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DY: Fachverband Dynamik und Statistische Physik

DY 36: Wetting, Fluidics and Liquids at Interfaces and Surfaces I (joint session CPP/DY)

DY 36.3: Talk

Thursday, March 30, 2023, 10:00–10:15, MER 02

Spreading of soft elasto-viscoplastic droplets — •Maziyar Jalaal¹, Cassio Oishi¹, and Hugo França^1,2 — ¹Institute of Physics, University of Amsterdam, Amsterdam, The Netherlands — ²Sao Paulo State University, Sao Paulo, Brazil

The spreading under surface tension of a droplet of complex fluid with elastic and plastic properties is studied. Unlike Newtonian fluids, the droplet converges to a final equilibrium shape once the driving stresses inside the droplet fall below the critical yield stress. Scaling laws are presented for the final radius and complemented with an asymptotic analysis for shallow droplets. Moreover, numerical simulations using the volume-of-fluid method and an elastoviscoplastic (EVP) constitutive law, and experiments with an aqueous solution of Carbopol, are presented.