Turbulence at free surface in hydraulic jumps


Chaplin, J.R., Mouaze, D. and Murzyn, F. (2004) Turbulence at free surface in hydraulic jumps. In, Proceedings 2004 ASME Heat Transfer/Fluids Engineering Summer Conference, North Carolina, USA, 11 - 15 Jul 2004. 1092pp, PaperHT-FED04.

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Description/Abstract

In the context of recent work by Brocchini &
Peregrine [1,2], this paper aims to document free surface
profiles, and turbulence 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 miniature resistive wire gauges each comprising two
parallel 50 micron diameter wires with a separation of 1mm.
These instruments were calibrated dynamically over a range of
frequencies up to 20 Hz. Furthermore optical probes were used
to measure properties of the air phase within the jump,
including void fractions (up to 98%).
The present results extend the range of Froude
numbers for which two-phase measurements in hydraulic jumps
are available, and, in most respects, confirm earlier results
obtained with different experimental techniques. Length scales
at the free surface are deduced from cross-correlation analysis
of wire gauge measurements, and are compared with similar
data obtained from images of the surface.

Item Type: Conference or Workshop Item (Paper)
Additional Information: ISBN Book: 0791846903 ISBN CD-ROM: 0791837408
Subjects: T Technology
T Technology > TA Engineering (General). Civil engineering (General)
Divisions: University Structure - Pre August 2011 > School of Civil Engineering and the Environment
ePrint ID: 53671
Date Deposited: 30 Jul 2008
Last Modified: 27 Mar 2014 18:36
URI: http://eprints.soton.ac.uk/id/eprint/53671

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