Phase-field modeling droplet dynamics with soluble surfactants

Liu, H. and Zhang, Y.H. (2010) Phase-field modeling droplet dynamics with soluble surfactants. Journal of Computational Physics, 229 (24). pp. 9166-9187. ISSN 0021-9991

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Abstract

Using lattice Boltzmann approach, a phase-field model is proposed for simulating droplet motion with soluble surfactants. The model can recover the Langmuir and Frumkin adsorption isotherms in equilibrium. From the equilibrium equation of state, we can determine the interfacial tension lowering scale according to the interface surfactant concentration. The model is able to capture short-time and long-time adsorption dynamics of surfactants. We apply the model to examine the effect of soluble surfactants on droplet deformation, breakup and coalescence. The increase of surfactant concentration and attractive lateral interaction can enhance droplet deformation, promote droplet breakup, and inhibit droplet coalescence. We also demonstrate that the Marangoni stresses can reduce the interface mobility and slow down the film drainage process, thus acting as an additional repulsive force to prevent the droplet coalescence.

Author(s):Liu, H. and Zhang, Y.H. ORCID logoORCID: https://orcid.org/0000-0002-0683-7050
Item type:Article
ID code:27077
Keywords:phase field model, lattice boltzmann model, soluble surfactant, marangoni stress, Frumkin adsorption, droplet breakup, coalescence, Mechanical engineering and machinery, Physics, Physics and Astronomy (miscellaneous), Computer Science Applications
Subjects:Technology > Mechanical engineering and machinery
Science > Physics
Department:Faculty of Engineering > Mechanical and Aerospace Engineering
Depositing user: Ms Katrina May
Date deposited:30 Aug 2010 12:49
Last modified:11 Oct 2019 04:31
URI:https://strathprints.strath.ac.uk/id/eprint/27077
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