Measuring Diffusion of Particles in the Flowing Layer of the Rotating Drum Using MRI
A formalism was derived to obtain spatial distributions of collisional correlation times for macroscopic
particles undergoing granular flow from pulsed gradient spin echo nuclear magnetic resonance diffusion
data. This was then applied to axial motion in the shear flow regime of a 3D granular
flow in a horizontal rotating cylinder at one rotation rate. It was shown that spatial distributions of
random and nonrandom motions can be in a specific time frame leading to the estimation of the correlation time and the
velocity fluctuation intensity near the free surface.

REFERENCES:
Seymour, J.D., Caprihan, A., Altobelli, S.A., Fukushima, E.
Pulsed Gradient Spin Echo Nuclear Magnetic Resonance Imaging of Diffusion in Granular Flow
(2000) Physical Review Letters, 84 (2), pp. 266269.
Caprihan, A., Seymour, J.D.
Correlation Time and Diffusion Coefficient Imaging: Application to a Granular Flow System
(2000) Journal of Magnetic Resonance, 144 (1), pp. 96107.
Last Updated: 11:21 AM 5/15/2008