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Title: Simulation study of particle clouds in oscillating shear flow

Abstract

Simulations of cylindrical clouds of concentrated, neutrally buoyant, suspended particles are used to investigate the dispersion of the particles in an oscillating Couette flow. In experiments by Metzger & Butler (Phys. Fluids, vol. 24 (2), 2012, 021703) with spherical clouds of non-Brownian particles, the clouds are shown to elongate at volume fraction$$\unicode[STIX]{x1D719}=0.4$$but form ‘galaxies’ where the cloud rotates as a single body with extended arms when$$\unicode[STIX]{x1D719}>0.4$$and the ratio of the cloud radius to particle radius,$R/a$$, is sufficiently large. The simulations, which use the force coupling method, are completed for$$\unicode[STIX]{x1D719}=0.4$$and$$\unicode[STIX]{x1D719}=0.55$$, with$$R/a$$between$$5$$and$$20$$. The cloud shape for$$\unicode[STIX]{x1D719}=0.4$$is shown to be reversible at low strain amplitude, and extend in the streamwise direction along the centre of the cloud at moderate strain amplitude. For higher strain amplitude the clouds extend near the channel walls to form a parallelogram. The results demonstrate that the particle contact force determines the transition between these states and plays a large role in the irreversibility of the parallelograms. Rotating galaxies form at$$\unicode[STIX]{x1D719}=0.55$$with$$R/a\geqslant 15$, and are characterized by a particle-induced flow in the wall-normal direction.

Authors:
ORCiD logo; ORCiD logo
Publication Date:
Research Org.:
Brown Univ., Providence, RI (United States)
Sponsoring Org.:
USDOE Office of Science (SC)
OSTI Identifier:
1538916
DOE Contract Number:  
SC0009247
Resource Type:
Journal Article
Journal Name:
Journal of Fluid Mechanics
Additional Journal Information:
Journal Volume: 852; Journal ID: ISSN 0022-1120
Publisher:
Cambridge University Press
Country of Publication:
United States
Language:
English
Subject:
Mechanics; Physics

Citation Formats

Howard, Amanda A., and Maxey, Martin R. Simulation study of particle clouds in oscillating shear flow. United States: N. p., 2018. Web. doi:10.1017/jfm.2018.534.
Howard, Amanda A., & Maxey, Martin R. Simulation study of particle clouds in oscillating shear flow. United States. doi:10.1017/jfm.2018.534.
Howard, Amanda A., and Maxey, Martin R. Tue . "Simulation study of particle clouds in oscillating shear flow". United States. doi:10.1017/jfm.2018.534.
@article{osti_1538916,
title = {Simulation study of particle clouds in oscillating shear flow},
author = {Howard, Amanda A. and Maxey, Martin R.},
abstractNote = {Simulations of cylindrical clouds of concentrated, neutrally buoyant, suspended particles are used to investigate the dispersion of the particles in an oscillating Couette flow. In experiments by Metzger & Butler (Phys. Fluids, vol. 24 (2), 2012, 021703) with spherical clouds of non-Brownian particles, the clouds are shown to elongate at volume fraction$\unicode[STIX]{x1D719}=0.4$but form ‘galaxies’ where the cloud rotates as a single body with extended arms when$\unicode[STIX]{x1D719}>0.4$and the ratio of the cloud radius to particle radius,$R/a$, is sufficiently large. The simulations, which use the force coupling method, are completed for$\unicode[STIX]{x1D719}=0.4$and$\unicode[STIX]{x1D719}=0.55$, with$R/a$between$5$and$20$. The cloud shape for$\unicode[STIX]{x1D719}=0.4$is shown to be reversible at low strain amplitude, and extend in the streamwise direction along the centre of the cloud at moderate strain amplitude. For higher strain amplitude the clouds extend near the channel walls to form a parallelogram. The results demonstrate that the particle contact force determines the transition between these states and plays a large role in the irreversibility of the parallelograms. Rotating galaxies form at$\unicode[STIX]{x1D719}=0.55$with$R/a\geqslant 15$, and are characterized by a particle-induced flow in the wall-normal direction.},
doi = {10.1017/jfm.2018.534},
journal = {Journal of Fluid Mechanics},
issn = {0022-1120},
number = ,
volume = 852,
place = {United States},
year = {2018},
month = {8}
}

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