Influence of tip clearance on heat transfer efficiency in staggered  micro-cylinders-group

刘志刚

doi:10.3969/j.issn.0438-1157.2012.04.005

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Influence of tip clearance on heat transfer efficiency in staggered micro-cylinders-group

更新时间：2025-12-10

- Influence of tip clearance on heat transfer efficiency in staggered micro-cylinders-group
- CIESC Journal Issue 4, Pages: 1025-1031(2012)
- 作者机构：
  
  山东省科学院能源研究所,山东,济南
- 作者简介：
- 基金信息：
- DOI：10.3969/j.issn.0438-1157.2012.04.005
  CLC： K124
- Online First：05 April 2012，
  
  Published：05 April 2012
- 稿件说明：
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刘志刚. Influence of tip clearance on heat transfer efficiency in staggered micro-cylinders-group[J]. CIESC Journal, 2012, (4): 1025-1031.
DOI：

刘志刚. Influence of tip clearance on heat transfer efficiency in staggered micro-cylinders-group[J]. CIESC Journal, 2012, (4): 1025-1031. DOI： 10.3969/j.issn.0438-1157.2012.04.005.

摘要

以去离子水为工质，实验研究了直径为500 μm、高度为500 μm以叉排排列的微柱群内顶部缝隙对传热效率的影响规律。采用电加热棒进行加热，测量微柱群板Reynolds数在8～400之间在不同顶部缝隙时的进出口温度与流量，获得微柱群内流动阻力系数及Nusselt数，进而掌握微柱群内传热效率与Re关系。研究结果表明，在较低Re时，顶部缝隙对微柱群内流动阻力和Nu影响较小；随着Re增加，其对流动阻力与Nu的影响越来越显著。微柱群传热效率一开始随着Re增加而快速增加，随着Re进一步增加，其传热效率开始缓慢增加甚至出现下降。根据实验结果，尽管微柱群顶部缝隙存在降低了其内Nu，但提高了微柱群的传热效率。

Abstract

De-ionized water

used as working fluid

flows through a staggered micro-cylinders-group

which is made up of micro-cylinders with hydraulic diameter of 500 μm and height of 500 μm

and an experimental study is performed on the influence of tip clearance on heat transfer efficiency in the staggered micro-cylinders-group.Using an electricity heater

the flow rate and the temperature difference between the inlet and the outlet of micro-cylinders-group are measured and the friction factor and Nusselt numbers can be obtained over Reynolds numbers ranging from 8 to 400.The relationship between heat transfer efficiency and Reynolds number is grasped.The experimental results indicate that the tip clearance has a little influence on flow resistance and Nusselt number at low Reynolds number and these influences become apparent with the increase of Reynolds number.The heat transfer efficiency of micro-cylinders-group heat sink increases rapidly with Reynolds number for a start

and it increases slowly with the increase of Reynolds number

even begins to drop with the further increase of Reynolds number.However

the existence of the tip clearance promotes heat transfer efficiency in the micro-cylinders-group heat sink

though it reduces Nusselt number based on the experimental results.

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