高聚合物膜蒸发器冷凝表面液滴润湿状态研究  

Research on Droplet Wetting State of Polymer Film Evaporator Condensation Surfaces

作　　者：朱毅[1] 吴晓敏[1] 褚福强[1] 

机构地区：[1]清华大学热能工程系热科学与动力工程教育部重点实验室,北京市CO2资源利用与减排技术重点实验室,北京100084

出　　处：《工程热物理学报》2016年第11期2447-2451,共5页Journal of Engineering Thermophysics

基　　金：国家自然科学基金(No.51476084);清华大学自主科研计划(No.20131089319)

摘　　要：为了增强高聚合物膜蒸发器中换热面的导热性能,通常的做法是减小膜的厚度,而低膜厚条件下换热面上冷凝液滴的润湿状态通常只由表面一级结构(槽状)决定。本文在研究已有润湿状态区间的前提下,通过分析Cassie-Baxter方程和Wenzel方程在描述槽状聚合物表面液滴润湿状态时存在的问题,进一步细分了表面润湿状态区间,并分区间提出了相应的状态描述方程,为研究蒸发器换热面上液滴的冷凝形态及进行换热面设计提供了依据。Reduce the thickness of membrane is a popular method to enhance the thermal perfor- mance of the polymer films which will be used in heat transfer area. But reducing the thickness of membrane will eliminate the micro-nano structure of the polymer films and the droplet wetting state will be determined by the surface primary structures （grooves）. By analyzing the Cassie-Baxter equation and the Wenzel equation, we found that the equtions could not describing grooved polymer films wetting state exactly. After researching the exist standards and results of division, this article further subdivided the wetting state scope and put forward more exact equtions representing grooved polymer films wetting state. All the results can be used in the condensed form research of the droplet and the heat transfer surface design.

关 键 词：高聚合物膜蒸发器 冷凝表面 润湿状态 槽状表面 

分 类 号：TK17[动力工程及工程热物理—热能工程]