This study examines the impact of dilute polymer solutions on the unique isolated secondary flows between concentric, rotating cylinders, namely Taylor-Couette (TC) flow. We mapped the stability of flow states using Newtonian and dilute polyethylene oxide (PEO) solutions over the Reynolds number range of − 100 < Reo < 500 and 0 < Rei < O(103), where subscripts ‘o’ and ‘i’ refer to outer and inner cylinders, respectively. Elasticity number (El) of the PEO fluids, defined as the ratio of elastic to inertial forces, ranges from O(10− 4) to O(10− 2). This work expands on previous studies by (a) significantly expanding the range of Rei, Reo, and El examined, (b) use of a consistent, conservative protocol for reaching flow states, and (c) rheological characterization of the solutions via shear and capillary breakup extensional rheometry. Using spectral analysis of flow visualization of the r-z or z-θ planes, we find the effect of El on the critical conditions for laminar and chaotic axisymmetric and nonaxisymmetric flow states is nonmonotonic and mode-dependent, with greater modification of higher order transitions involving small-scale features. While the critical conditions are modified by low El for all transitions, the flow states vary from those for Newtonian fluids at higher Rei and for the more elastic fluids.
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November 2011
Research Article|
November 01 2011
Effects of weak elasticity on the stability of high Reynolds number co- and counter-rotating Taylor-Couette flows
Cari S. Dutcher;
Cari S. Dutcher
Department of Chemical Engineering,
University of California at Berkeley
, Berkeley, California 94720
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Susan J. Muller
Susan J. Muller
a)
Department of Chemical Engineering,
University of California at Berkeley
, Berkeley, California 94720
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a)
Author to whom correspondence should be addressed; electronic mail: muller2@berkeley.edu
J. Rheol. 55, 1271–1295 (2011)
Article history
Received:
April 11 2011
Accepted:
July 18 2011
Citation
Cari S. Dutcher, Susan J. Muller; Effects of weak elasticity on the stability of high Reynolds number co- and counter-rotating Taylor-Couette flows. J. Rheol. 1 November 2011; 55 (6): 1271–1295. https://doi.org/10.1122/1.3626584
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