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On the compound sessile drops: configuration boundaries and transitions

Published online by Cambridge University Press:  28 April 2021

Chun-Yu Zhang ,
Peng Gao Open the ORCID record for Peng Gao [Opens in a new window] ,
Er-Qiang Li Open the ORCID record for Er-Qiang Li [Opens in a new window]  and
Hang Ding Open the ORCID record for Hang Ding [Opens in a new window]
Chun-Yu Zhang
Affiliation:
Department of Modern Mechanics, University of Science and Technology of China, Hefei230027, PR China
Peng Gao
Affiliation:
Department of Modern Mechanics, University of Science and Technology of China, Hefei230027, PR China
Er-Qiang Li
Affiliation:
Department of Modern Mechanics, University of Science and Technology of China, Hefei230027, PR China
Hang Ding*
Affiliation:
Department of Modern Mechanics, University of Science and Technology of China, Hefei230027, PR China
*
†Email address for correspondence: [email protected]
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Abstract

The geometry of compound sessile drops at equilibrium on a flat substrate can exhibit a variety of complicated morphological configurations. In this paper, we first investigate the configuration boundaries of the compound sessile drops in a wide parameter space, where a specific configuration is not stable outside its boundaries. Then, we focus on the transitions among the axisymmetric configurations, i.e. encapsulation, lens and collars. The configuration transitions result from the variation of the wettability of the substrate and the volume ratio of the two component droplets. With the help of theoretical analysis and numerical simulations, we obtain previously unidentified criteria for the onset of configuration transition, identify the irreversible and reversible configuration transitions, reveal the dynamic behaviours of configuration transitions that are not accessible to theoretical analysis, and provide a further step towards the ultimate purpose of such work, which is the controllable reconfiguration of the compound sessile drops.

JFM classification

Drops and Bubbles: Drops Interfacial Flows (free surface): Capillary flows
Type
JFM Papers
Information
Journal of Fluid Mechanics , Volume 917 , 25 June 2021 , A37
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Copyright
© The Author(s), 2021. Published by Cambridge University Press

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References

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