Lifetime of Surface Bubbles in Surfactant Solutions

Langmuir : the ACS Journal of Surfaces and Colloids
O AtasiB Scheid

Abstract

Despite the prevalence of surface bubbles in many natural phenomena and engineering applications, the effect of surfactants on their surface residence time is not clear. Numerous experimental studies and theoretical models exist but a clear understanding of the film drainage phenomena is still lacking. In particular, theoretical work predicting the drainage rate of the thin film between a bubble and the free surface in the presence and absence of surfactants usually makes use of the lubrication theory. On the other hand, in numerous natural situations and experimental works, the bubble approaches the free surface from a certain distance and forms a thin film at a later stage. This article attempts to bridge these two approaches. In particular, in this article, we review these works and compare them to our direct numerical simulations where we study the coupled influence of bubble deformation and surfactants on the rising and drainage process of a bubble beneath a free surface. In the present study, the level-set method is used to capture the air-liquid interfaces, and the transport equation of surfactants is solved in an Eulerian framework. The axisymmetric simulations capture the bubble acceleration, deformation, and rest (or ...Continue Reading

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Citations

Jul 6, 2020·Scientific Reports·G RageR Zenit
Jul 9, 2021·Langmuir : the ACS Journal of Surfaces and Colloids·Valery V Belousov, Sergey V Fedorov

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