Influence of surfactant solubility on the deformation and breakup of a bubble or capillary jet in a viscous fluid

Young, Y.-N. and Booty, M. R. and Siegel, M. and Li, J. (2009) Influence of surfactant solubility on the deformation and breakup of a bubble or capillary jet in a viscous fluid. Physics of Fluids, 21 (7). 072105. ISSN 10706631 DOI 10.1063/1.3176462

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Official URL: http://dx.doi.org/10.1063/1.3176462

Abstract

In a previous study [ M. Hameed et al., J. Fluid Mech. 594, 307 (2008) ] the authors investigated the influence of insoluble surfactant on the evolution of a stretched, inviscid bubble surrounded by a viscous fluid via direct numerical simulation of the Navier–Stokes equations, and showed that the presence of surfactant can cause the bubble to contract and form a quasisteady slender thread connecting parent bubbles, instead of proceeding directly toward pinch-off as occurs for a surfactant-free bubble. Insoluble surfactant significantly retards pinch-off and the thread is stabilized by a balance between internal pressure and reduced capillary pressure due to a high concentration of surfactant that develops during the initial stage of contraction. In the present study we investigate the influence of surfactant solubility on thread formation. The adsorption-desorption kinetics for solubility is in the diffusion controlled regime. A long-wave model for the evolution of a capillary jet is also studied in the Stokes flow limit, and shows dynamics that are similar to those of the evolving bubble. With soluble surfactant, depending on parameter values, a slender thread forms but can pinch-off later due to exchange of surfactant between the interface and exterior bulk flow.

Item Type: Article
Uncontrolled Keywords: 09AREP; BPI
Subjects: 99 - Other
Divisions: 99 - Other
Journal or Publication Title: Physics of Fluids
Volume: 21
Page Range: 072105
Identification Number: 10.1063/1.3176462
Depositing User: Sarah Humbert
Date Deposited: 21 Jul 2010 20:38
Last Modified: 23 Jul 2013 09:57
URI: http://eprints.esc.cam.ac.uk/id/eprint/1495

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