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.
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 reduction activity of nitrate and the formation of ammonium are mainly controlled by the diffusion limitation and the mass transfer of the reactants.
同时，催化剂的活性和选择性受到扩散限制和质量传输的影响。
However, to date porous MOFs are still largely restricted to the microporous regime despite negative impact of their small pore size on diffusion and mass transfer for their practical applications.
然而，到目前为止多孔金属-有机骨架一直限制在微孔范围，其较小的孔道不利于物质扩散和传输，从而限制其实际应用。
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