垂直管内降膜载气蒸发的研究

在蒸发的降液膜表面引入惰性载气,可以有效地强化降膜蒸发传热。研究了液体流量、载气流量、壁面热负荷及料液物性等对降膜载气蒸发传热的影响。建立了数学模型,并进行了数值求解。实验结果表明,采用降膜载气蒸发,可提高传热膜系数,降低壁面过热度。还将模型计算结果与实验结果进行了比较。

An Experimental Investigation on Falling Film Gas Carrying Evaporation in Vertical Tube

Falling Film Gas Carrying Evaporation (F F G C E) in a vertical tube was investigated experimentally and theoretically. The effects of liquid flow rate, carrying gas flow rate, heat flux and liquid properties on heat transfer coefficient were measured. The experimental results showed that the heat transfer coefficient of falling film evaporation in a vertical tube with carrying gas introduced was greatly increased, and the degree of superheat of wall was reduced. The mathematical models for F F G C E were established and solved by numerical method on computer. The results were found in good agreement with the experimental data.