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Marangoni instability in a viscoelastic binary film with cross-diffusive effect

Published online by Cambridge University Press:  15 January 2021

Rajkumar Sarma Open the ORCID record for Rajkumar Sarma [Opens in a new window]  and
Pranab Kumar Mondal Open the ORCID record for Pranab Kumar Mondal [Opens in a new window]
Rajkumar Sarma
Affiliation:
Department of Mechanical Engineering, Indian Institute of Technology Guwahati, Guwahati, Assam781039, India
Pranab Kumar Mondal*
Affiliation:
Department of Mechanical Engineering, Indian Institute of Technology Guwahati, Guwahati, Assam781039, India
*
† Email address for correspondence: mail2pranab@gmail.com
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Abstract

Viscoelastic liquids are usually blends of a polymeric solute and a Newtonian solvent. In the presence of a temperature gradient, stratification of these solutes can take place via the Soret effect. Here, we investigate the classical Marangoni instability problem for a thin viscoelastic film considering this binary aspect of the liquid. The film, bounded above by a deformable free surface, is subjected to heating from below by a solid substrate. Linear stability analysis performed numerically for perturbations of finite wavelength (short-wave perturbations) reveals that both monotonic and oscillatory instabilities can emerge in this system. In the presence of Soret diffusion, the interaction between thermocapillary and solutocapillary forces is found to give rise to two different oscillatory instabilities, of which one mode was overlooked previously, even for the Newtonian binary mixtures. As a principal result of this work, we provide a complete picture of the susceptibility to different instability modes based on model parameter values. Finally, an approximate model is developed under the framework of long-wave analysis, which can qualitatively depict the stability behaviour of the system without numerically solving the problem.

JFM classification

Convection: Marangoni convection Interfacial Flows (free surface): Thin films Non-Newtonian Flows: Viscoelasticity
Type
JFM Papers
Information
Journal of Fluid Mechanics , Volume 910 , 10 March 2021 , A30
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Copyright
© The Author(s), 2021. Published by Cambridge University Press

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