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CPP: Fachverband Chemische Physik und Polymerphysik
CPP 44: Wetting, Fluidics and Liquids at Interfaces and Surfaces II (joint session CPP/DY)
CPP 44.3: Vortrag
Donnerstag, 30. März 2023, 10:00–10:15, MER 02
Spreading of soft elasto-viscoplastic droplets — •Maziyar Jalaal1, Cassio Oishi1, and Hugo França1,2 — 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.