Abstract
The velocity autocorrelation functions of grains moving in highly fluidized three-dimensional granular beds have been determined for the first time. Positron emission particle tracking was used to determine the location of a tracer particle. The velocity auto- and cross-correlation functions were then calculated following estimation of the velocities of the grains. The cross-correlations were found to be about zero for all times and the velocity autocorrelation functions differed in the x and y directions. A numerical study was performed to model the velocity auto-correlation function in the y-direction and this analysis was found to capture many of the observed experimental features. (C) 2002 American Institute of Physics.
| Original language | English |
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| Pages (from-to) | 232-239 |
| Number of pages | 8 |
| Journal | Physics of Fluids |
| Volume | 14(1) |
| Issue number | 1 |
| Publication status | Published - 1 Jan 2002 |