Axial segregation of granular media rotated in a drum mixer: Pattern evolution

Journal Article · Wed Oct 01 04:00:00 EDT 1997 · Physical Review. E, Statistical Physics, Plasmas, Fluids, and Related Interdisciplinary Topics

DOI:https://doi.org/10.1103/PhysRevE.56.4386· OSTI ID:632549

Hill, K M; Kakalios, J ^[1]; Caprihan, A ^[2]

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1. School of Physics and Astronomy, The University of Minnesota, Minneapolis, Minnesota 55255 (United States)
2. The Lovelace Respiratory Research Institute, 2425 Ridgecrest Drive Southeast, Albuquerque, New Mexico 87108 (United States)

In the traditional axial segregation effect, a homogeneous mixture of different types of granular material rotated in a drum mixer segregates into surface bands of relatively pure single concentrations along the axis of rotation. This effect primarily has been studied with respect to the initial segregation. However, the initial pattern is not stable, but evolves in time with continued rotation through metastable states of fewer and fewer bands. We describe two experimental studies of this evolution that provide a more complete picture of the dynamics involved in the pattern progression. The use of a charge coupled device camera in conjunction with digital analysis techniques provides a quantitative measure of the state of the surface as a function of time, while magnetic resonance imaging techniques provide a noninvasive method for studying the segregation beneath the surface. These methods indicate that the underlying mechanisms for the pattern evolution may originate in the bulk of the material, beneath the avalanching surface. {copyright} {ital 1997} {ital The American Physical Society}

• DOE Contract Number: FG03-93ER14316; FG22-94PC94248
• OSTI ID: 632549
• Journal Information: Physical Review. E, Statistical Physics, Plasmas, Fluids, and Related Interdisciplinary Topics, Journal Name: Physical Review. E, Statistical Physics, Plasmas, Fluids, and Related Interdisciplinary Topics Journal Issue: 4 Vol. 56; ISSN PLEEE8; ISSN 1063-651X
• Country of Publication: United States
• Language: English

Related Subjects

66 PHYSICS
GRANULAR MATERIALS
MAGNETIC DRUMS
METASTABLE STATES
MIXERS
MIXING
MIXTURES
ROTATION
SEGREGATION
SURFACES
TIME DEPENDENCE