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Title: Couette flows of a granular monolayer: An experimental study

Abstract

An experimental study concerning rapid flows of granular materials in a two dimensional planar granular Couette flow apparatus is performed. The device is capable of generating particulate flows in grain-inertia regime at different shearing rates and solid volume fractions. Multi-color spherical glass particles are sheared across an annular test-section for several wall angular velocities. A video recorder is used to record the motion of particles, and consecutive images are stored and analyzed by an image processing technique for evaluating individual grain velocities. Experimental data for the mean velocity, the root mean-square fluctuation velocity components and the solid volume fraction profile are obtained. The resulting mean velocity profiles have a roughly linear variation for the range of solid volume fractions and shear rates studied. The solid volume fraction profiles exhibit nonuniform variations with the highest concentration occuring near the center of the shearing cell. The RMS-fluctuation velocities are roughly constant, with the streamwise fluctuation being somewhat larger than the cross-stream direction. The experimentally measured flow properties are in reasonable agreement with the earlier theoretical and simulation results.

Authors:
; ;
Publication Date:
Research Org.:
Clarkson Univ., Potsdam, NY (United States). Dept. of Mechanical and Aeronautical Engineering
Sponsoring Org.:
USDOE, Washington, DC (United States)
OSTI Identifier:
78828
Report Number(s):
MAE-304
ON: DE95015963
DOE Contract Number:  
FG22-91PC91297; FG22-94PC94213
Resource Type:
Technical Report
Resource Relation:
Other Information: PBD: Mar 1995
Country of Publication:
United States
Language:
English
Subject:
01 COAL, LIGNITE, AND PEAT; 42 ENGINEERING NOT INCLUDED IN OTHER CATEGORIES; GRANULAR MATERIALS; SOLIDS FLOW; GLASS; SHEAR; VELOCITY; EXPERIMENTAL DATA; FUEL SLURRIES; FLUIDIZED-BED COMBUSTION

Citation Formats

Elliott, K E, Ahmadi, G, and Kvasnak, W. Couette flows of a granular monolayer: An experimental study. United States: N. p., 1995. Web. doi:10.2172/78828.
Elliott, K E, Ahmadi, G, & Kvasnak, W. Couette flows of a granular monolayer: An experimental study. United States. https://doi.org/10.2172/78828
Elliott, K E, Ahmadi, G, and Kvasnak, W. Wed . "Couette flows of a granular monolayer: An experimental study". United States. https://doi.org/10.2172/78828. https://www.osti.gov/servlets/purl/78828.
@article{osti_78828,
title = {Couette flows of a granular monolayer: An experimental study},
author = {Elliott, K E and Ahmadi, G and Kvasnak, W},
abstractNote = {An experimental study concerning rapid flows of granular materials in a two dimensional planar granular Couette flow apparatus is performed. The device is capable of generating particulate flows in grain-inertia regime at different shearing rates and solid volume fractions. Multi-color spherical glass particles are sheared across an annular test-section for several wall angular velocities. A video recorder is used to record the motion of particles, and consecutive images are stored and analyzed by an image processing technique for evaluating individual grain velocities. Experimental data for the mean velocity, the root mean-square fluctuation velocity components and the solid volume fraction profile are obtained. The resulting mean velocity profiles have a roughly linear variation for the range of solid volume fractions and shear rates studied. The solid volume fraction profiles exhibit nonuniform variations with the highest concentration occuring near the center of the shearing cell. The RMS-fluctuation velocities are roughly constant, with the streamwise fluctuation being somewhat larger than the cross-stream direction. The experimentally measured flow properties are in reasonable agreement with the earlier theoretical and simulation results.},
doi = {10.2172/78828},
url = {https://www.osti.gov/biblio/78828}, journal = {},
number = ,
volume = ,
place = {United States},
year = {1995},
month = {3}
}