Drop oscillation and mass transfer in alternating electric fields

Carleson, T.E.

doi:10.2172/6974824

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“…26 The experimental investigation of mass transfer at a liquid− liquid interface under an electric field involves several technical difficulties. 15 The drop profile analysis could be an easier and straightforward method provided that the interfacial properties of an interface under an electric field are directly measured. This paper demonstrates experimental observations on enhanced mass transport at a water−oil interface when exposed to an electric field.…”

Section: ■ Introductionmentioning

confidence: 99%

“…Previous studies in the literature reported observations that suggested stimulation of mass transfer at liquid interfaces under an electric field. − However, these studies either lacked a thorough analysis of the observations or were inconclusive. Some earlier studies speculated that an increase in ion density at a fluid interface under an electric field is responsible for the altered surface tension. − A liquid drop surrounded by another immiscible liquid and exposed to an electric field assumes a new shape.…”

Section: Introductionmentioning

confidence: 99%

“…The experimental investigation of mass transfer at a liquid–liquid interface under an electric field involves several technical difficulties . The drop profile analysis could be an easier and straightforward method provided that the interfacial properties of an interface under an electric field are directly measured.…”

Section: Introductionmentioning

confidence: 99%

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Experimental Evidence of Enhanced Adsorption Dynamics at Liquid–Liquid Interfaces under an Electric Field

2020

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In this work we investigate adsorption of surface active compounds at water-oil interface subjected to an electric eld. A uid system comprising a pendent water drop surrounded by an asphaltene-rich organic phase is exposed to a DC uniform electric eld.Two sub-fractions of asphaltenes having contrasting anities to water-oil interface are used as surface active compounds. The microscopic changes in the drop shape, as a result of asphaltene adsorption, are captured and the drop proles are analyzed by using our in-house code for axisymmetric drop shape analysis (ADSA) under electric eld.The estimates of dynamic interfacial tension under dierent strengths of the eld (E 0 ) and concentrations of the asphaltene sub-fractions (C) are used to calculate adsorption dynamics and surface excess. The experimental observations and careful analysis of the data suggest that the externally applied electric eld signicantly stimulates the mass transfer rate at a liquid-liquid interface. The enhancement in mass transport at 1 water-oil interface can be attributed to the axisymmetric electrohydrodynamic uid ows generated on either sides of the interface. The boost in mass transport is evident from the growing decay in equilibrium interfacial tension (γ eq ) and increased surface excess (Γ eq ) upon increasing strength of the applied electric eld. The mass transfer intensication does not increase monotonously with the electric eld strength above an optimum E 0 , which is in agreement with previous theoretical studies in the literature.However, these rst explicit experimental measurements of adsorption at an interface under electric eld suggest that the optimum E 0 is determined by characteristics of the surface active molecules.

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Section: ■ Introductionmentioning

confidence: 99%