关键词: 乙醇, 混合工质, 振荡热管, 传热, 相平衡, 汽液平衡

Abstract: The thermal resistance characteristics of ethanol-based binary mixture pulsating heat pipe was studied experimentally. The working fluids were ethanol mixed with water, acetone and methanol separately. Mixed ratio of volume was 2:1 and 4:1, heat power was from 10 W to 100 W, and filling ratio was 45%, 55%, 62%, 70% and 90%. Compared with the pure ethanol pulsating heat pipe at 45% filling ratio, mixed water with ethanol could delay the dry-out, and the thermal resistance of ethanol-water pulsating heat pipe was lower than that of pure water and ethanol. At 55% filling ratio, the thermal resistance of ethanol-acetone pulsating heat pipe is also lower, while at filling ratios of 62%, 70% and 90%, the thermal resistance of the binary mixture pulsating heat pipes was slightly higher than that of pure working fluids. The effect of the mixture on pulsating heat pipes is mainly related with the mixture properties, forces and momentum interchange among molecules, vapor-liquid phase equilibrium and phase change characteristics, and mass transfer resistance.

Key words: ethanol, mixture working fluid, pulsating heat pipe, heat transfer, phase equilibrium, vapor liquid equilibrium