Berlin 2008 – wissenschaftliches Programm

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DY: Fachverband Dynamik und Statistische Physik

DY 29: Poster II

DY 29.55: Poster

Donnerstag, 28. Februar 2008, 16:00–18:00, Poster C

Flight paths of vertically fluidized wet granulates — •Z. S. Khan¹, M. Scheel¹, M. Di Michiel², R. Seemann^1,3, and S. Herminghaus¹ — ¹MPI for Dynamics and Self-Organization, Bunsenstr. 10, D-37073 Goettingen — ²European Synchrotron Radiation Facility, BP 220 F-38043 Grenoble Cedex — ³Experimental Physics, Saarland University, D-66041 Saarbruecken

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 increased strongly when compared to the dry case [1], however it is not yet known which flow patterns evolve in this three dimensional system. Using fast synchrotron X-ray tomography techniques we track the motion of tracer particles embedded in the bulk of the granulate flow. We report on the effects of varying the frequency and amplitude of vibration as well as the liquid content on the granulate motion.

1. M. Scheel et al., J. Phys.: Cond Mat. 16, S4213 (2004).