水平表面混合蒸气Marangoni凝结瞬态过程特性的实验研究  

Experimental Study on Time-Series Characteristics of Marangoni Condensation of Vapor Mixtures on a Horizontal Plate

作　　者：李勇[1] 夏凯[1] 陈娜娜[1] 王进仕[1] 严俊杰[1] 

机构地区：[1]西安交通大学动力工程多相流国家重点实验室,西安710049

出　　处：《工程热物理学报》2018年第2期335-340,共6页Journal of Engineering Thermophysics

基　　金：国家重点基础研究发展计划(No.2015CB251504);国家自然科学基金(No.51436006;No.51206133)

摘　　要：本文设计、搭建了水平表面上凝结换热实验系统,对水-酒精混合蒸气Marangoni凝结的瞬态过程进行了实验研究。研究发现:随着冷却水温度、酒精蒸气浓度的升高,在凝结瞬态过程中,表面过冷度先出现周期性变化,进而周期性减弱直至出现不规律变化。蒸气流速的升高总会促进表面过冷度出现周期性变化。结合实验过程中凝结形态变化规律,总结得到了凝结瞬态过程中的三种典型类型:成膜类型、液珠周期性运动类型与液珠不规律运动类型。In this paper, an experimental system for condensation on a horizontal surface was designed and built to study the Marangoni condensation of ethanol-water mixtures during the time-series process. The results indicated that： as the impinging cooling water temperature and ethanol vapor concentration increased, in the time-series process, the periodical variation in the vapor-to-surface temperature difference appeared first and then weakened until was replaced by the irregular one. The increase in the vapor velocity always promoted the periodic variation in the vapor-to-surface temperature difference. Based on the observed condensation modes during the experiments, three typical condensation styles during the time-series process were concluded： filming style, periodic-dropwise style and irregular-dropwise style.

关 键 词：水平表面 混合蒸气 瞬态过程 周期性 

分 类 号：TK121[动力工程及工程热物理—工程热物理]