✦ LIBER ✦

Stability of rotational couette flow of polymer solutions

✍ Scribed by Zu-Shung Sun; Morton M. Denn

Publisher: American Institute of Chemical Engineers
Year: 1972
Tongue: English
Weight: 610 KB
Volume: 18
Category: Article
ISSN: 0001-1541
DOI: 10.1002/aic.690180519

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✦ Synopsis

Abstract

The onset of secondary flow between rotating cylinders (Taylor vortices) was observed for a dilute polymer solution whose viscometric flow properties were characterized rheogoniometrically. The critical Taylor number (flow onset) was predicted accurately by linear stability theory with a stress constitutive equation describing viscometric behavior. The cell spacing differed significantly from that predicted by linear theory. A nonlinear analysis shows that Linear theory will predict the ultimate cell size only for an inelastic liquid. For an elastic liquid a larger wave number (closer spacing) is a lower energy configuration than the linear theory spacing. This is consistent with experiment.

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