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Turbulent flow in smooth concentric annuli with small radius ratios

Published online by Cambridge University Press:  29 March 2006

K. Rehme
K. Rehme
Affiliation:
Institut für Neutronenphysik und Reaktortechnik, Kernforschungszentrum, 75 Karlsruhe, Germany
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Abstract

Fully developed turbulent flow through three concentric annuli was investigated experimentally for a Reynolds-number range Re = 2 × 104−2 × 105. Measurements were made of the pressure drop, the positions of zero shear stress and maximum velocity, and the velocity distribution in annuli of radius ratios α = 0.02, 0.04 and 0.1, respectively. The results for the key problem in the flow through annuli, the position of zero shear stress, showed that this position is not coincident with the position of maximum velocity. Furthermore, the investigation showed the strong influence of spacers on the velocity and shear-stress distributions. The numerous theoretical and experimental results in the literature which are based on the coincidence of the positions of zero shear stress and maximum velocity are not in agreement with reality.

Type
Research Article
Information
Journal of Fluid Mechanics , Volume 64 , Issue 2 , 19 June 1974 , pp. 263 - 288
Copyright
© 1974 Cambridge University Press

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