Wednesday, April 3, 2013

1304.0569 (Carsten Güttler et al.)

Granular convection and the Brazil nut effect in reduced gravity    [PDF]

Carsten Güttler, Ingo von Borstel, Rainer Schräpler, Jürgen Blum
We present laboratory experiments of a vertically vibrated granular medium consisting of 1 mm diameter glass beads with embedded 8 mm diameter intruder glass beads. The experiments were performed in the laboratory as well as in a parabolic flight under reduced-gravity conditions (on Martian and Lunar gravity levels). We measured the mean rise velocity of the large glass beads and present its dependence on the fill height of the sample containers, the excitation acceleration, and the ambient gravity level. We find that the rise velocity scales in the same manner for all three gravity regimes and roughly linearly with gravity.
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