定壁面浓度瞬态对流传质的理论分析

Transient Convective Mass Transfer at Constant Boundary Density

基于对流传质动态微分方程组,按对流传质浓度边界层有关假设,建立了动态的边界层积分方程,并且对其进行求解,给出了瞬态浓度边界层厚度和对流传质系数随时间和空间变化关系式。结果表明动态过程的任一时刻壁面上稳定和非稳定阶段是并存的,且它们各自有自己的规律;但各处从非稳定向稳定过度过程中对流传质系数变化非常剧烈。

Based on the dynamic differential equations and the rational hypothesis for the density boundary layer,the dynamic integral equation is drawn.The thickness and the coefficient for the convective mass transfer depending on the time and space are given.The results show that stable and unstable stage coexist during the developing mass boundary layer,which are developing in own laws.In the development of unstable stage,the covective mass transfer varies greatly.