An adhesive DPD wall model for dynamic wettingB. 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
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.
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