| 尺度效应对低Reynolds数下微/小柱群通道内对流换热的影响 |
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| 引用本文： | 刘志刚,张承武,管宁,王建梅.尺度效应对低Reynolds数下微/小柱群通道内对流换热的影响[J].中国电力,2011,62(7):1852-1859. |
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| 作者姓名： | 刘志刚 张承武 管宁 王建梅 |
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| 作者单位： | 山东省科学院能源研究所 |
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| 基金项目： | 国家自然科学基金项目，山东省自然科学基金项目 |
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| 摘 要： | De-ionized water，used as working fluid，flows through in-line and staggered array micro/mini-cylinders-group plates with 5.2 mm width and 40 mm length，which are made up of micro-cylinders with hydraulic diameter of 0. 5 mm and heights of 0.5 mm，0.75 mm and 1.0 mm respectively，and the influence of dimension effect on forced convective heat transfer characteristics is studied experimentally. Using an electricity heater，the flow rate and the temperature difference between the inlet and the outlet of micro/mini-cylinders-group are measured and the Nusselt numbers are obtained over low Reynolds numbers ranging from 8 to 100. The experimental results indicate that the Nusselt number for H = 0.5 mm is less than that of classical correlation and it is also less than the Nusselt number for H = 0.75 mm and H =1.0 mm due to the appearance of the sluggish regions in micro/mini cylinders and combined effect of conjugate heat transfer，endwall effect，variation of thermophysical properties with temperature， etc . With the increase of Reynolds number，the Nusselt number of micro/mini-cylinders-group with height of 0.5 mm rapidly increases and it is larger than that with height of 0. 75 mm and 1.0 mm. For Re >20，
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| 关 键 词： | 微/小柱群 低Reynolds数 尺度效应 对流换热 滞流区 |
Influence of dimension effect on convective beat transfer in micro/mini-cylinders-group at low Reynolds number |
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| LIU Zhigang,ZHANG Chengwu,GUAN Ning,WANG Jianmei.Influence of dimension effect on convective beat transfer in micro/mini-cylinders-group at low Reynolds number[J].Electric Power,2011,62(7):1852-1859. |
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| Authors: | LIU Zhigang ZHANG Chengwu GUAN Ning WANG Jianmei |
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