nusselt number. Results also show that, under the test condition of this study, consideration of the density-variation effect would improve the accuracy in deducing the K, F, and hloc.","PeriodicalId":201774,"journal":{"name":"Heat Transfer: Volume 2","volume":"25 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2000-11-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129549696","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: 0
Scanning Thermal Microscopy of Carbon Nanotubes 碳纳米管的扫描热显微镜
Heat Transfer: Volume 2 Pub Date : 2000-11-05 DOI: 10.1115/imece2000-1453
Li Shi, S. Plyasunov, A. Bachtold, P. McEuen, A. Majumdar
{"title":"Scanning Thermal Microscopy of Carbon Nanotubes","authors":"Li Shi, S. Plyasunov, A. Bachtold, P. McEuen, A. Majumdar","doi":"10.1115/imece2000-1453","DOIUrl":"https://doi.org/10.1115/imece2000-1453","url":null,"abstract":"\u0000 This paper reports the use of scanning thermal microscopy (SThM) for studying heat dissipation and phonon transport in nanoelectronic circuits consisting of carbon nanotubes (CNs). Thermally designed and batch fabricated SThM probes were used to resolve the phonon temperature distribution in the CN circuits with a spatial resolution of 50 nm. Heat dissipation at poor metal-CN contacts could be readily found by the thermal imaging technique. Important questions regarding energy transport in nanoelectronic circuits, such as where is heat dissipated, whether the electrons and phonons are in equilibrium, how phonons are transported, and what are the effects of mechanical deformation on the transport and dissipation properties, are addressed in this work.","PeriodicalId":201774,"journal":{"name":"Heat Transfer: Volume 2","volume":"61 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2000-11-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114054589","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: 8
Scanning Thermal Wave Microscopy 扫描热波显微镜
Heat Transfer: Volume 2 Pub Date : 2000-11-05 DOI: 10.1115/imece2000-1451
O. Kwon, Li Shi, A. Miner, A. Majumdar
{"title":"Scanning Thermal Wave Microscopy","authors":"O. Kwon, Li Shi, A. Miner, A. Majumdar","doi":"10.1115/imece2000-1451","DOIUrl":"https://doi.org/10.1115/imece2000-1451","url":null,"abstract":"\u0000 This paper reports the development of a new technique for nanometer-scale thermal imaging and thermal property measurement — scanning thermal wave microscope (STWM). By raster scanning a sharp temperature-sensing probe the STWM measures the distribution of the phase lag and the amplitude of a thermal wave on the sample surface at a certain distance away from the heat source. As a benchmark experiment for this technique, the phase lag distribution of a thermal wave generated by a line heat source on a Pyrex glass sample was measured and compared with analytical solution. The effect of liquid film at the tip-sample contact on the measured phase lag was also studied. The ability of STWM to locate sub-surface heat source in a ULSI circuit was experimentally demonstrated.","PeriodicalId":201774,"journal":{"name":"Heat Transfer: Volume 2","volume":"61 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2000-11-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122648085","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: 10
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