We study the effect of surfactant on the pairwise interactions of drops in an applied uniform dc electric field using a combination of numerical simulations based on a boundary integral formulation and an analytical theory assuming small drop deformations. The surfactant is assumed to be insoluble in the bulk-phase fluids. We show that the surfactant weakens the electrohydrodynamic flow, and thus dielectrophoretic interactions play a more prominent role in the dynamics of surfactant-covered drops compared to clean drops. If drop conductivity is the same as the suspending fluid, a nondiffusing surfactant can arrest the drops' relative motion thereby effectively preventing coalescence.

Pairwise interactions of surfactant-covered drops in a uniform electric field / Sorgentone, Chiara; Vlahovska, Petia M.. - In: PHYSICAL REVIEW FLUIDS. - ISSN 2469-990X. - 6:5(2021). [10.1103/PhysRevFluids.6.053601]

Pairwise interactions of surfactant-covered drops in a uniform electric field

Sorgentone, Chiara
Primo
;
2021

Abstract

We study the effect of surfactant on the pairwise interactions of drops in an applied uniform dc electric field using a combination of numerical simulations based on a boundary integral formulation and an analytical theory assuming small drop deformations. The surfactant is assumed to be insoluble in the bulk-phase fluids. We show that the surfactant weakens the electrohydrodynamic flow, and thus dielectrophoretic interactions play a more prominent role in the dynamics of surfactant-covered drops compared to clean drops. If drop conductivity is the same as the suspending fluid, a nondiffusing surfactant can arrest the drops' relative motion thereby effectively preventing coalescence.
2021
boundary integral method; drop interaction; surfactant
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Pairwise interactions of surfactant-covered drops in a uniform electric field / Sorgentone, Chiara; Vlahovska, Petia M.. - In: PHYSICAL REVIEW FLUIDS. - ISSN 2469-990X. - 6:5(2021). [10.1103/PhysRevFluids.6.053601]
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11573/1552805
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