发布求助
文献互助 智能选刊 最新文献

Heat Transfer: Volume 2最新文献

筛选
英文 中文
An Interdisciplinary Approach to Brain Tumor Growth Dynamics 脑肿瘤生长动力学的跨学科研究
Heat Transfer: Volume 2 Pub Date : 2000-11-05 DOI: 10.1115/imece2000-1415
S. Torquato, T. Deisboeck
{"title":"An Interdisciplinary Approach to Brain Tumor Growth Dynamics","authors":"S. Torquato, T. Deisboeck","doi":"10.1115/imece2000-1415","DOIUrl":"https://doi.org/10.1115/imece2000-1415","url":null,"abstract":"\u0000 Intensive medical research over the last fifty years has left the prognosis for patients diagnosed with malignant brain tumors nearly unchanged. This suggests that a new perspective on the problem may offer important insight. We have undertaken an interdisciplinary research program, seeking to study brain tumors as complex systems. This research aims to develop computational models coupled with experimental assays to investigate the hypothesis of self-organizing behavior in tumor systems. Preliminary assays have revealed behavior consistent with this hypothesis. A cellular-automaton model to study the growth of the tumor core has been developed. This model has proven successful in reproducing macroscopic tumor growth from a limited parameter set. Further, it has been applied to investigate the importance of heterogeneity to determination of a clinical prognosis and has demonstrated the importance of understanding clonal composition in making an accurate prognosis.","PeriodicalId":201774,"journal":{"name":"Heat Transfer: Volume 2","volume":"31 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":"115852620","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
Direct Refrigeration by Electron Field Emission From Diamond Microtips 金刚石微针尖电子场发射直接制冷技术
Heat Transfer: Volume 2 Pub Date : 2000-11-05 DOI: 10.1115/imece2000-1443
T. Fisher, D. G. Walker
{"title":"Direct Refrigeration by Electron Field Emission From Diamond Microtips","authors":"T. Fisher, D. G. Walker","doi":"10.1115/imece2000-1443","DOIUrl":"https://doi.org/10.1115/imece2000-1443","url":null,"abstract":"\u0000 This paper describes a concept for creating high-capacity, direct electrical-to-thermal energy conversion for compact cooling based on electron field emission. Electron field emission involves the transport of electrons that tunnel through a potential barrier. The thermodynamics of field emission have remained relatively unexplored. However, emission from wide-band-gap semiconductors, such as diamond, is known to produce an energy filtering effects such that high-energy electrons possess higher probabilities of emission. Lower energy electrons replace the emitted electrons, and thus, this process can produce a refrigeration effect. The refrigeration capacity is proportional to the emission current density, which is very high for diamond emitters. This high electrical current density implies that high thermal current densities are possible. The present work provides a thermodynamic analysis and energy conversion predictions based on experimental current-voltage data from diamond tip emitters. Energy fluxes in excess of 100 W/cm2 are predicted by the theory for room-temperature operation.","PeriodicalId":201774,"journal":{"name":"Heat Transfer: Volume 2","volume":"16 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":"121386921","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
Design, Fabrication and Heat Transfer Analysis of a Mesoscopic Pulse Tube as an Integrated Micro-Refrigeration System 介观脉冲管集成微制冷系统的设计、制造及传热分析
Heat Transfer: Volume 2 Pub Date : 2000-11-05 DOI: 10.1115/imece2000-1442
N. Shinde, R. Bashir, E. Groll, G. Chiu
{"title":"Design, Fabrication and Heat Transfer Analysis of a Mesoscopic Pulse Tube as an Integrated Micro-Refrigeration System","authors":"N. Shinde, R. Bashir, E. Groll, G. Chiu","doi":"10.1115/imece2000-1442","DOIUrl":"https://doi.org/10.1115/imece2000-1442","url":null,"abstract":"\u0000 The phenomenon of surface heat pumping has been widely used to accomplish refrigeration in macro-scale devices such as pulse-tubes and thermo-acoustic devices. Pulse tube refrigerators are typically used to lift heat at cryogenic temperatures. The advantage of a pulse tube as a no moving part device makes it amenable to miniaturization at dimensional scales where areal effects, such as friction and viscosity, dominate. In this paper, the design and preliminary fabrication results of such a device to investigate the effect of surface heat pumping in mesoscopic glass channels are presented.","PeriodicalId":201774,"journal":{"name":"Heat Transfer: Volume 2","volume":"23 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":"134574653","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
