中文摘要：

本文研究了蒸汽压力对水-酒精混合蒸汽竖直平板表面凝结换热特性的影响。搭建了具有高气密性的Marangoni凝结换热实验台，分别针对不同压力（31．16kPa，47．36kPa，84．53kPa）、不同表面过冷度（表面过冷度范围2～32℃）的纯水、水-酒精混合液（气相酒精质量百分比浓度为2．28％，5．1％，51％）和酒精进行了换热特性的实验研究，实验结果表明混合蒸汽在相同流速和浓度下凝结表面传热系数随压力的升高而升高，分析认为这是因为相平衡压力的提高会导致凝结液量增加和凝结液平均温度提高，而使凝结汽液界面的表面张力提高，进一步增强了Marangoni效应的影响，从而使凝结表面传热得到加强。

英文摘要：

In order to study the effect of vapor pressure on Marangoni condensation process of waterethanol mixture vapor on a vertical plate, a Marangoni condensation experimental system was founded. The condensation characteristics of pure water, water-ethanol mixture （ethanol vapor mass fraction was 2.28%, 5.1% and 51%） and pure ethanol under three pressures （31.16 kPa, 47.36 kPa, 84.53 kPa） and different surface subcooling（2～32℃） were experimentally studied, the experimental results showed that, heat transfer coefficients of Marangoni condensation increased with vapor pressures under the same vapor velocity and vapor concentration, the reason was that, the increase of vapor pressure can induce the enhancement of the mass, the surface tension, the average temperature and the disturbance of condensate film, and hence the heat and mass transfer ratio at the condensate-vapor interface improved.