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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

高申宝, 焦凤, 何永清. 垂直微柱蒸发器干涸阈值模型求解及尺寸优化[J]. 航空动力学报, 2024, 39(X):20220723 doi: 10.13224/j.cnki.jasp.20220723
引用本文: 高申宝, 焦凤, 何永清. 垂直微柱蒸发器干涸阈值模型求解及尺寸优化[J]. 航空动力学报, 2024, 39(X):20220723 doi: 10.13224/j.cnki.jasp.20220723
GAO Shenbao, JIAO Feng, HE Yongqing. Model solving and size optimization of dryout threshold for vertical micropillar evaporators[J]. Journal of Aerospace Power, 2024, 39(X):20220723 doi: 10.13224/j.cnki.jasp.20220723
Citation: GAO Shenbao, JIAO Feng, HE Yongqing. Model solving and size optimization of dryout threshold for vertical micropillar evaporators[J]. Journal of Aerospace Power, 2024, 39(X):20220723 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
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

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

  • 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%。

     

  • 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

    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

    图 3  不同模型组合与实验对照图

    Figure 3.  Control chart of different model combinations and experiments

    图 4  间距比对干涸阈值影响

    Figure 4.  Effect of spacing ratio on dryout threshold results

    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

    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

    图 7  干涸阈值随干涸长度变化图

    Figure 7.  Plot of dryout threshold results with dryout lengths

    图 8  不同干涸长度下的最优尺寸

    Figure 8.  Optimal dimensions for different dryout lengths

    图 9  微柱群不同排布示意图

    Figure 9.  Schematics of different rows of micropillar arrays

    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

    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
    hfg (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:表格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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  • 收稿日期:  2022-09-25
  • 网络出版日期:  2024-02-29

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