Adiabatic and Diabatic Flow Studies by Shear Stress Measurements in Annuli With Inner Cylinder Rotation

[+] Author and Article Information
Y. A. G. Abdallah

Department of Mechanical Engineering, Bahrain University

J. E. R. Coney

Department of Mechanical Engineering, University of Leeds, Leeds LS2 9JT, England

J. Fluids Eng 110(4), 399-405 (Dec 01, 1988) (7 pages) doi:10.1115/1.3243570 History: Received August 29, 1986; Online October 26, 2009


The shear stress, occurring at the outer surface of a vertical annular gap formed by a stationary outer cylinder and a rotatable inner cylinder, was measured for a wide range of conditions, using a flush mounted probe. For annular gaps of radius ratio 0.8 and 0.9, axial flows of Reynolds numbers 100, 165, 200, and 300 were imposed under adiabatic and diabatic upflow and also diabatic downflow conditions. Under these conditions, the shear stress was determined over a range of Taylor numbers approaching 107 , the flow being fully developed. Diabatic conditions were achieved by the isothermal heating of the outer surface of the gap. A primary regime, in which Taylor vortices are absent or exist away from the outer surface of the gap was identified. Secondary, tertiary and quaternary regimes, in which the vortex flow is in contact with that surface ensued. The contrast between the results for diabatic upflow and diabatic downflow gives an understanding of the effect of natural convection in these regimes.

Copyright © 1988 by ASME
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