On the Optimal Configuration of Three Cylinders in a Row Cooled by a Slot Jet of Air 狭缝射流冷却三圆柱排的优化结构研究
Heat Transfer: Volume 2 Pub Date : 2000-11-05 DOI: 10.1115/imece2000-1406
F. Gori, L. Bossi
{"title":"On the Optimal Configuration of Three Cylinders in a Row Cooled by a Slot Jet of Air","authors":"F. Gori, L. Bossi","doi":"10.1115/imece2000-1406","DOIUrl":"https://doi.org/10.1115/imece2000-1406","url":null,"abstract":"\u0000 The optimal positions of three circular cylinders, cooled by a slot jet of air, are investigated. The diameters of the three cylinders are the same, D = 10 mm, while the slot jet has an height of S = 5 mm. The first cylinder is set up at a distance, H, from the slot exit, H/S = 6, which is the optimum in a one cylinder configuration. The second cylinder is set up at a distance from the first one, L1, with L1/S = 4, which is the optimum when two cylinders are present. The optimal distance of the third cylinder from the second one is L2, such that L2/S = 4, and the mean heat transfer coefficient on the third cylinder is at the maximum value. Local heat transfer coefficients on the surface of the third cylinder varies with L2/S. Measurements of axial velocity and turbulence intensity, in the axial direction, accompany the heat transfer results.","PeriodicalId":201774,"journal":{"name":"Heat Transfer: Volume 2","volume":"39 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":"116196299","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: 5
Two Dimensional Simulations of Enhanced Heat Transfer in an Intermittently Grooved Channel 间隙沟槽通道强化传热的二维模拟
Heat Transfer: Volume 2 Pub Date : 2000-11-05 DOI: 10.1115/1.1459730
M. Greiner, P. Fischer, H. Tufo
{"title":"Two Dimensional Simulations of Enhanced Heat Transfer in an Intermittently Grooved Channel","authors":"M. Greiner, P. Fischer, H. Tufo","doi":"10.1115/1.1459730","DOIUrl":"https://doi.org/10.1115/1.1459730","url":null,"abstract":"\u0000 Two-dimensional Navier-Stokes simulations of heat and momentum transport in an intermittently grooved passage are performed using the spectral element technique for the Reynolds number range 600 ≤ Re ≤ 1800. The computational domain has seven contiguous transverse grooves cut symmetrically into opposite walls, followed by a flat section with the same length. Periodic inflow/outflow boundary conditions are employed. The development and decay of unsteady flow is observed in the grooved and flat sections, respectively. The axial variation of the unsteady component of velocity is compared to the local heat transfer, shear stress and pressure gradient. The results suggest that intermittently grooved passages may offer even higher heat transfer for a given pumping power than the levels observed in fully grooved passages.","PeriodicalId":201774,"journal":{"name":"Heat Transfer: Volume 2","volume":"10 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":"125196659","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: 27
Average Heat Transfer Coefficient Measurements in a Fuel Bundle: Method Development 燃料束平均传热系数的测量:方法发展
Heat Transfer: Volume 2 Pub Date : 2000-11-05 DOI: 10.1115/imece2000-1424
M. Armfield, H. M. Langford, D. E. Beasley, M. Conner
