Spreading of a viscoelastic drop on a solid substrate

We study the spreading of viscous and viscoelastic drops on solid substrates with different wettability. In the early stages of spreading, we find that the viscoelastic drop spreads with faster and a different power law than the Newtonian drop (i.e. aqueous glycerine solution) for the same zero shea...

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Bibliographic Details
Published inarXiv.org
Main Authors Rostami, Peyman, Fricke, Mathis, Schubotz, Simon, Patel, Himanshu, Azizmalayeri, Reza, Auernhammer, Güunter K
Format Paper Journal Article
LanguageEnglish
Published Ithaca Cornell University Library, arXiv.org 29.08.2023
Subjects
Perturbation
Physics - Fluid Dynamics
Physics - Soft Condensed Matter
Relaxation time
Shear rate
Substrates
Viscoelasticity
Viscosity
Wettability
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Summary:We study the spreading of viscous and viscoelastic drops on solid substrates with different wettability. In the early stages of spreading, we find that the viscoelastic drop spreads with faster and a different power law than the Newtonian drop (i.e. aqueous glycerine solution) for the same zero shear rate viscosity. We argue that the effect of viscoelasticity is only observable for experimental time scales in the order of the internal relaxation time of the polymer solution or longer times. Near the contact line, the effective viscosity is lower for the viscoelastic drop than for the Newtonian drop. Together with its shear rate dependency, this difference in effective viscosity can explain the different spreading dynamics. We support our experimental findings with a simple perturbation model that qualitatively agrees with our findings.
ISSN:2331-8422
DOI:10.48550/arxiv.2308.14515