Heat Transfer Enhancement in Micro-channel with Dimples and Protrusions

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Heat Transfer Enhancement in Micro-channel with Dimples and Protrusions

更新时间：2025-07-09

- Heat Transfer Enhancement in Micro-channel with Dimples and Protrusions
- Vol. 45, Issue 7, Pages: 89-94+111(2011)
- 作者机构：
  
  西安交通大学能源与动力工程学院,西安,710049
- 作者简介：
- 基金信息：
- DOI：
  CLC： V211.6
- Online First：10 July 2011，
  
  Published：2011
- 稿件说明：
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Heat Transfer Enhancement in Micro-channel with Dimples and Protrusions[J]. 2011, 45(7): 89-94+111.
DOI：

Heat Transfer Enhancement in Micro-channel with Dimples and Protrusions[J]. 2011, 45(7): 89-94+111. DOI：

摘要

为了解决微机电系统高热流密度的散热问题

采用数值方法对在宽度为50 μm、高度为200 μm的矩形截面微通道内布置球窝/球凸结构的传热特性进行了研究

通道的Re为100～900

流向间距为1.5到3.5倍的球窝直径

同时研究了球窝/球凸的叉排和顺排对微通道传热特性及流动规律的影响.结果表明:在微通道内布置球窝/球凸后

Nu与光滑微通道的Nu

比值为1.28～4.77

其数值基本和常规通道范围一致; 范宁摩擦系数f同光滑微通道的f

比值范围为1.11～2.04

上限与常规通道的一致

下限较之常规通道的小.随着Re的增加

Nu/Nu

和f/f

近似线性增加; 相同Re下

叉排的Nu/Nu

和f/f

大于顺排; 相同排列方式下

随着流向间距的减小

Nu/Nu

和f/f

增加.叉排的热性能明显优于顺排; 微通道中布置球窝/球凸的节能效果明显优于常规通道中布置球窝/球凸的情况.

Abstract

The heat transfer characteristics in a rectangular micro-channel with dimples/protrusions were numerically studied to solve the problem of high flux heat removal of MEMS. The height and the width of the micro-channel were 200 μm and 50 μm

respectively. The Reynolds number ranged from 100 to 900

and the stream wise pitch was 1.5-3.5 times the dimple diameter. The influences of aligned or staggered arrangement of dimples/protrusions on the heat transfer and flow characteristics were also investigated. The results show that the normalized Nusselt number(Nu/Nu

)in the micro-channel with dimples/protrusions ranges from 1.28 to 4.77

almost the same as that in conventional channels. The normalized Fanning friction f

actor(f/f

)is in the range from 1.11 to 2.04

whose upper limit and lower limit are the same as that and smaller than that in conventional channels with dimples/protrusions

respectively. Both Nu/Nu

and f/f

values increase approximately linearly with an increase in Reynolds numbered. At the same Reynolds number

both Nu/Nu

and f/f

values for the staggered arrangement are greater than those for the aligned arrangement. Both Nu/Nu

and f/f

values increase with the decrease in the stream wise pitch at the same arrangement of dimples/protrusions. The thermal performance for the staggered arrangement is higher than that for the aligned arrangement. These findings confirm that the energy saving for micro-channels with dimples/protrusions is greater than that for conventional channels with dimples/protrusions.

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references

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