TY - JOUR
T1 - Flow in a commercial steel pipe
AU - Langelandsvik, L. I.
AU - Kunkel, G. J.
AU - Smits, A. J.
N1 - Funding Information:
Financial support was received from ONR under Grant N00014-03-1-0320 and NSF under Grant CTS-0306691. L. I. L. was supported by a graduate research fellowship from the Norwegian Research Council, and G. J. K. was supported in part by Princeton University through a Council on Science and Technology Fellowship. Special thanks are due to Bob Bogart for contributing his technical skills to the design and installation of the pipe.
PY - 2008/1/25
Y1 - 2008/1/25
N2 - 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.
AB - 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.
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U2 - 10.1017/S0022112007009305
DO - 10.1017/S0022112007009305
M3 - Article
AN - SCOPUS:38049165555
SN - 0022-1120
VL - 595
SP - 323
EP - 339
JO - Journal of Fluid Mechanics
JF - Journal of Fluid Mechanics
ER -