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TECHNICAL PAPERS

Particle Image Velocimetry Evaluation of a Novel Oscillatory-Flow Flexible Chamber Mixer

[+] Author and Article Information
Thomas N. Shipman

Department of Mechanical Engineering, University of Delaware, Newark, DE 19711

Ajay K. Prasad1

Department of Mechanical Engineering, University of Delaware, Newark, DE 19711prasad@udel.edu

Scott L. Davidson

 ILC Dover Inc., One Moonwalker Road, Frederica, DE 19946

Donald R. Cohee

 ILC Dover Inc., One Moonwalker Road, Frederica, DE 19946coheed@ilcdover.com

1

Corresponding author.

J. Fluids Eng 129(2), 179-187 (Jul 10, 2006) (9 pages) doi:10.1115/1.2409347 History: Received October 11, 2005; Revised July 10, 2006

This paper describes a novel oscillatory-flow mixer consisting of a pair of flexible chambers connected by a perforated plate, or septum. During operation, the septum undergoes reciprocating motion such that the two chambers are alternately compressed and expanded. During compression, fluid is forced from one chamber to the other through the septum holes, creating an array of jets that drive the mixing process. Flow characterization within the mixer was conducted using particle image velocimetry. Tests were performed for Reynolds numbers ranging from 4 to 23,000, which encompass the creeping, laminar, and turbulent flow regimes. Results include mean and rms velocity maps, shear rate maps, vertical velocity profiles, and flow development data. The results suggest that the mixer is capable of gentle, continuous stirring (important for biological applications), as well as vigorous agitation. Finally, a comparison between this mixer and other existing mixing technologies is presented.

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Copyright © 2007 by American Society of Mechanical Engineers
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Figures

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Figure 5

Velocity magnitude, streamlines, rms velocity, vertical velocity profiles, and shear rate for Re=76

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Figure 6

Velocity magnitude, streamlines, rms velocity, vertical velocity profiles, and shear rate for Re=23,000

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Figure 1

Artistic rendering of mixer assembly

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Figure 2

Schematic of mixing apparatus

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Figure 3

Schematic of septum plate

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Figure 4

Velocity magnitude, streamlines, rms velocity, vertical velocity profiles, and shear rate for Re=4

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