Dresden 2017 – wissenschaftliches Programm

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DY: Fachverband Dynamik und Statistische Physik

DY 57: Posters - Turbulence

DY 57.3: Poster

Donnerstag, 23. März 2017, 17:00–19:30, P1A

Modeling drying mixture droplets on porous substrates — •Christian Diddens¹, Hans Kuerten^1,2, Cees van der Geld¹, and Herman Wijshoff^1,3 — ¹Eindhoven University of Technology, The Netherlands — ²University of Twente, The Netherlands — ³Océ Technologies B.V., Venlo, The Netherlands

Inspired by the typical composition of water-based inks in inkjet printing processes, we have developed a numerical model for the drying of sessile multi-component droplets on porous substrates. Due to different volatilities of the components, a composition gradient is induced in the droplet. Since the physical properties of the liquid, i.e. the mass density, viscosity, surface tension and the mutual diffusion coefficient, depend on the local fluid composition and the local temperature, the flow in the droplet is governed by a complicated spatio-temporal interplay of preferential evaporation, evaporative cooling, solutal and thermal Marangoni flow and absorption of liquid into the pores of the substrate. It is shown how preferential evaporation can drastically influence the absorption speed. Furthermore, colloidal particles and their deposition to the substrate are taken into account, which allows to predict resulting deposition patterns as function on the initial mixture composition.