翅片表面融霜水滞留机理及其影响因素

doi:10.3969/j.issn.0438-1157.2014.z2.016

化工学报 ›› 2014, Vol. 65 ›› Issue (z2): 101-106.DOI: 10.3969/j.issn.0438-1157.2014.z2.016

翅片表面融霜水滞留机理及其影响因素

汪峰, 梁彩华, 杨明涛, 范晨, 张小松

东南大学能源与环境学院, 江苏南京 210096

收稿日期:2014-08-20 修回日期:2014-08-30 出版日期:2014-12-30 发布日期:2014-12-30
通讯作者: 梁彩华
基金资助:
国家自然科学基金项目(51106023);"十二五"国家科技支撑计划项目(2011BAJ03B14)。

Mechanism and influence factors of frost melt water retention on fins

WANG Feng, LIANG Caihua, YANG Mingtao, FAN Chen, ZHANG Xiaosong

School of Energy and Environment, Southeast University, Nanjing 210096, Jiangsu, China

Received:2014-08-20 Revised:2014-08-30 Online:2014-12-30 Published:2014-12-30
Supported by:
supported by the National Natural Science Foundation of China (51106023).

摘要/Abstract

摘要：

为研究空气源热泵除霜过程中翅片表面融霜水的滞留现象,理论分析了滞留融霜水形成的原因,构建了结霜-融霜实验平台,对具有不同表面特性的4种翅片试样进行了结霜-融霜实验,分析了翅片表面特性、结霜程度和融霜温度对融霜水滞留的影响。结果表明,各表面的滞留融霜水分布特性有显著区别:融霜水在亲水表面铺展形成薄薄的水膜,而在超疏水表面凝聚成较小的球形水珠,且分布稀疏。滞留水量随着接触角滞后的减小和接触角的增大而减小,超疏水表面的滞留水量比亲水表面减少了79.82%。普通铝表面的滞留水量及其分布受结霜程度影响,而超疏水表面则不受其影响。改变融霜温度对翅片表面的融霜水滞留几乎没有影响。

关键词: 翅片, 表面特性, 融霜水滞留, 接触角, 接触角滞后

Abstract:

In order to study the phenomenon of the frost melt water retention on fin surfaces of the air source heat pump during the defrosting process, the mechanism of the frost melt water retention was researched by theoretical analysis, and a frosting-defrosting experimental system was developed to study the frost melt water retention on four fin samples with different surface characteristics. Experimental results showed that there was obvious difference on retained water distribution between different fin surfaces: retained water formed a thin water film on the hydrophilic surface while only a few spherical droplets with small sizes stayed on the super hydrophobic surface. The retained water mass decreased with the increase of contact angle hysteresis, which on the super hydrophobic surface decreased by 79.82% compared with that on the hydrophilic surface. The frosting degree had a significant effect on the frost melt water retention of the bare surface while had no effect on that of the super hydrophobic surface. However, changing the defrosting temperature almost had no effect on the frost melt water retention of fin surfaces.

Key words: fin, surface characteristics, frost melt water retention, contact angle, contact angle hysteresis

中图分类号:

TK124

汪峰, 梁彩华, 杨明涛, 范晨, 张小松. 翅片表面融霜水滞留机理及其影响因素[J]. 化工学报, 2014, 65(z2): 101-106.

WANG Feng, LIANG Caihua, YANG Mingtao, FAN Chen, ZHANG Xiaosong. Mechanism and influence factors of frost melt water retention on fins[J]. CIESC Journal, 2014, 65(z2): 101-106.

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翅片表面融霜水滞留机理及其影响因素

Mechanism and influence factors of frost melt water retention on fins

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