微针肋槽道内去离子水换热特性

刘东; 舒宇; 何蔚然; 胡安杰; 胥海伦

doi:10.11884/HPLPB201830.170397

微针肋槽道内去离子水换热特性

doi: 10.11884/HPLPB201830.170397

西南科技大学土木工程与建筑学院, 四川绵阳 621010

基金项目:

国家自然科学基金项目 51306156

国家自然科学基金项目 51606159

四川省教育厅科研项目 17ZA0405

详细信息

作者简介:
刘东(1984—)，男，博士，副教授，主要从事高热流密度器件冷却的研究；dtld123@126.com

中图分类号: TK124
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- 被引次数: 0
出版历程
- 收稿日期: 2017-10-10
- 修回日期: 2017-12-13
- 刊出日期: 2018-04-15

Heat transfer characteristics of mini pin-fin channels

School of Civil Engineering and Architecture, Southwest University of Science and Technology, Mianyang 621010, China

摘要

摘要: 设计了槽肋比为1:2和2:1的矩形大长宽比微针肋散热器，并实验研究了去离子水在其内的流动换热性能。结果表明：当进口温度为40 ℃、微针肋槽道在雷诺数小于650、最高壁面温度低于77 ℃时，单位面积散热量可达21.32 W/cm²。当雷诺数一定时，同一个槽道壁面温度沿着流动方向不断增加、同一个位置壁面温度随着加热功率的增加而增大，局部努谢尔数沿着流动方向先减小后逐渐增加并趋于定值。当针肋流动换热长度较长时，其入口效应可以忽略，槽道平均努谢尔数随着雷诺数的增大而增大，与加热功率无关；为了更好地表达微针肋槽道内的换热特性，考虑了槽肋比、流动雷诺数等影响，拟合了去离子水在微针肋槽道内的对流换热关系式。
- 激光器 /
- 微针肋槽道 /
- 热流 /
- 传热 /
- 去离子水
Abstract: The heat transfer performance of deionized water flowing in the large length/width ratio pin-fin micro channel was experimentally studied with two different ratios of channel to fin. The results show that, when the Reyonolds number is less than 650 and the inlet temperature is fixed at 40 ℃, the channel can achieve a heat dissipation of 21.32 W/cm² and the maximum wall temperature is below 77 ℃. The thermal properties of the channel can be summarized as follows for a fixed Reyonolds number: the wall temperature increases with the heating power and along with the flow direction; the local Nusselt number decreases along with the flow direction, then increases, and gradually tends to a fixed value. In the case of a long pin-fin channel, the entrance channel effect can be neglected, the average Nusselt number is independent with heating power, and only increases with Reyonolds number. Based on these results, a new correlation is proposed to evaluate heat transfer performance of pin-fins, which considers the Nusselt number as a function of the channel/fin ratio, Reyonolds number and Prandtl number.
- lasers /
- pin-fin microchannel /
- heat flux /
- heat transfer /
- water

HTML全文

图 1 实验系统图

Figure 1. Flow diagram of experiment system

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图 2 微针肋槽道对比图

Figure 2. Pin-fin micro-channel

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图 3 微针肋槽道实验段示意图

Figure 3. Schematic diagram of pin-fin microchannel experiment setup

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图 4 微针肋槽道整体封装图

Figure 4. Overall package diagram of pin-fin microchannels

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图 5 壁面温度沿流动长度变化关系

Figure 5. Variation of the wall temperature with flow length

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图 6 局部努谢尔数Nu_x随流动长度变化关系

Figure 6. Variation of Nu_x with flow length under different Re

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图 7 #2针肋槽道平均努谢尔数Nu_m随雷诺数Re变化关系

Figure 7. Variation of the average Nu_m with Re in microchannel #2

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图 8 实验数据和拟合公式数据误差分析

Figure 8. Error analysis between the experimental and fitted formulas

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表 1 微针肋槽道几何参数

Table 1. Geometric parameters of pin-fin micro-channel

pin-fins	fin number	channel width W/mm	fin width G/mm	fin height H/mm	pin-fins length L/mm
#1	5	1	2	4	200
#2	5	2	1	4	200

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表 2 实验相对误差

Table 2. Max error of experimental parameters

parameter	max error/%	parameter	max error/%
Q	2.4	D_i	2.0
h_x	6.9	Re	8.1
ΔT_m	5.8	Nu	8.2

下载: 导出CSV

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