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Role of viscosity coefficients during spreading and coalescence of droplets in liquids

Bibin M. Jose and Thomas Cubaud
Phys. Rev. Fluids 2, 111601(R) – Published 10 November 2017

Abstract

The role of absolute viscosities on the dynamics of droplet spreading on solids and droplet-droplet coalescence in liquid-liquid systems is experimentally characterized for a broad range of fluid parameters. We show in particular the existence of a viscous function based on both inner and outer fluid viscosities that allows for the determination of the critical wetting velocity and the evolution of contact diameters during immersed spreading and coalescence of droplets. This work quantifies the cooperative effects of fluid viscosities on droplet dynamics as well as their overall reduced influence from initial wetting to spreading and coalescence, which provides insights into the role of wetting contact lines on spontaneous capillary phenomena.

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  • Received 6 August 2017

DOI:https://doi.org/10.1103/PhysRevFluids.2.111601

©2017 American Physical Society

Physics Subject Headings (PhySH)

Fluid Dynamics

Authors & Affiliations

Bibin M. Jose and Thomas Cubaud*

  • Department of Mechanical Engineering, Stony Brook University, Stony Brook, New York 11794-2300, USA

  • *Author to whom correspondence should be addressed: thomas.cubaud@stonybrook.edu

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Issue

Vol. 2, Iss. 11 — November 2017

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