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Applied Mechanics
Volume 3
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10.3390/applmech3010005
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Article

Effect of Permittivity on the Electric-Field-Driven Rotation Dynamics in a Liquid Film

by
Reza Shirsavar
1,
Saeid Mollaei
1,
Mansoure Moeini Rizi
2,
Ali-Reza Moradi
3,4,
Ahmad Amjadi
5,
Mehdi Habibi
6,* and
Ali Najafi
3,7
1
Department of Physics, Faculty of Science, University of Zanjan, Zanjan 45371-38791, Iran
2
Department of Physics, Arizona State University, Tempe, AZ 85287, USA
3
Department of Physics, Institute for Advanced Studies in Basic Sciences (IASBS), Zanjan 45137-66731, Iran
4
School of Nano Science, Institute for Research in Fundamental Sciences (IPM), Tehran 19538-33511, Iran
5
Department of Physics, Sharif University of Technology, Tehran 19538-33511, Iran
6
Physics and Physical Chemistry of Foods, Department of Agrotechnology and Food Sciences, Wageningen University, 6708 WG Wageningen, The Netherlands
7
Research Center for Basic Sciences & Modern Technologies (RBST), Institute for Advanced Studies in Basic Sciences, Zanjan 45137-66731, Iran
*
Author to whom correspondence should be addressed.
Appl. Mech. 2022, 3(1), 78-87; https://doi.org/10.3390/applmech3010005
Submission received: 3 November 2021 / Revised: 27 December 2021 / Accepted: 28 December 2021 / Published: 7 January 2022
(This article belongs to the Special Issue Exclusive Papers of the Editorial Board Members (EBMs) of Applied Mechanics (Volume II))
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Abstract

Applying a constant electric field on a suspended film of liquid that carries an electric current, either by the transport of ions or surface charges, induces a rotation in the film. This system is known as “liquid film motor”. So far, the effect of permittivity of the liquid on its rotation has been ignored. We showed that the permittivity of the liquid can significantly affect the dynamics of rotation. Using an experimental approach, we studied the liquid film rotation for a broad range of pure liquids with diverse permittivities and surface tensions. We observed two different regimes of rotation depending on the permittivity of the liquids. We also found that there is no correlation between the surface tension of the liquid and the angular velocity of the rotation. We considered a theoretical framework and suggested scenarios to explain our experimental observations. These results help in better understanding the physics of liquid film motors and suggest opportunities for new flow manipulation techniques at small scales.
Keywords: liquid film motor; permittivity; liquid film; electric-field-driven rotation liquid film motor; permittivity; liquid film; electric-field-driven rotation

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MDPI and ACS Style

Shirsavar, R.; Mollaei, S.; Moeini Rizi, M.; Moradi, A.-R.; Amjadi, A.; Habibi, M.; Najafi, A. Effect of Permittivity on the Electric-Field-Driven Rotation Dynamics in a Liquid Film. Appl. Mech. 2022, 3, 78-87. https://doi.org/10.3390/applmech3010005

AMA Style

Shirsavar R, Mollaei S, Moeini Rizi M, Moradi A-R, Amjadi A, Habibi M, Najafi A. Effect of Permittivity on the Electric-Field-Driven Rotation Dynamics in a Liquid Film. Applied Mechanics. 2022; 3(1):78-87. https://doi.org/10.3390/applmech3010005

Chicago/Turabian Style

Shirsavar, Reza, Saeid Mollaei, Mansoure Moeini Rizi, Ali-Reza Moradi, Ahmad Amjadi, Mehdi Habibi, and Ali Najafi. 2022. "Effect of Permittivity on the Electric-Field-Driven Rotation Dynamics in a Liquid Film" Applied Mechanics 3, no. 1: 78-87. https://doi.org/10.3390/applmech3010005

APA Style

Shirsavar, R., Mollaei, S., Moeini Rizi, M., Moradi, A.-R., Amjadi, A., Habibi, M., & Najafi, A. (2022). Effect of Permittivity on the Electric-Field-Driven Rotation Dynamics in a Liquid Film. Applied Mechanics, 3(1), 78-87. https://doi.org/10.3390/applmech3010005

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