NDLI: Experimental study of density segregation at end walls in a horizontal rotating cylinder saturated with fluid: friction to lubrication transition

Content Provider	Springer Nature Link
Author	Ahmed, Shakil John, Sam E. Šutalo, Ilija D. Metcalfe, Guy Liffman, Kurt
Copyright Year	2012
Abstract	What is the effect of interstitial fluid viscosity on granular density segregation in a horizontal rotating cylinder? We conducted experiments in the rolling regime with equal amounts of equal sized high and low density, nearly spherical granular particles saturated with air, water, and water-glycerin mixtures. We held particle density, rotation rate and characteristic length scale constant to highlight differences due purely to the interstitial fluid. Images of the granular flow at an end wall were used to determine radial and axial density segregation rates and patterns. Over a four decade change in viscosity, segregation rates varied by only a factor of two. However, for ratios of lubrication to frictional stresses above one, segregation rates decreased by about 30%, and we observed several notable phenomena in the segregation pattern formation. These were a creeping mode of radial density segregation, a change in shape of the granular bed to kidney shaped from flat, and for cylinders more than half full the typically reported unsheared central portion of the granular bed (often referred to in the literature as a core region) was disrupted by a wavy instability where the rate of disappearance of the core region decreased as the fill level increased.
Starting Page	319
Ending Page	332
Page Count	14
File Format	PDF
ISSN	14345021
Journal	Granular Matter
Volume Number	14
Issue Number	3
e-ISSN	14347636
Language	English
Publisher	Springer-Verlag
Publisher Date	2012-03-04
Publisher Place	Berlin, Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Density segregation Viscosity Saturation Lubrication Friction Core instability Creeping segregation End walls Soft and Granular Matter, Complex Fluids and Microfluidics Engineering Thermodynamics, Heat and Mass Transfer Industrial Chemistry/Chemical Engineering Materials Science Engineering Fluid Dynamics Geoengineering, Foundations, Hydraulics
Content Type	Text
Resource Type	Article
Subject	Physics and Astronomy Mechanics of Materials Materials Science

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