关键词: 气液两相流, 蒸发, 传热, 水膜, 喷淋密度

Abstract: In order to improve heat transfer performance of the evaporative condenser plate and enhance the gas-liquid two-phase flow,four heat-exchange plates of internal fin-plate evaporative condenser were developed. The water film flowing form with different spray densities and the influence of spray density on heat transfer of heat-exchange plate were investigated. The results showed that the thickness of water film thinned with the decrease of the spray density. Affected by the plate type and gas fluid shear stress,water film flowing gathered toward the center area,and the splash of water film appeared in local area with larger spray density. With the decrease of spray density,the splash of water film disappear gradually. However,in the low spray density,the “dry sports”phenomenon had produced on the some internal fin-plate. When the spray density were 0.524kg/(m·s),0.738kg/(m·s),0.905kg/(m·s),the performance of heat transfer of semicircle corrugated plate was superior to the other plates. Also,heat-exchange area of plate and stable time of water film were the main factors that affected heat transfer performance under these spay densities. The experimental results provide the theoretical reference of engineering application and design of internal fin-plate evaporative condenser.

Key words: gas-liquid two-phase flow, evaporation, heat transfer, water film, spray density