Dresden 2009 – wissenschaftliches Programm

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DY: Fachverband Dynamik und Statistische Physik

DY 12: Poster I

DY 12.4: Poster

Dienstag, 24. März 2009, 14:30–16:30, P1A

Two dimensional wet granular matter under shear — •Kai Huang, Martin Brinkmann, Jayati Sarkar, and Stephan Herminghaus — Max Planck Institute for Dynamics and Self-organization, Bunsenstr.10, 37073 Göttingen, Germany

The two dimensional clustering of wet particles under shear flow is studied experimentally and the results are compared with both molecular dynamic (MD) and Lattice Bolzmann (LB) simulations. Particles floating on a viscous liquid are wetted by an oil film, which gives rise to a hysteretic and short ranged capillary force between adjacent particles. This attractive force dominates other particle-particle interactions. Shear induced clustering of particles is captured by a high speed camera and motions of individual particles are determined by an image processing procedure. The size distribution and fractal dimensions of clusters obtained by experiments show good agreement with MD simulation. Comparison to LB simulation indicates that hydrodynamic interaction does not play an important role. The average cluster size is shown to vary as ∝γα with α ≈ −2/3, where γ is the applied shear rate. Our results can be well explained on the basis of a simple capillary model.

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