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Spreading of a viscoelastic drop on a solid substrate

Published online by Cambridge University Press:  24 July 2024

Peyman Rostami Open the ORCID record for Peyman Rostami [Opens in a new window] ,
Mathis Fricke Open the ORCID record for Mathis Fricke [Opens in a new window] ,
Simon Schubotz Open the ORCID record for Simon Schubotz [Opens in a new window] ,
Himanshu Patel ,
Reza Azizmalayeri Open the ORCID record for Reza Azizmalayeri [Opens in a new window]  and
Günter K. Auernhammer Open the ORCID record for Günter K. Auernhammer [Opens in a new window]
Peyman Rostami*
Affiliation:
Leibniz-Institut für Polymerforschung Dresden e.V. Hohe Straße 6, 01069 Dresden, Germany
Mathis Fricke
Affiliation:
Department of Mathematics, TU Darmstadt, Schlossgartenstraße 7, 64289 Darmstadt, Germany
Simon Schubotz
Affiliation:
Leibniz-Institut für Polymerforschung Dresden e.V. Hohe Straße 6, 01069 Dresden, Germany TU Dresden, Dresden 01062, Germany
Himanshu Patel
Affiliation:
Leibniz-Institut für Polymerforschung Dresden e.V. Hohe Straße 6, 01069 Dresden, Germany
Reza Azizmalayeri
Affiliation:
Leibniz-Institut für Polymerforschung Dresden e.V. Hohe Straße 6, 01069 Dresden, Germany
Günter K. Auernhammer*
Affiliation:
Leibniz-Institut für Polymerforschung Dresden e.V. Hohe Straße 6, 01069 Dresden, Germany
*
†Email addresses for correspondence: rostami@ipfdd.de, auernhammer@ipfdd.de
†Email addresses for correspondence: rostami@ipfdd.de, auernhammer@ipfdd.de
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Abstract

We study the spreading of Newtonian viscous (aqueous glycerin solution) and viscoelastic (aqueous polymer solution) drops on solid substrates with different wettabilities. For drops of the same zero-shear viscosity, we find in the early stages of spreading that viscoelastic drops (i) spread faster and (ii) their contact radius shows a different power law vs time than Newtonian drops. We argue that the effect of viscoelasticity is only observable for experimental time scales of the order of or larger than the internal relaxation time of the viscoelastic polymer solution. We attribute this behaviour to the shear thinning of the viscoelastic polymer solution. When approaching the contact line, the shear rate increases and the steady-state viscosity of the viscoelastic drop is lower than that of the Newtonian drop. We support our experimental findings with a simple (first-order) perturbation model that qualitatively agrees with our findings.

JFM classification

Drops and Bubbles: Drops Non-Newtonian Flows: Viscoelasticity
Type
JFM Papers
Information
Journal of Fluid Mechanics , Volume 988 , 10 June 2024 , A51
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Copyright
© The Author(s), 2024. Published by Cambridge University Press

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