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Stability analysis of electro-osmotic flow in a rotating microchannel

Published online by Cambridge University Press:  15 March 2024

G.C. Shit Open the ORCID record for G.C. Shit [Opens in a new window] ,
A. Sengupta  and
Pranab K. Mondal Open the ORCID record for Pranab K. Mondal [Opens in a new window]
G.C. Shit*
Affiliation:
Department of Mathematics, Jadavpur University, Kolkata 700032, India
A. Sengupta
Affiliation:
Department of Mathematics, Jadavpur University, Kolkata 700032, India
Pranab K. Mondal
Affiliation:
Microfluidics and Microscale Transport Processes Laboratory, Department of Mechanical Engineering, Indian Institute of Technology Guwahati, Guwahati 781039, India
*
†Email address for correspondence: gcshit@jadavpuruniversity.in
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Abstract

We investigate the linear stability analysis of rotating electro-osmotic flow in confined and unconfined configurations by appealing to the Debye–Hückel approximation. Pertaining to flow in confined and unconfined domains, the stability equations are solved using the Galerkin method to obtain the stability picture. Both qualitative and quantitative aspects of Ekman spirals are examined in stable and unstable scenarios within the unconfined domain. Within the confined domain, the variation of the real growth rate and the transition to instability are analysed using the modified Routh–Hurwitz criteria, employed for the first time in this context. The stability of the underlying flow, characterized by the number of roots with a positive real part, is determined by establishing a Routhian table. The inferences of this analysis show that the velocity plane produces intriguing closed Ekman spirals, which diminish in size with an increase in the rotation speed $\omega$. The Ekman spirals in the stable region exhibit a distinct discontinuity, indicating the dissipation of disturbances over time. In the confined domain, the flow appears consistently stable for a set of involved parameters pertinent to this analysis, such as electrokinetic parameter $K=1.5$ and rotational parameter $\omega$ approximately up to $6$. However, the flow instabilities become evident for $K=1.5$ and $\omega \geq 6$.

JFM classification

Flow Control: Instability control Geophysical and Geological Flows: Rotating flows Micro-/Nano-fluid dynamics: Microfluidics
Type
JFM Papers
Information
Journal of Fluid Mechanics , Volume 983 , 25 March 2024 , A13
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Copyright
© The Author(s), 2024. Published by Cambridge University Press

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