Characteristics of turbulent flow in submerged jumps on rough beds

Dey, Subhasish ; Sarkar, Arindam (2008) Characteristics of turbulent flow in submerged jumps on rough beds Journal of Engineering Mechanics, 134 (1). pp. 49-59. ISSN 0733-9399

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The results of an experimental investigation on the flow field in submerged jumps on horizontal rough beds, detected by an acoustic Doppler velocimeter, are presented. Experiments were conducted for the conditions of submerged jumps, having submergence factors from 0.96 to 1.85 and jet Froude numbers from 2.58 to 4.87, over rough beds of Nikuradse's equivalent sand roughness equaling 0.49, 0.8, 1.86, and 3 mm. The vertical distributions of time-averaged velocity components, turbulence intensity components, and Reynolds stress at different streamwise distances from the sluice opening and the horizontal distribution of bed-shear stress are plotted. Vector plots of the flow field show that the rate of decay of jet velocity in a submerged jump increases with increase in bed roughness. The flow characteristics on rough beds, being different from those on smooth bed, are discussed from the point of view of similarity, growth of the length scale, and decay of the velocity and turbulence characteristics scales. The most important observation is that the flow in the fully developed zone is found to be self-preserving.

Item Type:Article
Source:Copyright of this article belongs to American Society of Civil Engineers.
Keywords:Boundary Layers; Hydraulic Jumps; Open Channels; Steady Flow; Submerged Jets; Turbulent Flow; Channel Beds
ID Code:78830
Deposited On:23 Jan 2012 04:01
Last Modified:23 Jan 2012 04:01

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