Subcooled flow boiling of water in a large aspect ratio microchannel

被引：37

作者：

Yin, Liaofei ^{[1
,2
]}

Xu, Ruina ^{[1
]}

Jiang, Peixue ^{[1
]}

Cai, Haofei ^{[1
]}

Jia, Li ^{[2
]}

机构：

[1] Tsinghua Univ, Dept Thermal Engn, Minist Educ, Key Lab Thermal Sci & Power Engn, Beijing 100084, Peoples R China

[2] Beijing Jiaotong Univ, Sch Mech Elect & Control Engn, Inst Thermal Engn, Beijing 100044, Peoples R China

来源：

INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER | 2017年 / 112卷

基金：

中国博士后科学基金;

关键词：

Flow boiling; Large aspect ratio; Microchannel; Flow patterns; Heat transfer; HEAT-TRANSFER;

D O I：

10.1016/j.ijheatmasstransfer.2017.05.028

中图分类号：

O414.1 [热力学];

学科分类号：

摘要：

Water flow boiling in large aspect ratio microchannels was experimentally investigated in a rectangular microchannel 300 mu m deep and 6 mm wide; hence, the hydraulic diameter was 571 mu m and the aspect ratio was 20. The tests used mass fluxes of G = 261-961 kg/(m(2) s) and heat fluxes of q '' = 631-987 kW/m(2) with the combined effects on the flow boiling phenomena characterized by the Boiling number at an inlet temperature of 65 degrees C. The results show the flow patterns and the heat transfer and pressure drop characteristics during flow boiling in the large aspect ratio microchannel. Sweeping flow with relatively high heat transfer rates was observed while the strengthening effect of the bubble confinement on the heat transfer did not occur during the subcooled flow boiling in the large aspect ratio microchannel. Nucleate boiling dominated the heat transfer with the regular pressure drop fluctuations detected during the sweeping flow and the churn flow. (C) 2017 Elsevier Ltd. All rights reserved.

引用

页码：1081 / 1089

页数：9

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