A brass block was constructed as a test block to study the Marangoni condensation in this paper. The maximal temperature difference of the block surface on which pure steam condensed was 11℃ when the block was cooled by the normal temperature water. Regulations and modes of Marangoni condensation for mixture vapor with different mass fractions were studied when the speed of vapor was 0.3m/s. As both temperature gradients and concentration gradients exist on the condensing surface, the experimental results indicate that the maximal heat transfer coefficient of mixture vapor can be 2.8 times that of pure steam when the Marangoni condensation of mixture vapor appears. The heat transfer coefficient of mixture vapor increases with the decrease of surface subcooling, and it appears a steep increase when the surface subcooling is small enough; the heat transfer flux has a maximum value as the surface subcooling rises; and the different modes of condensation are confirmed when the different ethanol concentration and different surface subcooling exist.

本文首先构造了一个在常温水冷却时，纯水蒸汽凝结时表面温度差可以达到11。c的黄铜试件。利用该试件在蒸汽流速为0.3m/s时，进行了不同浓度水一酒精混合蒸汽以及纯水蒸汽的凝结换热特性和凝结状态的实验研究。实验结果表明：由于凝结表面存在温度差，水一酒精混合蒸汽出现珠状凝结，凝结换热系数最大可以达到纯水蒸汽凝结的2.8倍；混合蒸汽凝结换热系数随表面过冷度减小而增加，并在较小过冷度时出现陡增；凝结换热量随表面过冷度增加存在最大值；观察得出了不同表面过冷度下不同酒精浓度时的凝结状态。