关键词: 流动沸腾, 非共沸, 组分比, 微通道

Abstract: The heat transfer characteristics in microchannel 0.86 mm in diameter for refrigerant mixture R32/R134a with three different mass proportions were studied and the effect of non-azeotropic working media with different mass proportions on heart transfer in the microchannel was investigated. The experiment result showed that when mass proportion was 35%/65%，flow boiling heat transfer was the best at low dryness fraction，while the effect of mass proportion on heat transfer was not obvious at high dryness fraction. Heat transfer resistance effect was not obvious at a high mass flux. Pressure drop was the largest when mass proportion was 15%/85%，and for the other two mass proportions，25%/75% and 35%/65%，pressure drop was relatively smaller.

Key words: flow boiling, non-azeotropic, proportion, microchannel