垂直微柱蒸发器干涸阈值模型求解及尺寸优化
Model solving and size optimization of dryout threshold for vertical micropillar evaporators
高申宝 1焦凤 1何永清2
作者信息
- 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
- 折叠
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％.
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.
关键词
微柱群/蒸发器/干涸阈值/优化/薄膜蒸发Key words
micropillar arrays/evaporator/dryout threshold/optimization/thin-film evaporation引用本文复制引用
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)
出版年
2024
NETL
NSTL
万方数据