热点情形下水平微柱蒸发器干涸热通量计算

李勇新; 何永清; 戴锋; 焦凤

doi:10.13224/j.cnki.jasp.20230530

热点情形下水平微柱蒸发器干涸热通量计算

doi: 10.13224/j.cnki.jasp.20230530

李勇新^1,,
何永清²,
戴锋³,
焦凤^1,*, ,

1.
昆明理工大学化学工程学院，昆明 650500
2.
重庆工商大学微纳系统技术及智能传感重庆市重点实验室，重庆 400067
3.
四川新能源汽车创新中心，四川宜宾 644000

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:
李勇新（1999-），男，硕士生，研究方向为微通道流动与传热。E-mail：3266005184@qq.com

通讯作者:
焦凤（1986-），女，副教授、硕士生导师，博士，研究方向为微通道流动与传热。E-mail：microfluid@kust.edu.cn

中图分类号: V231.1；TK124
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出版历程
- 收稿日期: 2023-08-18
- 网络出版日期: 2025-07-13

Calculation of the dry-out heat flux of a horizontal microcolumn evaporator under hot spot conditions

LI Yongxin^1
,,
HE Yongqing²,
DAI Feng³,
JIAO Feng^{1,*
, ,}

1.
Faculty of Chemical Engineering，Kunming University of Science and Technology，Kunming 650500，China
2.
Chongqing Key Laboratory of Micro-Nano System and Intelligent Sensing，Chongqing Technology and Business University，Chongqing 400067，China
3.
Sichuan New Energy Vehicle Innovation Centre，Yibin Sichuan 644000，China

摘要

摘要:
基于现有干涸热通量模型，将热点效应下的毛细压力和渗透率计算方法组合，得到了相对误差约为7.6%的水平微柱蒸发器干涸热通量的研究模型。将蒸发器表面分为蒸发区、非蒸发区和热点区，研究了蒸发器的几何尺寸，热点面积和过热度对干涸热通量的影响。计算结果表明：最大传热能力取决于毛细压力与渗透率之间的平衡关系，几何尺寸接近最佳间距比（～0.25）及较高的微柱对应有更好的散热能力，拥有最小后退接触角的微柱对应干涸热通量提升了约2倍。模型的过热度与热点面积呈负相关，较大的热点面积对应有较小的过热度，且较大的局部压力对应有较大的Nu和较小的过热度。
- 微柱群 /
- 蒸发器 /
- 热点 /
- 干涸热通量 /
- 薄膜蒸发
Abstract:
Based on existing dry-out heat flux model, the research model of dry-out heat flux of horizontal microcolumn evaporator with a relative error of about 7.6% was obtained by combining the capillary pressure and permeability calculation methods under the hot spot effects. The evaporator surface was divided into evaporative, non-evaporative and hot spot areas, and the effects of evaporator geometry, hot spot area and superheat on the heat flux to dryness were investigated. Calculated results showed that the maximum heat transfer capacity depended on the equilibrium relationship between capillary pressure and permeability; microcolumns with geometries close to the optimal pitch ratio (～0.25) and higher corresponded to better heat dissipation, and microcolumns with the smallest receding contact angle corresponded to an enhancement of the heat flux of desiccation by a factor of about two. The modelled superheat was negatively correlated with the hotspot area, with larger hotspot areas corresponding to smaller superheat, and larger local pressures corresponding to larger Nu and smaller superheat.
- micropillar arrays /
- evaporator /
- hot spot /
- dry-out heat flux /
- thin-film evaporation

HTML

图 1 蒸发器结构及散热机理

Figure 1. Vaporator structure and heat dissipation mechanism

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图 2 蒸发器分区示意图

Figure 2. Schematic diagram of evaporator zoning

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图 3 蒸发器平面蒸发热通量分布图

Figure 3. Distribution of evaporation heat flux in the plane of the evaporator

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图 4 整体计算流程图

Figure 4. Overall calculation flowchart

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图 5 不同工况本文模型计算结果与实验结果对比

Figure 5. Comparison of model calculation results and experimental results for different working conditions in this paper

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图 6 水平热点情形下柱高、间距对干涸热通量的影响

Figure 6. Effects of column height and spacing on dry-out heat flux under horizontal hot spots

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图 7 水平热点情形下直径、间距比对干涸热通量的影响

Figure 7. Effects of diameter and spacing ratio on dry-out heat flux under horizontal hot spots

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图 8 干涸热通量随特征长度变化（h=100 μm）

Figure 8. Dry-out heat flux varies with feature length （h=100 μm）

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图 9 过热度随热通量及局部压力的变化

Figure 9. Variation of superheat with heat flux and local pressure

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图 10 微柱热性能的变化关系

Figure 10. Variation relationship of the thermal performance of microcolumns

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