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.
对汽油蒸气的一些关键物性参数，如油气摩尔质量、压缩因子、蒸气压及油气——空气扩散系数等给出了推荐值或计算式。
Some key parameters such as gasoline vapor mole quality and compression factor, vapor pressure, and vapor-air diffusion coefficient were decided and recommended.
发现污染物在土壤中的质量浓度分布与渗流速度、作用时间、扩散系数等有关。
The results showed that the intensity distribution had relation with the velocity of percolation, time, coefficient of convection and diffusion.
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