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TECHNICAL PAPERS

Free Surface Length Scale Estimation in Hydraulic Jumps

[+] Author and Article Information
D. Mouaze

School of Civil Engineering and the Environment, University of Southampton, Southampton SO17 1BJ, United Kingdommouaze@meca.unicaen.fr

F. Murzyn

School of Civil Engineering and the Environment, University of Southampton, Southampton SO17 1BJ, United Kingdommurzyn@univ-mlv.fr

J. R. Chaplin

School of Civil Engineering and the Environment, University of Southampton, Southampton SO17 1BJ, United Kingdomjrc1@soton.ac.uk

J. Fluids Eng 127(6), 1191-1193 (May 20, 2005) (3 pages) doi:10.1115/1.2060736 History: Received July 21, 2004; Revised May 20, 2005

In the context of recent work by Brocchini and Peregrine [J. Fluid Mech., 449, pp. 225–254 (2001a); 449, pp. 255–290 (2001b)] in this paper we aim to document free surface elevations and free surface length scales in hydraulic jumps with Froude numbers between 1.98 and 4.82. Although information on bubble size, frequency, and velocities in hydraulic jumps is available in the literature, there is not much data on the features of the free surface, or on mixing layer thickness. In the present case, measurements at the free surface have been realized with two “homemade” miniature resistive wire gauges made of two parallel 50μm diameter wires 1mm apart. These instruments were calibrated dynamically over a range of frequencies up to 20Hz. The present results extend the range of Froude numbers for which two-phase measurements in hydraulic jumps are available. In most respects, it confirms earlier results obtained with different experimental techniques. Length scales at the free surface are deduced from a cross-correlation analysis of wire gauge measurements, and are compared with similar data obtained from images of the surface.

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Copyright © 2005 by American Society of Mechanical Engineers
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References

Figures

Grahic Jump Location
Figure 1

Hydraulic jump in the recirculating tank (Fr=3.65)

Grahic Jump Location
Figure 2

Sketch of the hydraulic jump setup

Grahic Jump Location
Figure 3

Scanning line position

Grahic Jump Location
Figure 4

Free surface and fluctuations profile for Fr=1.98

Grahic Jump Location
Figure 5

Free surface and fluctuations profile for Fr=3.65

Grahic Jump Location
Figure 6

Transverse free surface length scales

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