Marangoni instability in a thin film heated from below: Effect of nonmonotonic dependence of surface tension on temperature

Physical Review. E
Rajkumar Sarma, Pranab Kumar Mondal

Abstract

We investigate Marangoni instability in a thin liquid film resting on a substrate of low thermal conductivity and separated from the surrounding gas phase by a deformable free surface. Considering a nonmonotonic variation of surface tension with temperature, here we analytically derive the neutral stability curve for the monotonic and oscillatory modes of instability (for both the long-wave and short-wave perturbations) under the framework of linear stability analysis. For the long-wave instability, we derive a set of amplitude equations using the scaling k∼(Bi)^{1/2}, where k is the wave number and Bi is the Biot number. Through this investigation, we demonstrate that for such a fluid layer upon heating from below, both monotonic and oscillatory instability can appear for a certain range of the dimensionless parameters, viz., Biot number (Bi), Galileo number (Ga), and inverse capillary number (Σ). Moreover, we unveil, through this study, the influential role of the above-mentioned parameters on the stability of the system and identify the critical values of these parameters above which instability initiates in the liquid layer.

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Citations

Sep 11, 2019·Physical Review. E·Rajkumar Sarma, Pranab Kumar Mondal
May 22, 2019·Physical Review. E·Youchuang Chao, Zijing Ding
Apr 16, 2021·Electrophoresis·Pranab Kumar Mondal, Manideep Roy

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