Interplay of bulk soluble surfactants and interfacial kinetics governs the stability of two-layer channel flows

Chakraborty, Gourab; Pramanik, Satyajit; Ghosh, Uddipta

doi:10.1039/d3sm01109g

Soft Matter

2023

DOI: 10.1039/d3sm01109g

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Interplay of bulk soluble surfactants and interfacial kinetics governs the stability of two-layer channel flows

Gourab Chakraborty,

Satyajit Pramanik,

Uddipta Ghosh

Abstract: The linear stability of two-layer channel flows in the presence of bulk-soluble surfactants is investigated here, taking into account the rheological properties of the interface. The interfacial stresses are quantified...

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2024

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Cited by 2 publications

References 52 publications

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Unlocking the potential: Transforming hazardous waste into solid cementitious materials

Hou,

Liu,

2024

Journal of Cleaner Production

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Unlocking the potential: Transforming hazardous waste into solid cementitious materials

Hou,

Liu,

2024

Journal of Cleaner Production

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Coupled bulk and interfacial transport of surfactants governs the settling of a drop towards a wall

Jadhav,

Mandal,

Ghosh

2024

J. Fluid Mech.

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Surfactant-like impurities are omnipresent in multiphase emulsions and may substantially affect the motion of small droplets by altering their interfacial properties. Usually these surfactants are soluble in the bulk and undergo adsorption–desorption onto the interface which modifies their surface concentration and hence their overall influence on droplet motion. Yet, the impact of the bulk solubility and transport of surfactants on droplet dynamics, especially in the presence of bounding walls, remains poorly understood. As such, in this article, we assess the impact of bulk soluble surfactants on the settling of a spherical drop towards a plane wall. We consider coupled bulk and interfacial transport of surfactants, mediated by adsorption–desorption processes and construct a semi-analytical framework for arbitrary values of ‘bulk interaction parameter’, which dictates the strength of adsorption–desorption kinetics compared with bulk diffusion. Our results indicate that while mass exchange between the bulk and the interface can remobilize the drop, a finite bulk diffusion rate restricts this process and therefore slows down the drop. This also results in bulk concentration depletion near the south pole and accumulation near the north pole, the extent of which becomes strongly asymmetric with an enhanced intensity of depletion, as the drop approaches the wall. Presence of the wall and bulk solubility are found to aid each other towards remobilizing the drop by aptly modifying the interfacial concentration. Our results may provide fundamental insights into the kinetics of surfactant-laden drops, with potential applications in food and pharmaceutical industries, separation processes, etc.

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Interplay of bulk soluble surfactants and interfacial kinetics governs the stability of two-layer channel flows

Abstract: The linear stability of two-layer channel flows in the presence of bulk-soluble surfactants is investigated here, taking into account the rheological properties of the interface. The interfacial stresses are quantified...

Cited by 2 publications

References 52 publications

Unlocking the potential: Transforming hazardous waste into solid cementitious materials

Unlocking the potential: Transforming hazardous waste into solid cementitious materials

Coupled bulk and interfacial transport of surfactants governs the settling of a drop towards a wall

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