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Particle-phase distributions of pressure-driven flows of bidisperse suspensions

Published online by Cambridge University Press:  14 December 2007

JAY T. NORMAN ,
BABATUNDE O. OGUNTADE  and
ROGER T. BONNECAZE
JAY T. NORMAN
Affiliation:
Department of Chemical Engineering, The University of Texas at Austin, Austin, TX 78712, USA
BABATUNDE O. OGUNTADE
Affiliation:
Department of Chemical Engineering, The University of Texas at Austin, Austin, TX 78712, USA
ROGER T. BONNECAZE
Affiliation:
Department of Chemical Engineering, The University of Texas at Austin, Austin, TX 78712, USA
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Abstract

The phase distribution of a bimodal distribution of negatively buoyant particles in a low-Reynolds-number pressure-driven flow of a suspension in a horizontal pipe is measured using multi-frequency electrical impedance tomography (EIT). Suspensions of heavy silver-coated particles and slightly heavy PMMA particles exhibit different effective conductivities depending on the frequency of an applied electrical current. This difference allows the separate imaging of the phase distribution of each particle type and the composite suspension. At low flow rates the dense particles tend to distribute in the lower half of the pipe The particles are resuspended toward the centre as the flow rate is increased. The slightly heavy particles tend to accumulate closer to the centre of the pipe. The presence of the nearly neutrally buoyant particles enhances the resuspension of the heavy particles compared to that of a suspension of heavy particles alone at the same volume fraction. A suspension balance model is used to theoretically predict the distribution of particles in the flow assuming an ideal mixing rule for the particle partial pressures. The agreement between the predictions and the experimental observations is qualitatively correct and quantitatively fair.

Type
Papers
Information
Journal of Fluid Mechanics , Volume 594 , 10 January 2008 , pp. 1 - 28
Copyright
Copyright © Cambridge University Press 2008

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