实验研究了添加乙醇对含大量不凝气体回路热虹吸管凝结换热的影响. 结果表明，重力回路热虹吸管内添加0.5%?1%(?)乙醇，会在凝结液膜表面形成Marangoni效应，促进局部凝结换热，冷凝管前段的局部换热量提高约9%；乙醇添加量大于1.5%时，乙醇无法完全凝结从而形成新的不凝气体，引起系统工作压力升高，蒸发器蒸汽温度升高，且乙醇含量越大，工作压力越高；乙醇含量为5%时，系统工作压力比纯水时提高64%.

Herein we experimentally investigated the influence of ethanol on condensation heat transfer of gravity loop thermosyphon in presence of massive non-condensable gas. Investigated results revealed that addition of 0.5%?1% mass fraction of ethanol formed Marangoni effect on the surface of condensate film, promoted local condensation heat transfer, and increased 9% local heat flux of the inlet section of the condenser. When the ethanol content was greater than or equal to 1.5%, ethanol cannot fully condense to form the new non-condensable gas, the pressure of the system and temperature of evaporator could be increased, and the higher ethanol content, the higher system pressure, the system pressure of 5% condition was 64% more than pure vapor condition.