垂直微柱蒸发器干涸阈值模型求解及尺寸优化

高申宝; 焦凤; 何永清

doi:10.13224/j.cnki.jasp.20220723

垂直微柱蒸发器干涸阈值模型求解及尺寸优化

doi: 10.13224/j.cnki.jasp.20220723

高申宝^1,,
焦凤^1,*, ,,
何永清²

1.
昆明理工大学化学工程学院，昆明 650500
2.
重庆工商大学国家智能制造服务国际科技合作基地微纳系统与智能传感重庆市重点实验室，重庆 400067

基金项目: 国家自然科学基金（52366005）；四川省科技创新人才项目（22CXRC0151）

详细信息

作者简介:
高申宝（1998-），男，硕士生，主要从事微纳尺度传热方面的研究。E-mail：1780729420@qq.com

通讯作者:
焦凤（1986-），女，副教授，博士，主要从事微通道内流体流动与强化传热方面的研究。E-mail：jiaofeng0526@163.com

中图分类号: V231.1；TK124
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- 被引次数: 0
出版历程
- 收稿日期: 2022-09-25
- 网络出版日期: 2024-02-29

Model solving and size optimization of dryout threshold for vertical micropillar evaporators

GAO Shenbao^1
,,
JIAO Feng^{1,*
, ,},
HE Yongqing²

1.
Faculty of Chemical Engineering，Kunming University of Science and Technology，Kunming 650500，China
2.
Chongqing Key Laboratory of Micro-Nano System and Intelligent Transduction，National Research Base of Intelligent Manufacturing Service，Chongqing Technology and Business University，Chongqing 400067，China

摘要

摘要:
对现有干涸阈值模型进行优化，加入重力的影响，并与毛细作用力和渗透率的求解方法进行组合，得到了平均误差约为7%的表征垂直微柱蒸发器换热性能的最佳组合模型（Darcy_avg（S）+SE）。利用该模型研究了微柱几何结构的影响，发现蒸发器最大换热能力在渗透率与毛细压力间平衡，几何尺寸接近最佳间距比（d/l≈0.35）及高的微柱对应更高的散热能力，具有更小后退接触角的微柱群对应更高的干涸阈值。重力作用下干涸长度的增加导致干涸阈值的显著降低，遗传算法能有效地用于求解不同干涸长度下的最优尺寸。排列方式影响干涸阈值，最佳间距比下叉排布置的微柱阵列较顺排布置换热能力提升近13%。
- 微柱群 /
- 蒸发器 /
- 干涸阈值 /
- 优化 /
- 薄膜蒸发
Abstract:
The existing dryout threshold model was optimized by adding gravity and combining with capillary force and permeability solution methods, so as to obtain the best combined model (Darcy_avg(S)+SE) for characterizing the heat transfer performance of a vertical micropillar evaporator with an average error of about 7%. The effect of micropillar geometry was investigated using this model. Model predictions indicated that the maximum heat transfer capacity of the evaporator was balanced between permeability and capillary pressure; those geometries close to the optimal pitch ratio (d/l≈0.35) and higher micropillars correspond to greater heat dissipation capacity; and that micropillar arrays with smaller receding contact angles correspond to greater dryout thresholds. The increase of the dryout length under gravity led to a significant decrease of the dryout threshold, and the genetic algorithm can be effectively used to solve for the optimal size at different dryout lengths. The arrangement method affected the dryout threshold, the forked-row arrangement of the micropillar arrays increased the heat transfer capacity by nearly 13% compared with the smooth-row arrangement at optimal spacing ratio.
- micropillar arrays /
- evaporator /
- dryout threshold /
- optimization /
- thin-film evaporation

HTML

图 1 蒸汽室结构示意图和圆柱形微柱阵列的蒸发器示意图

Figure 1. Schematic of the vapor chamber and an evaporator with cylindrical micropillars

下载: 全尺寸图片幻灯片

图 2 单元内热量传递及弯月面分区示意图

Figure 2. Schematic of heat transfer and partitioning of the meniscus within the unit cell

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图 3 不同模型组合与实验对照图

Figure 3. Control chart of different model combinations and experiments

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图 4 间距比对干涸阈值影响

Figure 4. Effect of spacing ratio on dryout threshold results

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图 5 不同后退接触角下干涸阈值变化

Figure 5. Variation of dryout threshold values at different receding contact angles

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图 6 不同干涸长度下干涸阈值随几何尺寸变化图

Figure 6. Variation of dryout threshold results with geometry for different dryout lengths

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图 7 干涸阈值随干涸长度变化图

Figure 7. Plot of dryout threshold results with dryout lengths

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图 8 不同干涸长度下的最优尺寸

Figure 8. Optimal dimensions for different dryout lengths

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图 9 微柱群不同排布示意图

Figure 9. Schematics of different rows of micropillar arrays

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图 10 相同几何尺寸下排列方式对干涸阈值影响

Figure 10. Effect of alignment on dryout threshold values for the same geometry

下载: 全尺寸图片幻灯片

表 1 24 ℃水热物理参数表

Table 1. Table of thermophysical parameters of water at 24 ℃

参数	数值
σ/（N/m）	0.071
μ/10⁻³（Pa·s）	0.89
h_fg/（kJ/kg）	2443.6
ρ/（kg/m³）	997

下载: 导出CSV

表 2 不同干涸长度下最优尺寸对应干涸阈值表

Table 2. Table of optimum sizes corresponding to dryout thresholds for different dryout lengths

d/μm	l/μm	h/μm	Q/W（L=2 cm）	Q/W（L=3 cm）	Q/W（L=4 cm）
55	100	100	13.92	8.33	5.53
54	96	100	13.82	8.37	5.65
50	88	100	13.51	8.30	5.69
注：表中加粗数据含义为三组尺寸纵向比较，可看出各组优化尺寸均对应着相应干涸长度下最大的干涸阈值。

下载: 导出CSV

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