{"title":"Average Heat Transfer Coefficient Measurements in a Fuel Bundle: Method Development","authors":"M. Armfield, H. M. Langford, D. E. Beasley, M. Conner","doi":"10.1115/imece2000-1424","DOIUrl":"https://doi.org/10.1115/imece2000-1424","url":null,"abstract":"\u0000 Measurement of single-phase heat transfer rates in a laboratory-scale rod bundle can aid in the design of a full-scale nuclear fuel bundle. It is desirable to obtain heat transfer coefficient measurements as a function of axial position with a high degree of measurement confidence. To achieve this goal, a heated calorimeter is designed and instrumented to measure power input and temperature. Temperature measurement is accomplished using thermocouples embedded in the calorimeter material, and a cartridge heater inserted concentrically in the calorimeter material creates a constant heat flux. The present study examines the contributions of the design parameters and uncertainties in the measurements to the overall uncertainty in the heat transfer coefficient. A design stage uncertainty analysis allows prediction of the required uncertainty in temperature difference measurement to achieve a desired uncertainty in the heat transfer coefficient. The experimental design for differential temperature calibration and representative uncertainty results are presented. All significant contributions to the total uncertainty in heat transfer coefficient are described and quantified.","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":"123296787","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 Implications in the First MEMS Fabricated Thermal Transpiration-Driven Vacuum Pump for Gases 第一个MEMS制造的热蒸腾驱动气体真空泵的传热意义
Heat Transfer: Volume 2 Pub Date : 2000-11-05 DOI: 10.1115/imece2000-1440
S. Vargo, Amanda A. Green, E. Muntz
{"title":"Heat Transfer Implications in the First MEMS Fabricated Thermal Transpiration-Driven Vacuum Pump for Gases","authors":"S. Vargo, Amanda A. Green, E. Muntz","doi":"10.1115/imece2000-1440","DOIUrl":"https://doi.org/10.1115/imece2000-1440","url":null,"abstract":"\u0000 The success of NASA’s future space missions and the development of portable, commercial instrument packages will depend greatly on miniaturized components enabled by the use of microelectromechanical systems (MEMS). Both of these application markets for miniaturized instruments are governed by the use of MEMS components that satisfy stringent power, mass, volume, contamination and integration requirements. An attractive MEMS vacuum pump for instruments requiring vacuum conditions is the Knudsen Compressor, which operates based on the rarefied gas dynamics phenomenon of thermal transpiration. Thermal transpiration describes the regime where gas flows can be induced in a system by maintaining temperature differences across porous materials under rarefied conditions. This pumping mechanism provides two overwhelmingly attractive features as a miniature vacuum pump — no moving parts and no working fluids or lubricants. Due to favorable power, volume and mass estimates a Knudsen Compressor fabricated using MEMS fabrication techniques (lithography, deep reactive ion etching) and new materials (silicon, aerogel) has been completed. The experimental testing of this MEMS Knudsen Compressor device’s thermal and pumping performance are outlined in this manuscript. Good agreement between experiments and numerical predictions using a transitional flow analysis have also been obtained although simple simulations based on the aerogel’s structure are difficult to perform.","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":"114983628","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
Anisotropic Thermal Conductivity of a Si/Ge Quantum Dot Superlattice Si/Ge量子点超晶格的各向异性热导率
Heat Transfer: Volume 2 Pub Date : 2000-11-05 DOI: 10.1115/imece2000-1450
T. Borca-Tasciuc, Weili Liu, Jianlin Liu, Kang L. Wang, Gang Chen
{"title":"Anisotropic Thermal Conductivity of a Si/Ge Quantum Dot Superlattice","authors":"T. Borca-Tasciuc, Weili Liu, Jianlin Liu, Kang L. Wang, Gang Chen","doi":"10.1115/imece2000-1450","DOIUrl":"https://doi.org/10.1115/imece2000-1450","url":null,"abstract":"\u0000 In this work, we present experimental results on the in-plane and cross-plane thermal conductivity characterization of a Si/Ge quantum-dots superlattice structure. The quantum-dots superlattice was grown by molecular-beam-epitaxy and self-organization. The anisotropic thermal conductivity measurements are performed by a differential two-wire 3ω method. The measured in-plane and cross-plane thermal conductivity values show a different temperature behavior. The results are compared and explained with heat transport models in superlattices.","PeriodicalId":201774,"journal":{"name":"Heat Transfer: Volume 2","volume":"107 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":"132422917","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 and Pressure Drop of CO2 Flow Boiling in Microchannels 微通道内CO2流动沸腾的传热与压降
