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Nuclear Magnetic Resonance Studies of Granular Flows – Current Status

Published online by Cambridge University Press:  01 February 2011

Stephen A. Altobelli ,
Arvind Caprihan ,
Eiichi Fukushima  and
Joseph D. Seymour
Stephen A. Altobelli
Affiliation:
New Mexico Resonance, Albuquerque, NM 87108, U.S.A.
Arvind Caprihan
Affiliation:
New Mexico Resonance, Albuquerque, NM 87108, U.S.A.
Eiichi Fukushima
Affiliation:
New Mexico Resonance, Albuquerque, NM 87108, U.S.A.
Joseph D. Seymour
Affiliation:
New Mexico Resonance, Albuquerque, NM 87108, U.S.A.
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Abstract

Nuclear magnetic resonance (NMR) is a non-intrusive method that can characterize not only the particulate density but also velocity and velocity fluctuation parameters. A survey of all the known NMR measurements of granular flow will be followed by a brief description of NMR as it applies to granular flow. Two new experiments, both involving flows in partially filled rotating horizontal cylinders, will be described. First, the effect of a stationary blade to suppress the azimuthal velocity of particles being brought up and deposited into the flowing layer on flow-velocity profiles will be studied. Suppressing the azimuthal velocity reduces the deviation of the velocity profile from a quadratic dependence on the height above the rigid layer. Second, a new NMR scheme will be presented that yields spatial distributions of collisional correlation times for macroscopic particles undergoing granular flow. It is based on Pulsed-Gradient Spin-Echo strategy that is commonly used to measure molecular diffusion in liquids. The scheme will be demonstrated with an example from shear flow in a partially-filled horizontal cylinder. Spatially resolved collisional correlation times and velocity fluctuation intensities are derived from the measurements and have values of ∼1 ms and ∼10-3 m2/s2 respectively, at the center of the free surface for 2 mm particles in a 70 mm diameter cylinder rotating at 2.36 rad/s.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 627: Symposium BB – The Granular State , 2000 , BB2.1
Copyright
Copyright © Materials Research Society 2000

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References

REFERENCES AND BIBLIOGRAPHY

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