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Oscillatory pipe flows of a yield-stress fluid

Published online by Cambridge University Press:  10 June 2010

YONG SUNG PARK  and
PHILIP L.-F. LIU
YONG SUNG PARK*
Affiliation:
School of Civil and Environmental Engineering, Cornell University, Ithaca, NY 14853, USA
PHILIP L.-F. LIU
Affiliation:
School of Civil and Environmental Engineering, Cornell University, Ithaca, NY 14853, USA Institute of Hydrological and Oceanic Sciences, National Central University, Jhongli, Taoyuan 320, Taiwan
*
†Email address for correspondence: yp54@cornell.edu
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Abstract

Oscillatory pipe flows of aqueous Carbopol solutions are investigated both experimentally and analytically. Using the PIV technique, the velocity profiles are measured and compared with the numerical solutions based on an elasto-viscoplastic rheological model, in which an elastic spring is serially connected to a regularized Bingham viscoplastic model. The rheological parameters, such as shear modulus of elasticity, yield stress and viscosity, are estimated from steady-shear measurements. Good agreement between the experiments and the model results is observed. It is apparent that the elasticity plays an important role in the unsteady flows of the soft yield-stress fluid studied herein.

JFM classification

Geophysical and Geological Flows: Coastal engineering Non-Newtonian Flows: Plastic materials Non-Newtonian Flows: Viscoelasticity
Type
Papers
Information
Journal of Fluid Mechanics , Volume 658 , 10 September 2010 , pp. 211 - 228
Copyright
Copyright © Cambridge University Press 2010

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References

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