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On the stability of circular Couette flow with radial heating

Published online by Cambridge University Press:  26 April 2006

Mohamed Ali  and
P. D. Weidman
Mohamed Ali
Affiliation:
Department of Mechanical Engineering, University of Colorado, Boulder, CO 80309, USA Permanent address: Helwan University, Faculty of Engineering Technology, El-Mattaria, Cairo, Egypt.
P. D. Weidman
Affiliation:
Department of Mechanical Engineering, University of Colorado, Boulder, CO 80309, USA
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Abstract

The stability of circular Couette flow with radial heating across a vertically oriented annulus with inner cylinder rotating and outer cylinder stationary is investigated using linear stability theory. Infinite aspect ratio and constant fluid properties are assumed and critical stability boundaries are calculated for a conduction-regime base flow. Buoyancy is included through the Boussinesq approximation and stability is tested with respect to both toroidal and helical disturbances of uniform wavenumber. Symmetries of the linearized disturbance equations based on the sense of radial heating and the sense of cylinder rotation and their effect on the kinematics and morphology of instability waveforms are presented. The numerical investigation is primarily restricted to radius ratios 0.6 and 0.959 at Prandtl numbers 4.35, 15 and 100. The results follow the development of critical stability from Taylor cells at zero heating through a number of asymmetric modes to axisymmetric cellular convection at zero rotation. Increasing the Prandtl number profoundly destabilizes the flow in both wide and narrow gaps and the number of contending critical modes increases with increasing radius ratio. Specific calculations made to compare with the stability measurements of Snyder & Karlsson (1964) and Sorour & Coney (1979) exhibit good agreement considering the idealizations built into the linear stability analysis.

Type
Research Article
Information
Journal of Fluid Mechanics , Volume 220 , November 1990 , pp. 53 - 84
Copyright
© 1990 Cambridge University Press

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