Determination of annular condensation heat transfer coefficient of steam in microchannels with trapezoidal cross sections

被引：18

作者：

Quan, Xiaojun ^{[1
]}

Dong, Lining ^{[1
]}

Cheng, Ping ^{[1
]}

机构：

[1] Shanghai Jiao Tong Univ, Sch Mech & Power Engn, Shanghai 200240, Peoples R China

来源：

INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER | 2010年 / 53卷 / 19-20期

基金：

中国国家自然科学基金;

关键词：

Trapezoidal microchannel; Steam condensation; Pt thermoresistor; Heat transfer coefficient; FILM CONDENSATION; PRESSURE-DROP; FLOW;

D O I：

10.1016/j.ijheatmasstransfer.2010.03.043

中图分类号：

O414.1 [热力学];

学科分类号：

摘要：

Experiments have been carried out to determine annular condensation heat transfer coefficient of steam in two silicon microchannels having trapezoidal cross sections with the same aspect ratio of 3.15 at 54 < G < 559 kg/m(2) s under 3-side cooling conditions. A semi-analytical method, based on turbulent flow boundary layer theory of liquid film with correlations of pressure drop and void fraction valid for microchannels, is used to derive the annular local condensation heat transfer coefficients. The predicted values based on the semi-analytical model are found within +/- 20% of 423 data points. It is shown that the annular condensation heat transfer coefficient in a microchannel increases with mass flux and quality and decreases with the hydraulic diameter. (C) 2010 Elsevier Ltd. All rights reserved.

引用

页码：3670 / 3676

页数：7

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