Phys. Rev. Lett. 88, 064301 (2002) [4 pages]Coexistence of Two Granular Temperatures in Binary Vibrofluidized BedsReceived 24 May 2001; revised 28 November 2001; published 25 January 2002 An investigation into the granular temperature distributions of a binary vibrofluidized granular bed has been conducted using positron emission particle tracking. By repeating each experiment with the tracer selected in turn from the two size components, the granular temperature and packing fraction distributions for each phase were determined. It was found that, for a range of size fractions, the granular temperature of the larger particles was higher than that of the smaller diameter grains, a result which was supported by a simple theoretical analysis based on the steady state energy equation. © 2002 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevLett.88.064301
DOI:
10.1103/PhysRevLett.88.064301
PACS:
45.70.Mg, 47.20.Bp, 51.10.+y
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