化工学报 ›› 2024, Vol. 75 ›› Issue (8): 2840-2851.DOI: 10.11949/0438-1157.20240234

• 流体力学与传递现象 • 上一篇    下一篇

硅基微柱簇阵列微通道流动沸腾实验研究

曲玖哲1(), 杨鹏2, 杨绪飞3, 张伟3(), 宇波3, 孙东亮3, 王晓东1   

  1. 1.华北电力大学新能源电力系统全国重点实验室,北京 102206
    2.北京计算机技术及应用研究所,北京 100854
    3.北京石油化工学院机械工程学院,北京 102617
  • 收稿日期:2024-03-01 修回日期:2024-04-26 出版日期:2024-08-25 发布日期:2024-08-21
  • 通讯作者: 张伟
  • 作者简介:曲玖哲(1995—),男,博士研究生,qujiuzhe@163.com
  • 基金资助:
    国家自然科学基金项目(52076015);北京市教委科研计划项目(KZ202110017026)

Experimental study on flow boiling in silicon-based microchannels with micropillar cluster arrays

Jiuzhe QU1(), Peng YANG2, Xufei YANG3, Wei ZHANG3(), Bo YU3, Dongliang SUN3, Xiaodong WANG1   

  1. 1.State Key Laboratory of Alternate Electrical Power System with Renewable Energy Sources, North China Electric Power University, Beijing 102206, China
    2.Beijing Institute of Computer Technology and Application, Beijing 100854, China
    3.School of Mechanical Engineering, Beijing Institute of Petrochemical Technology, Beijing 102617, China
  • Received:2024-03-01 Revised:2024-04-26 Online:2024-08-25 Published:2024-08-21
  • Contact: Wei ZHANG

摘要:

为实现硅基微通道流动沸腾换热强化,分别设计并加工了具有并联微通道、稀疏微柱簇和致密微柱簇结构的微通道换热器,以丙酮为工质开展热通量200~650 kW·m-2的流动沸腾实验。结果表明,相较于并联微通道,稀疏微柱簇和致密微柱簇微通道具有更强的两相换热性能;在质量流速43 kg·m-2·s-1的条件下,稀疏微柱簇微通道与致密微柱簇微通道的平均传热系数分别可达到18.6和17.8 kW·m-2·K-1,稀疏微柱簇微通道PEC最大可达到1.49。微柱簇阵列随热通量的增加呈现出三种不同流型,可视化研究表明,稀疏微柱簇内产生的汽相更倾向发生微柱簇绕流,而致密微柱簇内产生的汽相更倾向包裹住微柱簇,这使得前者表现出更强的两相换热性能。

关键词: 微通道, 微柱簇阵列, 相变, 气液两相流, 强化换热, 气泡行为

Abstract:

Heat exchangers with parallel microchannels, sparse micropillar arrays, and dense micropillar cluster arrays were designed and manufactured to enhance flow boiling heat transfer capabilities in silicon-based microchannels. Flow boiling experiments were conducted with acetone as the working fluid at heat fluxes from 200 to 650 kW·m-2. The results indicated that both sparse and dense micropillar cluster microchannels had superior heat transfer performance compared to parallel microchannels; at a mass flux of 43 kg·m-2·s-1, the average heat transfer coefficients for sparse and dense micropillar cluster microchannels reached 18.6 and 17.8 kW·m-2·K-1, respectively. The sparse micropillar cluster microchannel's performance evaluation criteria (PEC) reached 1.49. The micropillar cluster arrays exhibited three distinct flow patterns as heat flux increased. Visualization investigation showed that the vapor phase in sparse micropillar clusters arrays was prone to flow around the micropillars. It is more inclined to wrap the micro-pillar clusters, which makes the former show stronger two-phase heat transfer performance.

Key words: microchannels, micropillar cluster arrays, phase change, gas-liquid flow, heat transfer enhancement, bubble behavior

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