The Stability of Evaporating Thin Liquid Film Containing Insoluble Surfactant on Heated Substrate

Chun Xi Li; Bing Lu; Xue Min Ye

doi:10.4028/www.scientific.net/AMR.614-615.191

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The Stability of Evaporating Thin Liquid Film Containing Insoluble Surfactant on Heated Substrate

Abstract:

Flow of evaporating thin liquid film containing insoluble surfactant on a uniformally heated substrate is considered in this paper. Coupled nonlinear evolution equations for the film thickness and surfactant concentration are derived on the base of lubrication theory and reasonable boundary conditions. The flow stability of the thin liquid film has been studied using normal mode method according to the linear stability theory. The results show that the film stability is promoted by increasing the Capillary number and the surfactant Peclet number, while increasing the Marangoni number, the interface resistance number, the vapor recoil number and the evaporation number can reduce the stability of the system.