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Physics of Fluids / Volume 24 / Issue 2 / LETTERS

Phys. Fluids 24, 021703 (2012); http://dx.doi.org/10.1063/1.3685537 (6 pages)

Clouds of particles in a periodic shear flow

Bloen Metzger1 and Jason E. Butler2

1IUSTI-CNRS UMR 6595, Polytech Marseille, 13453 Marseille Cedex 13, France
2Department of Chemical Engineering, University of Florida, Gainesville, Florida 32611, USA

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(Received 25 October 2011; accepted 3 January 2012; published online 14 February 2012)

We have investigated the time evolution of a cloud of non-Brownian particles subjected to a periodic shear flow in an otherwise pure liquid at low Reynolds number. This experiment illustrates the irreversible nature of particulate systems submitted to a shear. When repeating the cycles of shear, we have found that clouds of particles progressively disperse in the flow direction until reaching a threshold critical volume fraction that depends upon the strain amplitude; this critical volume fraction coincides with measurements of the threshold for reversibility found from experiments on homogeneous suspensions in periodic shear. Two distinct patterns, including a “galaxy-like” shape, are observed for the evolution of the clouds and the transition between the patterns is identified using a simple scaling analysis. Movies are available with the online version of the paper.

© 2012 American Institute of Physics

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KEYWORDS and PACS

Keywords

pattern formation, pulsatile flow, shear flow, suspensions, two-phase flow

PACS

ARTICLE DATA

Digital Object Identifier
http://dx.doi.org/10.1063/1.3685537

PUBLICATION DATA

ISSN

1070-6631 (print)  
1089-7666 (online)

Publisher

$abstract.society.value is a Member of CrossRef American Institute of Physics

For access to fully linked references, you need to log in.
    P. R. Nott, É. Guazzelli, and O. Pouliquen, “The suspension balance model revisited,” Phys. Fluids 23, 043304 (2011)PHFLE6000023000004043304000001.

    I. E. Zarraga and D. T. Leighton, “Normal stress and diffusion in a dilute suspension of hard spheres undergoing simple shear,” Phys. Fluids 13, 565 (2001)PHFLE6000013000003000565000001.

    M. L. Ekiel-Jezewska, B. Metzger, and É. Guazzelli, “Spherical cloud of point particles falling in a viscous fluid,” Phys. Fluids 18, 038104 (2006)PHFLE6000018000003038104000001.

    L. Corté, S. J. Gerbode, W. Man, and D. J. Pine, “Self-organized criticality in sheared suspensions,” Phys. Rev. Lett. 103, 248301 (2009).


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