Interfacial dynamics of thin viscoelastic films and drops

Document Type

Article

Publication Date

11-1-2016

Abstract

We present a computational investigation of thin viscoelastic films and drops on a solid substrate subject to the van der Waals interaction force, in two spatial dimensions. The governing equations are obtained within a long-wave approximation of the Navier-Stokes equations with Jeffreys model for viscoelastic stresses. We investigate the effects of viscoelasticity, Newtonian viscosity, and the substrate slippage on the dynamics of thin viscoelastic films. We also study the effects of viscoelasticity on drops that spread or recede on a prewetted substrate. For dewetting films, the numerical results show the presence of multiple secondary droplets for higher values of elasticity, consistently with experimental findings. For drops, we find that elastic effects lead to deviations from the Cox-Voinov law for partially wetting fluids. In general, elastic effects enhance spreading, and suppress retraction, compared to Newtonian ones.

Identifier

84991696890 (Scopus)

Publication Title

Journal of Non Newtonian Fluid Mechanics

External Full Text Location

https://doi.org/10.1016/j.jnnfm.2016.10.001

ISSN

03770257

First Page

26

Last Page

38

Volume

237

Grant

DMS-1320037

Fund Ref

National Science Foundation

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