将传质方程引入到垂直管降膜蒸发传热模型中，求解时考虑了径向速度、质量扩散系数和膜厚变化对传热的影响。
The mass transfer equation was introduced into heat transfer model of falling film evaporation. The radial velocity, mass diffusion coefficient and variation of film thickness were taken into account.
同一传质体系，在相同流动条件下孔隙率大的膜的传质系数大于孔隙率小的膜的传质系数。
The mass transfer coefficient was higher for the big porosity membrane than for the small porosity one at same experiment condition.
通过考察体积传质系数，确定了纤维液膜萃取分离器的最佳填充密度和最佳流量比。
By analyzing the volume mass-transfer coefficient, the optimal operating flow-ratio and packed density were obtained.
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