Berlin 2015 – scientific programme
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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: Talk
Wednesday, March 18, 2015, 16:30–16:45, BH-N 333
Modeling drying droplets on porous substrates — •Christian Diddens1, Hans Kuerten1, Cees van der Geld1, and Herman Wijshoff1,2 — 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.