A numerical investigation on the drainage of a surfactant-modified water droplet in paraffin oil

Advances in Colloid and Interface Science
Adil LekhlifiMickaël Antoni

Abstract

A volume of fluid approach is used in numerical simulations of the settling motion of a surfactant modified water droplet in a continuous paraffin oil phase. The droplet is millimeter-sized and confined in a square two dimensional domain. The surfactant interfacial and bulk concentration-equations are solved together with the incompressible Navier-Stokes equation. The role of boundary walls in the overall settling dynamics is described. As the droplet moves downwards the interfacial shear creates non-homogeneous interfacial surfactant concentrations and Marangoni driven phenomena come into play. A decrease of the drainage velocity is then evidenced indicating that buoyancy forces are counter balanced by Marangoni induced lift-forces. The lateral migration of the droplet due to boundary wall proximity is discussed. It is shown to increase with wall proximity and to decrease when increasing the interfacial concentration. Finally, a simplified model is used to investigate the evolution of the bulk concentration assuming the surfactant is insoluble in paraffin oil and poorly soluble in water.

References

Nov 20, 1998·Journal of Colloid and Interface Science·C D Eggleton, K J Stebe
Jul 12, 2001·Journal of Colloid and Interface Science·Xiao-jin Li Xj, Zai-Sha Mao
Jan 18, 2006·Journal of Colloid and Interface Science·Ivan B BazhlekovHan E H Meijer
Oct 1, 2008·Langmuir : the ACS Journal of Surfaces and Colloids·Fabien Girard, Mickaël Antoni

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Citations

Mar 31, 2018·Langmuir : the ACS Journal of Surfaces and Colloids·Antoine RiaudGuangsheng Luo

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