A particle image velocimetry was used to study shallow open channel turbulent flow over -type and -type transverse ribs of square, circular, and semi-circular cross sections. The ratio of boundary layer thickness to depth of flow varied from 50% to 90%. The mean velocities and turbulent quantities were evaluated at the top plane of the ribs to characterize interaction between the cavities and overlying boundary layer. It was found that the overlying boundary layer interacts more strongly with -type cavities than observed for -type cavities. The profiles of the mean velocities and turbulent statistics were then spatially averaged over a pitch, and these profiles were used to study the effects of rib type and cross section on the flow field. The mean velocity gradients were found to be non-negligible across the boundary layer, and the implications of this observation for momentum transport, eddy viscosity, and mixing length distributions are discussed. The results show that the skin friction coefficient, Reynolds stresses and mixing length distributions are independent of rib cross section for -type. For the -type ribs, significant variations in skin friction coefficient values, mean flow, and turbulence fields are observed between square ribs and circular/semi-circular ribs.
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e-mail: tachiemf@cc.umanitoba.ca
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August 2007
Technical Papers
PIV Study of Shallow Open Channel Flow Over - and -Type Transverse Ribs
M. F. Tachie,
M. F. Tachie
Department of Mechanical and Manufacturing Engineering,
e-mail: tachiemf@cc.umanitoba.ca
University of Manitoba
, Winnipeg, Manitoba, R3T 5V6, Canada
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K. K. Adane
K. K. Adane
Department of Mechanical and Manufacturing Engineering,
University of Manitoba
, Winnipeg, Manitoba, R3T 5V6, Canada
Search for other works by this author on:
M. F. Tachie
Department of Mechanical and Manufacturing Engineering,
University of Manitoba
, Winnipeg, Manitoba, R3T 5V6, Canadae-mail: tachiemf@cc.umanitoba.ca
K. K. Adane
Department of Mechanical and Manufacturing Engineering,
University of Manitoba
, Winnipeg, Manitoba, R3T 5V6, CanadaJ. Fluids Eng. Aug 2007, 129(8): 1058-1072 (15 pages)
Published Online: March 13, 2007
Article history
Received:
November 16, 2006
Revised:
March 13, 2007
Citation
Tachie, M. F., and Adane, K. K. (March 13, 2007). "PIV Study of Shallow Open Channel Flow Over - and -Type Transverse Ribs." ASME. J. Fluids Eng. August 2007; 129(8): 1058–1072. https://doi.org/10.1115/1.2746910
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