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.