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Title: Velocity fluctuations of fracturelike disruptions of associating polymer solutions
Author: Ignés i Mullol, Jordi
Zhao, H.
Maher, J. V.
Keywords: Dinàmica de fluids
Mecànica dels medis continus
Fluid dynamics
Continuum mechanics
Issue Date: 1995
Publisher: The American Physical Society
Abstract: Velocity has been measured as a function of time for propagating crack tips as water is injected into solutions of end-capped associating polymers in a rectanguar Hele-Shaw cell. Measurements were performed for flows with different values of cell gap, channel width, polymer molecular weight, and polymer concentration. The condition for the onset of fracturelike behavior is well described by a Deborah number which uses the shear-thinning shear rate of the polymer solution as a characteristic frequency for network relaxation. At low molecular weight, the onset of fracturelike pattern evolution is accompanied by an abrupt jump in tip velocity, followed by a lower and approximately constant acceleration. At high molecular weight, the transition to fracturelike behavior involves passing through a regime that may be understood in terms of stick-slip dynamics. The crack-tip wanders from side to side and fluctuates (in both speed and velocity along the channel) with a characteristic frequency which depends linearly on the invading fluid injection rate.
Note: Reproducció del document publicat a:
It is part of: Physical Review E, 1995, vol. 51, núm. 2, p. 1338-1343
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ISSN: 1063-651X
Appears in Collections:Articles publicats en revistes (Ciència dels Materials i Química Física)

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