Dresden 2006 – wissenschaftliches Programm
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CPP: Chemische Physik und Polymerphysik
CPP 22: SYMPOSIUM Microfluidics II: Soft objects in flow, open geometries
CPP 22.7: Vortrag
Donnerstag, 30. März 2006, 16:15–16:30, ZEU 160
Dissipative Particle Dynamics as a simulation tool for confined nanofluidic systems. — •Björn Henrich1,2, Claudio Cupelli3, Michael Moseler2,1, and Mark Santer3 — 1University of Freiburg-FMF,Freiburg Materials Research Center, D-79104 Freiburg, Germany — 2IWM, Fraunhofer Institute for Mechanics of Materials, Wöhlerstraße 11, D-79108 Freiburg, Germany — 3University of Freiburg-IMTEK, Department of Microsystem Engineering, Georges-Köhler-Allee 106, D-79110 Freiburg, Germany
Fluid particle methods such as Dissipative Particle Dynamics are continuum simulation approaches to represent fluids, suspensions or polymers on mesoscopic time and length scales. We report how this simulation technique may be applied to study nano scale (> 1nm and < 100nm) impregnation and imbibition phenomena. Pursuing the approach of Warren [1] to account for cohesive properties, we show how adequate solid-liquid interfaces based on "live" walls can be constructed to allow for a variable static contact angle, at the same time avoiding artefacts such as temperature or density oscillations that often occur when rigid walls are used. This model is then utilized to study the impregnation dynamics into a nano slit pore that is filled out of a finite reservoir. We find that the dynamic apparent contact angle within the pore can be determined reliably, and with respect to the capillary number, differs significantly from the one extracted from numerical plug flow experiments.
[1] Phys. Rev. E, 066702 (2003)