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Flow in a commercial steel pipe

Published online by Cambridge University Press:  08 January 2008

L. I. LANGELANDSVIK ,
G. J. KUNKEL  and
A. J. SMITS
L. I. LANGELANDSVIK
Affiliation:
Department of Energy and Process Engineering, Norwegian University of Science and Technology, N-7491 Trondheim, Norway
G. J. KUNKEL
Affiliation:
Department of Mechanical and Aerospace Engineering, Princeton University, Princeton NJ 08540, USA
A. J. SMITS
Affiliation:
Department of Mechanical and Aerospace Engineering, Princeton University, Princeton NJ 08540, USA
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Abstract

Mean flow measurements are obtained in a commercial steel pipe with krms/D = 1/26 000, where krms is the roughness height and D the pipe diameter, covering the smooth, transitionally rough, and fully rough regimes. The results indicate a transition from smooth to rough flow that is much more abrupt than the Colebrook transitional roughness function suggests. The equivalent sandgrain roughness was found to be 1.6 times the r.m.s. roughness height, in sharp contrast to the value of 3.0 to 5.0 that is commonly used. The difference amounts to a reduction in pressure drop for a given flow rate of at least 13% in the fully rough regime. The mean velocity profiles support Townsend's similarity hypothesis for flow over rough surfaces.

Type
Papers
Information
Journal of Fluid Mechanics , Volume 595 , 25 January 2008 , pp. 323 - 339
Copyright
Copyright © Cambridge University Press 2008

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