Phys. Rev. Lett. 93, 258001 (2004) [4 pages]Droplets of Fine Powders Running Uphill by Vertical VibrationReceived 23 April 2004; published 13 December 2004 We observe “droplets” forming when an inclined surface initially covered by fine powders is vibrated vertically. Droplets move uphill in the direction of maximum local slope. The speed of droplets is nearly independent on their size whereas it is an increasing function of the plate acceleration and inclination. By evacuating the container we show that the interstitial air flow plays an important role on droplets forming and their drift. © 2004 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevLett.93.258001
DOI:
10.1103/PhysRevLett.93.258001
PACS:
45.70.Mg, 45.70.Qj, 67.70.+n
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