Hydraulic jump basins with wedge-shaped baffles

This laboratory study deals with the hydraulic jump properties for an artificially roughened bed with wedge-shaped baffle blocks. The experiments were conducted for both smooth and rough beds with a Froude number in the range of 3.06≤F1≤10.95 and a relative bed roughness ranging 0.22≤KR≤1.4. The dat...

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Bibliographic Details
Published in:Journal of Zhejiang University. A. Science 2012-07, Vol.13 (7), p.519-525
Main Authors: Ellayn, Ashraf Fathy, Sun, Zhi-lin
Format: Article
Language:English
Subjects:
Baffles
Channels
Civil Engineering
Classical and Continuum Physics
Computational fluid dynamics
Engineering
Fluid flow
Froude number
Hydraulics
Industrial Chemistry/Chemical Engineering
Mathematical analysis
Mechanical Engineering
Roughness
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Summary:This laboratory study deals with the hydraulic jump properties for an artificially roughened bed with wedge-shaped baffle blocks. The experiments were conducted for both smooth and rough beds with a Froude number in the range of 3.06≤F1≤10.95 and a relative bed roughness ranging 0.22≤KR≤1.4. The data from this study were compared with those of rec-tangular baffle blocks. New experimental formulae were developed for determining the sequent depth ratio and the hydraulic jump length in terms of the inflow Froude number and relative bed roughness. Bdlanger＇s jump equation of a rectangular channel was extended to account for the implications of the bed shear stress coefficient attributable to channel bed roughness. It was found that, in comparison with the smooth bed, the wedge-shaped bed roughness reduced the sequent depth of the hydraulic jump by ap-proximately 16.5% to 30% and the hydraulic jump length by approximately 30% to 53%.
ISSN:1673-565X
1862-1775
DOI:10.1631/jzus.A1200037