Regensburg 2010 – wissenschaftliches Programm

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DY: Fachverband Dynamik und Statistische Physik

DY 30: Posters II

DY 30.44: Poster

Donnerstag, 25. März 2010, 16:00–18:00, Poster C

Dynamics of vertically fluidized wet granulates — •Zeina Khan¹, Mario Scheel², Marco Di Michiel², Ralf Seemann^1,3, and Stephan Herminghaus¹ — ¹Max Planck Institute for Dynamics and Self-Organization, Göttingen, Germany — ²European Synchrotron Radiation Facility, Grenoble Cedex, France — ³Experimental Physics, Saarland University, Saarbrücken, Germany

When dry granulates are shaken vertically and the peak acceleration exceeds the force of gravity, the grains move irregularly like the molecular motion of a fluid while they remain densely packed. It has been shown that when a fluid is added to the granulate, the critical acceleration at which fluidization occurs increases acutely when compared with the dry case; the material becomes stiffer [1]. Using fast synchrotron X-ray bulk imaging techniques we track the motion of tracer particles embedded in the granular flow and report on the effects of varying the vibration amplitude and wetting content on the resulting velocity statistics and caging dynamics. We also present results from a novel x-ray imaging technique used to determine the three-dimensional motion of tracer particles in a fluidized granulate.

[1]: M. Scheel et al., Nature Materials 7, 189 (2008) .