TY - JOUR
T1 - Oscillatory pipe flows of a yield-stress fluid
AU - Park, Yong Sung
AU - Liu, Philip L.F.
N1 - Funding Information:
This work was supported by grants from the National Science Foundation and the Office of Naval Research to Cornell University. P.L.-F.L. would like to acknowledge the support of the Humbolt Foundation through a Research Award during the preparation of the paper. Y.S.P. would also like to acknowledge the support of the Korea Science and Engineering Foundation under grant number M06-2004-000-10541. The authors wish to thank Professor C. Cohen, Professor L. A. Archer and Mr H. Qi for their help in preparation and rheological measurement of the Carbopol
PY - 2010/9
Y1 - 2010/9
N2 - 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.
AB - 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.
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U2 - 10.1017/S0022112010001667
DO - 10.1017/S0022112010001667
M3 - Article
AN - SCOPUS:77957120418
SN - 0022-1120
VL - 658
SP - 211
EP - 228
JO - Journal of Fluid Mechanics
JF - Journal of Fluid Mechanics
ER -