Issue
EPL
Volume 80, Number 6, December 2007
Article Number 60004
Number of page(s) 6
Section General
DOI http://dx.doi.org/10.1209/0295-5075/80/60004
Published online 07 November 2007
EPL, 80 (2007) 60004
DOI: 10.1209/0295-5075/80/60004

An adhesive DPD wall model for dynamic wetting

B. Henrich1, 2, C. Cupelli3, M. Moseler2, 1 and M. Santer2, 3

1  FMF-Freiburg Materials Research Center, University of Freiburg - Stefan-Meier-Straße 21, D-79104 Freiburg, Germany
2  IWM-Fraunhofer Institute for the Mechanics of Materials - Wöhlerstraße 11, D-79108 Freiburg, Germany
3  IMTEK-Institute for Microsystem Technology, Laboratory for MEMS applications - Georges-Köhler-Allee 106, D-79110 Freiburg, Germany


received 20 August 2007; accepted in final form 16 October 2007; published December 2007
published online 7 November 2007

Abstract
A novel method for the treatment of solid-liquid interfaces in the framework of dissipative particle dynamics (DPD) is presented. The solid is represented by an amorphous, thermally rough ensemble of particles. Since the density of this phase is chosen commensurate to the liquid, artefacts of alternative wall models such as particle layering or spurious variations in temperature are avoided. An adjustable static contact angle permits the convenient study of complex wetting phenomena. We explore the physical behaviour of this boundary model with respect to bulk Poiseuille and Couette flow as well as forced wetting and the behaviour of dynamic contact angles.

PACS
02.70.Ns - Molecular dynamics and particle methods.
68.08.-p - Liquid-solid interfaces.
68.03.-g - Gas-liquid and vacuum-liquid interfaces.

© Europhysics Letters Association 2007