Heat Transfer: Volume 2 Pub Date : 2000-11-05 DOI: 10.1115/imece2000-1433
Yuan Zhao, M. Molki, M. Ohadi
{"title":"Heat Transfer and Pressure Drop of CO2 Flow Boiling in Microchannels","authors":"Yuan Zhao, M. Molki, M. Ohadi","doi":"10.1115/imece2000-1433","DOIUrl":"https://doi.org/10.1115/imece2000-1433","url":null,"abstract":"\u0000 An experimental investigation was performed to study the flow boiling heat transfer of CO2 in microchannels. Tests were conducted in a horizontal triangular microchannel with the hydraulic diameter of 0.86 mm. Heat to the test section was provided by direct electrical heating. Experiments were conducted with CO2 at saturation temperatures of 273 to 293 K, mass fluxes of 100 to 820 kg/m2s, heat fluxes of 3 to 23 kW/m2, and qualities of 20% to 85%. It was demonstrated that heat flux had an enhancing effect on the heat transfer coefficient, while mass flux had a negligible effect. Nucleate boiling mechanism is found to be the dominant factor for CO2 flow boiling in microchannels. Heat transfer coefficient degraded quickly at high vapor quality region (0.6–0.7), which is possibly due to flow mal-distribution. Pressure drop increases slightly with vapor quality and/or heat flux. Mass flux has a strong increasing effect on pressure drop.","PeriodicalId":201774,"journal":{"name":"Heat Transfer: Volume 2","volume":"108 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":"131358300","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: 6
The Effect of Radiation on Turbulent Convective Heat Transfer Over an Ablating Solid 辐射对烧蚀固体湍流对流换热的影响
Heat Transfer: Volume 2 Pub Date : 2000-11-05 DOI: 10.1115/imece2000-1407
K. Akyuzlu, A. Antoniou, R. Kagoo
{"title":"The Effect of Radiation on Turbulent Convective Heat Transfer Over an Ablating Solid","authors":"K. Akyuzlu, A. Antoniou, R. Kagoo","doi":"10.1115/imece2000-1407","DOIUrl":"https://doi.org/10.1115/imece2000-1407","url":null,"abstract":"\u0000 A numerical study is conducted to investigate the effect of thermal radiation on turbulent flow (upstream of the flame front) inside a subscale planar hybrid rocket motor. The physical model adopted for the study is based on an unsteady two-domain (solid fuel and gaseous oxidizer) concept where both domains are assumed to be two-dimensional. Furthermore, the oxidizer gas flow is assumed to be incompressible and turbulent with boundary layer approximations. The radiative heat transfer is incorporated to the energy equation for the oxidizer using the Rosseland diffusion approximation. Fuel is assumed to be a nontransparent isotropic solid. The two domains are coupled through an energy balance at the interface that includes heat transfer due to radiation, conduction, and ablation. The solution to the governing differential equations of the present model is obtained by first linearizing the equations using Newton linearization method, discretizing them by a fully implicit finite-difference technique, and then solving the resulting set of algebraic equations by a block tridiagonal matrix solver. Finally, the proposed mathematical model is used in a parametric study to determine the effect of various operational parameters, such as flame temperature and oxidizer mass flow rate, on heat transfer from the solid fuel. Results indicate the significance of radiation on turbulent convective heat transfer over an ablating solid.","PeriodicalId":201774,"journal":{"name":"Heat Transfer: Volume 2","volume":"89 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":"133592393","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
首页 上一页 下一页 尾页
0
×
引用
GB/T 7714-2015
复制
MLA
复制
APA
复制
导出至
BibTeX EndNote RefMan NoteFirst NoteExpress
×
提示
您的信息不完整，为了账户安全，请先补充。
现在去补充
×
提示
您因"违规操作"
具体请查看互助需知
我知道了
×
提示
现在去查看 取消
×
提示
确定
请完成安全验证×
相关产品
×
本文献相关产品
联系我们：info@booksci.cn Book学术提供免费学术资源搜索服务，方便国内外学者检索中英文文献。致力于提供最便捷和优质的服务体验。 Copyright © 2023 布克学术 All rights reserved.
京ICP备2023020795号-1
ghs 京公网安备 11010802042870号
Book学术文献互助
Book学术文献互助群
群 号：604180095
Book学术官方微信