Experimental investigation of convective condensation heat transfer on tube bundles with different surface wettability at large amount of noncondensable gas

被引：27

作者：

Hu, H. W. ^{[1
]}

Tang, G. H. ^{[1
]}

Niu, D. ^{[1
]}

机构：

[1] Xi An Jiao Tong Univ, Sch Energy & Power Engn, MOE Key Lab Thermofluid Sci & Engn, Xian 710049, Peoples R China

来源：

APPLIED THERMAL ENGINEERING | 2016年 / 100卷

基金：

中国国家自然科学基金;

关键词：

Convective condensation heat transfer; Noncondensable gas; Superhydrophobic; Tube bundle effect; DROPWISE CONDENSATION; FILM CONDENSATION; HORIZONTAL TUBE; COALESCENCE; INUNDATION; COATINGS; MIXTURES; STEAM; AIR;

D O I：

10.1016/j.applthermaleng.2016.02.086

中图分类号：

O414.1 [热力学];

学科分类号：

摘要：

Surface modification technology provides the potential to further enhance condensation heat and mass transfer. The water vapor convective condensation heat transfer of condensing heat exchanger assembled by plain, 2D-finned and 3D-finned tubes with different surface wettability was investigated experimentally, when the volume fraction of noncondensable gas was more than 75%. The condensation behaviors and flow patterns of the condensate among bundles were also recorded visually. It was found that the discrete droplet flow of condensate formed among tube bundles in the presence of large amount of noncondensable gas. Typical factors including the cooling water flow rate, air-vapor mixture flow rate, and the volume fraction of water vapor on convective condensation heat transfer coefficient were discussed in detail. The experimental results showed that the average condensation heat transfer coefficient of superhydrophobic plain tubes with 9 rows was 1.53 times of one single row for the water vapor volume fraction of 11% while it reduced to 1.34 times of one single row when the vapor volume fraction reached 23%. (C) 2016 Elsevier Ltd. All rights reserved.

引用

页码：699 / 707

页数：9

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