微柱体对微通道热沉综合性能影响的数值分析

为强化微通道热沉的传热性能,设计一种内置微柱体的微通道热沉,并采用数值方法研究微柱体对微通道热沉内流体流动、传热及综合性能的影响。分析了进口雷诺数、微柱体的错位量对内置微柱体微通道热沉（微柱通道）的压降、热阻和努塞尔数的影响,并与光滑微通道热沉（光滑通道）进行对比。采用热阻与泵功的关系、熵产原则及性能评价准则对微通道热沉的综合性能进行评价。结果表明,微柱通道压降和努塞尔数随雷诺数增大而增大,热阻反而减小;在研究的雷诺数范围内,微柱通道压降比光滑通道的平均高84.3%,热阻平均低27.8%,而努塞尔数平均高54.5%;有错位量的微柱通道热阻比无错位量的平均低8.9%,而努塞尔数平均高12.6%;...

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Bibliographic Details
Published in中国石油大学学报（自然科学版） Vol. 41; no. 3; pp. 122 - 128
Main Author 冯振飞 罗小平 郭峰 李海燕 王兆涛
Format Journal Article
LanguageChinese
Published 广西大学广西石化资源加工及过程强化技术重点实验室,广西南宁530004%华南理工大学机械与汽车工程学院,广东广州,510641 2017
华南理工大学机械与汽车工程学院,广东广州510641
Subjects
传热
微柱体
微通道
数值模拟
流动
micro-channel
微柱体
传热
流动
数值模拟
micro-cylinder
heat transfer
微通道
numerical simulation
flow
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ISSN1673-5005
DOI10.3969/j.issn.1673-5005.2017.03.015

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Summary:为强化微通道热沉的传热性能,设计一种内置微柱体的微通道热沉,并采用数值方法研究微柱体对微通道热沉内流体流动、传热及综合性能的影响。分析了进口雷诺数、微柱体的错位量对内置微柱体微通道热沉（微柱通道）的压降、热阻和努塞尔数的影响,并与光滑微通道热沉（光滑通道）进行对比。采用热阻与泵功的关系、熵产原则及性能评价准则对微通道热沉的综合性能进行评价。结果表明,微柱通道压降和努塞尔数随雷诺数增大而增大,热阻反而减小;在研究的雷诺数范围内,微柱通道压降比光滑通道的平均高84.3%,热阻平均低27.8%,而努塞尔数平均高54.5%;有错位量的微柱通道热阻比无错位量的平均低8.9%,而努塞尔数平均高12.6%;微柱通道综合性能优于光滑通道,且有错位量的微柱通道更优。
Bibliography:micro-channel; micro-cylinder; numerical simulation; flow; heat transfer
FENG Zhenfei1,2,LUO Xiaoping1,GUO Feng1,LI Haiyan1,WANG Zhaotao1（1. School of Mechanical and Automotive Engineering,South China University of Technology,Guangzhou 510641,China; 2. Guangxi Key Laboratory of Petrochemical Resource Processing and Process Intensification Technology,Guangxi University,Nanning 530004, China）
In order to enhance the heat transfer perfor^mance of micro-channel heat sinks,a micro-channel heat sink with mi-cro-cylinders is presented and the effects of micro-cylinders on the fluid flow,heat transfer and overall performance in the mi-cro-channel heat sinks are studied numerically. The effects of the inlet Reynolds number and micro-cylinder offset value on the pressure drop,thermal resistance and Nusselt number are analyzed,and these results are compared with those of the plain micro-channel heat sink. Then the overall performance on the micro-channel heat sink is evaluated by using the thermal resistance-pumping power
ISSN:1673-5005
DOI:10.3969/j.issn.1673-5005.2017.03.015