自然对流下含纳米SiO_2涂层表面抑霜研究  

EXPERIMENTAL STUDY OF RESTRAINING FROST FORMATION ON NANO-SIO_2 COATING SURFACE UNDER NATURAL CONVECTION CONDITIONS

作　　者：张新华[1] 刘中良[1] 王皆腾[1] 勾昱君[1] 孟声[1] 马重芳[1] 

机构地区：[1]北京工业大学传热强化与过程节能教育部重点实验室及传热与能源利用北京市重点实验室,北京100022

出　　处：《工程热物理学报》2006年第2期277-279,共3页Journal of Engineering Thermophysics

基　　金：国家自然科学基金资助项目(No.50376001)国家973项目资助(No.G2000026304)

摘　　要：本文用含有纳米SiO2的涂层作为亲水表面,并在其上进行结霜实验研究。用接触角测量仪测出涂层表面和紫铜板表面的接触角,在不同实验条件下测量了涂层表面霜层的厚度,并与紫铜表面的霜厚进行了对比。结果表明在环境相对湿度较小、冷壁温度不太低的条件下,这种涂层能够较好地抑制霜层的生长。通过使用红外成像仪对不同时刻霜层表面温度测量,结果表明,这种亲水涂层具有较小的传热热阻,与具有较大传热热阻的霜层相比几乎可以忽略。A hydrophilic surface, which contains nano-SiO2, was developed for restraining frost formation. The angles of the contact of coating surface and copper plate were measured, and the frost layer thickness on coating surface was measured and compared with that on copper plate surface in different experimental conditions. The experimental results demonstrate that this coating could restrain the frost growth in the condition of lower relative humidity and higher cold plate temperature. By measuring frost layer surface temperature in different times with an infrared imaging apparatus, the results show that this hydrophilic coating has small heat resistance, and the heat resistance may be ignored compared with that of frost layer.

关 键 词：热工学 纳米SiO2涂层 实验研究 抑霜 

分 类 号：TK124[动力工程及工程热物理—工程热物理]