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Critical selection of shear sheltering in electroconvective flow from chaotic to steady state

Published online by Cambridge University Press:  01 August 2022

Wei Liu Open the ORCID record for Wei Liu [Opens in a new window] ,
Yueting Zhou Open the ORCID record for Yueting Zhou [Opens in a new window]  and
Pengpeng Shi Open the ORCID record for Pengpeng Shi [Opens in a new window]
Wei Liu
Affiliation:
School of Aerospace Engineering and Applied Mechanics, Tongji University, Shanghai 200092, PR China Shanghai Key Lab of Vehicle Aerodynamics and Vehicle Thermal Management Systems, Shanghai 201804, PR China
Yueting Zhou*
Affiliation:
School of Aerospace Engineering and Applied Mechanics, Tongji University, Shanghai 200092, PR China Shanghai Key Lab of Vehicle Aerodynamics and Vehicle Thermal Management Systems, Shanghai 201804, PR China
Pengpeng Shi*
Affiliation:
School of Civil Engineering, Xi'an University of Architecture and Technology, Xi'an 710055, Shaanxi, PR China State Key Laboratory for Strength and Vibration of Mechanical Structures, Shaanxi Engineering Research Centre of NDT and Structural Integrity Evaluation, School of Aerospace, Xi'an Jiaotong University, Xi'an 710049, Shaanxi, PR China
*
†Email addresses for correspondence: zhouyt@tongji.edu.cn, shipengpeng@xjtu.edu.cn
†Email addresses for correspondence: zhouyt@tongji.edu.cn, shipengpeng@xjtu.edu.cn
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Abstract

Ion and water are transported by electroconvection near permselective membranes, resulting in complex phenomena associated with the flow–fines interaction. Sheltering the flow chaos by the shear flow is a common strategy in plasma fluids and has recently been successfully applied to control ionic fluids. The paper herein reveals the critical selection of shear velocity regarding the fluid from a chaotic to a steady state through numerical and theoretical analyses. For the shear sheltering, the dimensionless Debye length ${\lambda _D}$ with varying channel height is introduced to achieve a comprehensive discussion of the factors and laws affecting the shear vortex state. Based on an analysis of the vortex driving mechanism, the scaling of the slip velocity ${u_s}\sim {(\lambda _D^{ - 1}\Delta {\phi ^4})^{1/3}}$ is recommended as the critical selection factor for the steady and chaotic state under a fixed shear flow velocity, which involves the dimensionless Debye length ${\lambda _D}$ and voltage difference $\Delta \phi $. Furthermore, for ionic fluid control by shear flow, a critical shear velocity ${U_{HPC}}$ is proposed to distinguish the electroconvective flow from a chaotic state to a steady state. When the shear flow velocity ${U_{HP}} > {U_{HPC}}$, the shear flow shelters chaos, and the scaling law is also recommended for the regulation of the critical shear flow velocity ${U_{HPC}}$ jointly by ${\lambda _D}$ and $\Delta \phi $. The analysis is confirmed by direct numerical simulation and existing experimental data (J. Fluid Mech, vol. 813, 2017, pp. 799–823). This work provides a more comprehensive physical insight for shear sheltering and affects the design of electromembrane microfluidics.

JFM classification

MHD and Electrohydrodynamics: Electrokinetic flows Micro-/Nano-fluid dynamics: Microscale transport Flow Control: Instability control
Type
JFM Papers
Information
Journal of Fluid Mechanics , Volume 946 , 10 September 2022 , A3
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Copyright
© The Author(s), 2022. Published by Cambridge University Press

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