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Dynamics of Rear Stagnant Cap formation at the surface of spherical bubbles rising in surfactant solutions at large Reynolds numbers under conditions of small Marangoni number and slow sorption kinetics
, Article Advances in Colloid and Interface Science ; Volume 222 , 2015 , Pages 260-274 ; 00018686 (ISSN) ; Kovalchuk, V. I ; Gochev, G. G ; Lotfi, M ; Krzan, M ; Malysa, K ; Miller, R ; Sharif University of Technology
Elsevier
2015
Abstract
On the surface of bubbles rising in a surfactant solution the adsorption process proceeds and leads to the formation of a so called Rear Stagnant Cap (RSC). The larger this RSC is the stronger is the retardation of the rising velocity. The theory of a steady RSC and steady retarded rising velocity, which sets in after a transient stage, has been generally accepted. However, a non-steady process of bubble rising starting from the initial zero velocity represents an important portion of the trajectory of rising, characterized by a local velocity profile (LVP). As there is no theory of RSC growth for large Reynolds numbers Re « 1 so far, the interpretation of LVPs measured in this regime was...