溶质在相内的传质形式 – 分子扩散(molecular diffusion)：依靠浓度差为推动力； – 对流传质(mass transfer by convection)：流体流动或搅拌。 分子扩散两种基本形式：等摩尔反向扩散；单向扩散 6.
双语例句
1
If there is a bulk mixing of the layers of gas in the tube by mechanical stirring or because of a density gradient, masstransfer occurs primarily by the mechanism of forced or natural convection.