关键词:

降膜蒸发, 气提效应, 水力特性, 传热传质性能

Abstract:

This paper is concerned with the theoretical analysis to obtain the effect of water inlet temperature on the performance of the proposed falling film evaporator combined with vapor-lift effect.Results indicate that the transported liquid flow rate and transportation height ratio (ratio of the pumping height to the driving suction depth) increase with higher water inlet temperature.However, higher water inlet temperature results in the decreasing of falling film thickness which leads to higher heat transfer coefficient.Moreover, the enhancement on the heat transfer performance decreases with increasing water inlet temperature.Theoretical analysis shows when transporting the same water flow rate, the water inlet temperature increases from 30℃ to 90℃, and the heat transfer coefficient increases by 66.8% to 69.3%.

Key words:

降膜蒸发, 气提效应, 水力特性, 传热传质性能