关键词: 表面活性剂, 薄液膜, 去湿现象, 分离压, 壁面滑移

Abstract: Dewetting of thin films covered by insoluble surfactant in the presence of wall slippage is considered.PDECOL program is used to simulate evolutions of film thickness and surfactant surface concentration.With perturbation wave variation of film surface,effects of several parameters on dewetting dynamics are examined.It shows that Marangoni stress shortens unstability region at small Marangoni number(M) and the unstability region is extended at large M.Decreasing capillary number leads to shorten unstability region and even restrains dewetting phenomena.The influence of slipping is closely related to M,and it accelerates perturbation growth and shorten dewetted region at small M.Increasing equilibrium film thickness leads surface deformation degree weakened and unstability region extended.Compared with exogenous surfactant,endogenous forms a shorter dewetted region and hence film stability tends improved.

Key words: surfactant, thin films, dewetting, disjoining pressure, wall slippage