Abstract: Flow stability of a falling film in the mass transfer process accompanied by concentration-driven Marangoni effect was modeled and analyzed by utilizing the linear stability theory. The critical conditions, at which the Marangoni convection emerged in the falling film, were obtained on the base of nonlinear concentration profile and fluid flow. An experimental installation was set up to measure the change of mass transfer coefficient, so as to obtain the critical Marangoni number. The agreement between the theoretically predicted and experimentally obtained critical Marangoni numbers was acceptable. Thus, the present theoretical model can be utilized to predict the occurrence of Marangoni convection and intensify the mass transfer process.

Key words:

Marangoni效应, 降膜, 流动稳定性

摘要： 通过建立降膜流动传质模型，并考虑液相流动及非线性浓度分布的影响，利用线性微扰理论得到了降膜流动传质过程Marangoni效应发生的理论临界条件.用所建立的降膜流动传质实验装置得出实测传质系数的变化，由此获得Marangoni效应发生的实测临界条件，实测值与理论值基本符合，从而为工业上常见的降膜流动传质过程中Marangoni现象的预测和利用提供了理论依据.

关键词:

Marangoni效应, 降膜, 流动稳定性