Knowledge Management System Of Guangzhou Institute of Energy Conversion, CAS
| Numerical simulations of interrupted and conventional microchannel heat sinks | |
| Xu, Jinliang1; Song, Yanxi1,2; Zhang, Wei1; Zhang, Hua3; Gan, Yunhua4 | |
| 2008-12-01 | |
| Source Publication | INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
 |
| ISSN | 0017-9310 |
| Volume | 51Issue:25-26Pages:5906-5917 |
| Corresponding Author | xujl@ms.giec.ac.cn |
| Abstract | We provide three-dimensional numerical simulations of conjugate heat transfer in conventional and the newly proposed interrupted microchannel heat sinks. The new microchannel heat sink consists of a set of separated zones adjoining shortened parallel microchannels and transverse microchambers. Multi-channel effect, physical property variations, and axial thermal conduction are considered. It is found that flow rate variations in different channels can be neglected, while heat received by different channels accounts for 2% deviations from the averaged value when the heat flux at the back surface of the silicon chip reaches 100 W/cm(2). The computed hydraulic and thermal boundary layers are redeveloping in each separated zone due to shortened flow length for the interrupted microchannel heat sink. The periodic thermal developing flow is responsible for the significant heat transfer enhancement. Two effects influence pressure drops across the newly proposed microchannel heat sink. The first one is the pressure recovery effect in the microchamber, while the second one is the head loss when liquid leaves the microchamber and enters the next zone. The first effect compensates or suppresses the second one, leading to similar or decreased pressure drop than that for the conventional microchannel heat sink, with the fluid Prandtl number larger than unity. (c) 2008 Elsevier Ltd. All rights reserved. |
| Subtype | Article |
| Other Abstract | We provide three-dimensional numerical simulations of conjugate heat transfer in conventional and the newly proposed interrupted microchannel heat sinks. The new microchannel heat sink consists of a set of separated zones adjoining shortened parallel microchannels and transverse microchambers. Multi-channel effect, physical property variations, and axial thermal conduction are considered. It is found that flow rate variations in different channels can be neglected, while heat received by different channels accounts for 2% deviations from the averaged value when the heat flux at the back surface of the silicon chip reaches 100 W/cm(2). The computed hydraulic and thermal boundary layers are redeveloping in each separated zone due to shortened flow length for the interrupted microchannel heat sink. The periodic thermal developing flow is responsible for the significant heat transfer enhancement. Two effects influence pressure drops across the newly proposed microchannel heat sink. The first one is the pressure recovery effect in the microchamber, while the second one is the head loss when liquid leaves the microchamber and enters the next zone. The first effect compensates or suppresses the second one, leading to similar or decreased pressure drop than that for the conventional microchannel heat sink, with the fluid Prandtl number larger than unity. |
| Keyword | Numerical Simulation Microchannel Heat Sink Heat Transfer Enhancement Pressure Drop Reduction |
| WOS Headings | Science & Technology ; Physical Sciences ; Technology |
| DOI | 10.1016/j.ijheatmasstransfer.2008.05.003 |
| WOS Subject Extended | Thermodynamics ; Engineering ; Mechanics |
| URL | 查看原文 |
| WOS Keyword | SINGLE-PHASE FLOW ; VISCOUS DISSIPATION |
| Indexed By | SCI |
| Language | 英语 |
| Funding Organization | National Natural Science Foundation of China [50476088]; Shanghai key discipline project [T0503] |
| WOS Subject | Thermodynamics ; Engineering, Mechanical ; Mechanics |
| WOS ID | WOS:000261628800019 |
| Citation statistics | |
| Document Type | 期刊论文 |
| Identifier | http://ir.giec.ac.cn/handle/344007/3400 |
| Collection | 中国科学院广州能源研究所 |
| Affiliation | 1.Chinese Acad Sci, Guangzhou Inst Energy Convers, Key Lab Renewable Energy & Gas Hydrate, Micro Energy Syst Lab, Guangzhou 510640, Peoples R China 2.Chinese Acad Sci, Grad Sch, Beijing 100080, Peoples R China 3.Shanghai Univ Sci & Technol, Inst Refrigerat & Cryogen, Shanghai 201800, Peoples R China 4.S China Univ Technol, Sch Elect Power, Guangzhou 510641, Peoples R China |
| Recommended Citation GB/T 7714 | Xu, Jinliang,Song, Yanxi,Zhang, Wei,et al. Numerical simulations of interrupted and conventional microchannel heat sinks[J]. INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER,2008,51(25-26):5906-5917. |
| APA | Xu, Jinliang,Song, Yanxi,Zhang, Wei,Zhang, Hua,&Gan, Yunhua.(2008).Numerical simulations of interrupted and conventional microchannel heat sinks.INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER,51(25-26),5906-5917. |
| MLA | Xu, Jinliang,et al."Numerical simulations of interrupted and conventional microchannel heat sinks".INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER 51.25-26(2008):5906-5917. |
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