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Particle Migration Rates in a Couette Apparatus

Published online by Cambridge University Press:  05 May 2011

S.-C. Hsiao ,
D. Christensen ,
M.S. Ingber ,
L.A. Mondy  and
S.A. Altobelli
S.-C. Hsiao*
Affiliation:
Department of Hydraulic and Ocean Engineering, National Cheng-Kung University, Tainan, Taiwan 70101, R.O.C.
D. Christensen*
Affiliation:
Department of Mechanical Engineering, University of New Mexico, U.S.A.
M.S. Ingber*
Affiliation:
Department of Mechanical Engineering, University of New Mexico, U.S.A.
L.A. Mondy*
Affiliation:
Energetic and Multiphase Processes Department, Sandia National Laboratories, Albuquerque, NM, U.S.A.
S.A. Altobelli*
Affiliation:
New Mexico Resonance, Albuquerque, NM, U.S.A.
*
*Postdoctoral Fellow
**Graduate student
***Professor
****Senior Researcher
****Senior Researcher
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Abstract

Bulk migration of particles towards regions of lower shear occurs in suspensions of neutrally buoyant spheres in Newtonian fluids undergoing creeping flow in the annular region between two rotating, coaxial cylinders (a wide-gap Couette). For a monomodal suspension of spheres in a viscous fluid, dimensional analysis indicates that the rate of migration at a given concentration should scale with the square of the sphere radius. However, a previous experimental study [12] showed that the rate of migration of spherical particles at 50% volume concentration actually scaled with the sphere radius to approximately the 2.9 power. In the current study, a series of experiments is performed to extend the previous study to two new concentrations, namely, 35% and 42.5%. The new study indicates that the power scaling decreases with concentration.

Keywords

Couette apparatusParticle migration rateNMR image
Type
Articles
Information
Journal of Mechanics , Volume 21 , Issue 2 , June 2005 , pp. 71 - 75
Copyright
Copyright © The Society of Theoretical and Applied Mechanics, R.O.C. 2005

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References

REFERENCES

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