微针肋内潜热型功能热流体换热特性研究

刘东; 李佳蓬; 何蔚然; 胡安杰; 蒋斌

doi:10.11884/HPLPB201830.180177

微针肋内潜热型功能热流体换热特性研究

doi: 10.11884/HPLPB201830.180177

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

西南科技大学博士基金项目 11zx7106

详细信息

作者简介:
刘东(1984—), 男, 副教授, 博士, 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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出版历程
- 收稿日期: 2018-06-25
- 修回日期: 2018-09-21
- 刊出日期: 2018-11-15

Heat transfer characteristics of latent functionally thermal fluid flows in the pin-fin Micro channels

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

摘要

摘要: 引入潜热型功能热流体替换现有传统工质冷却大功率激光器，实验研究了潜热型功能热流体与传统工质去离子水在高4 mm、宽2 mm、间距1 mm的微针肋内的层流流动换热特性。结果表明：在雷诺数Re为625~1125范围内，潜热型功能热流体均表现出比水更好的冷却性能及更低的壁面温度，且存在最佳的质量分数值；相同工况下，潜热型功能热流体平均努谢尔数Nu大于去离子水，平均努谢尔数Nu随着雷诺数Re的增加而增加。拟合了平均努谢尔数与流体雷诺数、普朗特数、质量分数的经验的关系式，最大偏差为16.9%，可以较好反映潜热型功能热流体的换热特性；潜热型功能热流体沿着流动长度的方向存在一个稳定的局部换热强化区，且强化换热存在最佳的长度。
- 潜热型功能热流体 /
- 冷却 /
- 微针肋 /
- 强化传热 /
- 努谢尔数
Abstract: In view of the cooling problem of high power lasers, the existing traditional working fluids are replaced by the latent functionally thermal fluid. The laminar flow and heat transfer characteristics of the latent heat functionally thermal fluid and that of deionized water in a piece of pin-fin micro channels with height of 4 mm, width 2 mm and spacing 1 mm were experimentally studied. The results show that when Reynolds Number ranges 625-1125, the latent functionally thermal fluid shows better cooling performance and lower wall temperature than the deionized water, and it has an optimum concentration value; Its average Nusselt number is greater than that of the deionized water, and the average Nusselt number increases with the Reynolds number. To clearly demonstrate the relationship between the average Nusselt number, Reynolds number, mass concentration and Prandtl number, an experimental formula was further fitted based on the experimental data, the maximum relative deviation is 16.9%, which is acceptable for experiments. Along the length in the direction of flow, there exists an optimal length for a stable local heat transfer enhancement section.
- latent functionally thermal fluid /
- cooling /
- pin-fin microchannels /
- enhanced heat transfer /
- Nusselt Number

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图 1 实验系统图

Figure 1. The flow diagram of experiment system

1-temperture sink; 2-pump; 3-pulsate absorber; 4-valve; 5-rotameter; 6-test section; 7-data section; 8-PC; 9-heat source

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图 2 微针肋实验段

Figure 2. The pin-fin microchannels

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图 3 潜热型功能热流体显微镜图

Figure 3. Microscopic image of latent functionally thermal fluid(LFTF)

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图 4 相变微胶囊电镜图

Figure 4. Electronic microscopic image of MEPCM

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图 5 不同雷诺数下在不同质量分数下，量纲Ⅰ壁面温度随流动长度变化关系

Figure 5. Temperature variation of the dimension wall I with flow length under different Re and mass fraction

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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 the Nu_x with flow length under different mass fraction

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图 7 在不同质量分数下，平均努谢尔数Nu随雷诺数Re变化关系

Figure 7. Variation of the mean Nu_m with Re under differnet mass fraction

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图 8 实验数据和拟合公式数据误差分析

Figure 8. The error analysis between the experimental data and fitted formula data

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图 9 不同质量分数情况下，局部换热强化比η_x随流动长度变化规律

Figure 9. Variation of the local heat transfer enhancement ratio with flow length under different mass fraction

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表 1 潜热型功能热流体相关热物性参数

Table 1. The parameters of MEPCM

thermal fluid	density/(kg·m^-3)	thermal conductivity/(W·m^-1·℃^-1)	viscosity/(10^-3Pa·s)	latent heat/(J·g^-1)
water(40 ℃)	992.2	0.634	0.656	—
PCM	1100	0.162	—	100
5%	997	0.606	0.741	—
10%	1002	0.578	0.856
15%	1007	0.551	1.015	—

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表 2 实验不确定度

Table 2. Uncertainties of experiment

parameter	uncertainty/%	parameter	uncertaintty/%
Q	2.4	Re	8.1
ΔT_m	5.8	h_m	6.9
k_b	5	Nu_m	8.2
u_b	5

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