Dresden 2009 – wissenschaftliches Programm
DY 12.15: Poster
Dienstag, 24. März 2009, 14:30–16:30, P1A
Flight paths of vertically fluidized wet granulates — •Zeina Khan1, Mario Scheel1, Marco Di Michiel2, Ralf Seemann1,3, and Stephan 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 increases acutely when compared with the dry case , however it is not yet known which flow patterns evolve in this three dimensional system . Using fast synchrotron X-ray imaging techniques we track the motion of tracer particles embedded in the bulk of the granulate flow. We report on the effects of varying the vibration amplitude and frequency on the resulting flow pattern and velocity statistics. 1. M. Scheel et al., J. Phys.: Cond Mat. 16, S4213 (2004).