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DY: Fachverband Dynamik und Statistische Physik

DY 35: Complex Fluids and Soft Matter - Part I (joint session DY/ CPP / BP)

DY 35.7: Vortrag

Mittwoch, 18. März 2015, 16:30–16:45, BH-N 333

Modeling drying droplets on porous substrates — •Christian Diddens¹, Hans Kuerten¹, Cees van der Geld¹, and Herman Wijshoff^1,2 — ¹Eindhoven University of Technology, The Netherlands — ²Océ Technologies B.V., Venlo, The Netherlands

We investigate the drying of an inkjet-printed picoliter droplet on a porous substrate in the framework of a numerical model. The evolution of the droplet is governed by evaporation at the liquid-air interface and absorption of the liquid into the porous substrate.

When a binary mixture is considered, an interplay of preferential evaporation, composition-dependent viscosity and the absorption dynamics can interestingly result in a slower drying for faster evaporation rates.

Since solute particles and their deposition to the surface are also taken into account, the present model can be utilized as predictive tool for deposition patterns in ink-jet printing processes.