Rd. Wildman et al., Granular temperature profiles in three-dimensional vibrofluidized granularbeds - art. no. 061311, PHYS REV E, 6306(6), 2001, pp. 1311
The motion of grains in a three-dimensional vibrofluidized granular bed has
been measured using the technique of positron emission particle tracking,
to provide three-dimensional packing fraction and granular temperature dist
ributions. The mean square fluctuation velocity about the mean was calculat
ed through analysis of the short time mean squared displacement behavior, a
llowing measurement of the granular temperature at packing fractions of up
to eta similar to 0.15. The scaling relationship between the granular tempe
rature, the number of layers of grains, and the base velocity was determine
d. Deviations between the observed scaling exponents and those predicted by
recent theories are attributed to the influence of dissipative grain-sidew
all collisions.