A multiphase model for exploring electrochemical Marangoni flow

[Display omitted] •Interfacial dynamics due to electrochemically generated Marangoni flow.•A novel multiphase framework based on the VOF method.•Computation of transient electric potential, current density, and flow fields.•Relationship between the interfacial tension and electric current density.•E...

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Bibliographic Details
Published in:	Electrochemistry communications Vol. 155; p. 107567
Main Authors:	Karimi-Sibaki, E., Vakhrushev, A., Kadylnykova, A., Wu, M., Ludwig, A., Bohacek, J., Kharicha, A.
Format:	Journal Article
Language:	English
Published:	Elsevier B.V 01-10-2023 Elsevier
Subjects:	Droplet elongation Electro-Marangoni flow Eutectic gallium indium alloy (EGaIn) Interfacial tension modulation Volume of fluid (VOF) Interfacial tension modulation Volume of fluid (VOF) Droplet elongation Electro-Marangoni flow Eutectic gallium indium alloy (EGaIn)
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Summary:	[Display omitted] •Interfacial dynamics due to electrochemically generated Marangoni flow.•A novel multiphase framework based on the VOF method.•Computation of transient electric potential, current density, and flow fields.•Relationship between the interfacial tension and electric current density.•Elongation of the EGaIn droplet in NaOH electrolyte system. A multiphase numerical model based on the volume of fluid (VOF) method is proposed to simulate the transient, electrochemically-generated Marangoni flow in a system comprising a NaOH electrolyte and a eutectic gallium–indium (EGaIn) metal droplet. The model incorporates appropriate equations to accurately represent the transport phenomena, including flow, electric potential, and electric current density, within the entire system. The model includes the transient variation in the interfacial tension as a function of electric current density at the interface, leading to the generation of Marangoni flow and enabling the tracking of droplet shape evolution. Notably, the model successfully captures the elongation of the droplet towards the cathode, which is validated through comparison with available experimental data.
ISSN:	1388-2481 1873-1902
DOI:	10.1016/j.elecom.2023.107567