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Electroosmotic flow measurements in a freely suspended liquid film: Experiments and numerical simulations

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journal contribution
posted on 2017-04-25, 13:19 authored by Abdulkadir Hussein Sheik, Hemaka BandulasenaHemaka Bandulasena, Victor Starov, Anna TrybalaAnna Trybala
Fluid flow profiles in free liquid films stabilised by anionic and cationic surfactants under an external electric field were investigated. Depthwise velocity fields were measured at the mid region of the free liquid film by confocal μ-PIV and corresponding numerical simulations were performed using Finite Element Method (FEM) to model the system. Depthwise change in velocity profiles was observed with electroosmotic flow dominating in the vicinity of the gas-liquid and solid-liquid interfaces while backpressure drives fluid in the opposite direction at the core of the film. It was also found that the direction of the flow at various sections of the films depends on the type of surfactant used, but flow features remained the same. Numerical simulations predicted the flow profiles with reasonable accuracy; however, asymmetry of the actual film geometry caused deviations at the top half of the computational domain. Overall, electroosmotic flow profiles within a free liquid film is similar to that of the closed-end solid microchannel. However, the flow direction and features of the velocity profiles can be changed by selecting various types of surfactants. The free liquid films thickness was selected to match dimensions of foam Plateau border. Hence these findings will be useful in developing a separation system based on foam electrokinetics.

History

School

  • Aeronautical, Automotive, Chemical and Materials Engineering

Department

  • Chemical Engineering

Published in

ELECTROPHORESIS

Citation

HUSSEIN SHEIK, A. ...et al., 2017. Electroosmotic flow measurements in a freely suspended liquid film: experiments and numerical simulations. ELECTROPHORESIS, 38 (20), pp. 2554–2560.

Publisher

© Wiley

Version

  • AM (Accepted Manuscript)

Publisher statement

This work is made available according to the conditions of the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International (CC BY-NC-ND 4.0) licence. Full details of this licence are available at: https://creativecommons.org/licenses/by-nc-nd/4.0/

Publication date

2017

Notes

This is the peer reviewed version of the following article: HUSSEIN SHEIK, A. ...et al., 2017. Electroosmotic flow measurements in a freely suspended liquid film: experiments and numerical simulations. ELECTROPHORESIS, 38 (20), pp. 2554–2560., which has been published in final form at http://dx.doi.org/10.1002/elps.201600549. This article may be used for non-commercial purposes in accordance with Wiley Terms and Conditions for Self-Archiving.

ISSN

0173-0835

Language

  • en

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