Experimental study on the frosting and heat transfer characteristics of cooling surfaces in confined parallel and counter flow channels

被引：1

作者：

Dong, Xiaojun ^{[1
]}

Liu, Xue ^{[1
]}

Ma, Bin ^{[2
]}

Ding, Pei ^{[1
]}

Yan, Shaohang ^{[1
]}

Wang, Yanwu ^{[1
]}

Hou, Yu ^{[1
]}

Lai, Tianwei ^{[1
]}

机构：

[1] Xi An Jiao Tong Univ, State Key Lab Multiphase Flow Power Engn, Xian 710049, Peoples R China

[2] China Aerodynam Res & Dev Ctr, Facil Design & Instrumentat Inst, Mianyang 621000, Sichuan, Peoples R China

来源：

HEAT AND MASS TRANSFER | 2023年 / 59卷 / 03期

基金：

中国国家自然科学基金;

关键词：

DIMENSIONLESS CORRELATIONS; GROWTH; DENSIFICATION; EXCHANGERS; WATER;

D O I：

10.1007/s00231-022-03266-3

中图分类号：

O414.1 [热力学];

学科分类号：

摘要：

Frosting usually occurs in narrow confined heat exchanger flow channels, which deteriorates the heat transfer capacity of heat exchanger. In order to analyze the frosting characteristics and heat transfer in the confined flow channel, a test rig for frosting visualization is designed. The variations of both humid air parameters and cooling surface temperature along the flow channel are taken into account in the frosting. In this kind of frosting process, the dominating factors shift between cooling surface temperature and humidity ratio in different frosting stages. The frost growth rate gradually decreases in the overall trend. It increases slightly in the middle of frosting stage due to the rising humidity ratio in the confined flow channel. Lower cooling surface temperature and higher humidity ratio are conducive to greater and earlier frost growth rate in the confined flow channel. The proportion of latent heat transfer rate along the flow gradually lessens for the parallel flow case, while it rises in the counter flow case. The average frost thickness in the counter flow case is 28.99% larger than that in the parallel flow case. The frost accumulation and heat transfer rate in counter flow case are greater than those in parallel flow case with different humid air parameters at the inlet.

引用

页码：535 / 549

页数：15

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