Experimental investigation of bubbly flow and turbulence in hydraulic jumps

Murzyn, Frédéric and Chanson, Hubert (2009) Experimental investigation of bubbly flow and turbulence in hydraulic jumps. Environmental Fluid Mechanics, 9 2: 143-159. doi:10.1007/s10652-008-9077-4

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Author Murzyn, Frédéric
Chanson, Hubert
Title Experimental investigation of bubbly flow and turbulence in hydraulic jumps
Journal name Environmental Fluid Mechanics   Check publisher's open access policy
ISSN 1567-7419
1573-1510
Publication date 2009-04
Year available 2008
Sub-type Article (original research)
DOI 10.1007/s10652-008-9077-4
Open Access Status File (Author Post-print)
Volume 9
Issue 2
Start page 143
End page 159
Total pages 17
Editor Benoit Cushman-Roisin
Place of publication Dordrecht, Netherlands
Publisher Springer - Netherlands
Language eng
Subject 090509 Water Resources Engineering
C1
970109 Expanding Knowledge in Engineering
Abstract Many environmental problems are linked to multiphase flows encompassing ecological issues, chemical processes and mixing or diffusion, with applications in different engineering fields. The transition from a supercritical flowto a subcritical motion constitutes a hydraulic jump. This flow regime is characterised by strong interactions between turbulence, free surface and air–water mixing. Although a hydraulic jump contributes to some dissipation of the flow kinetic energy, it is also associated with increases of turbulent shear stresses and the development of turbulent eddies with implications in terms of scour, erosion and sediment transport. Despite a number of experimental, theoretical and numerical studies, there is a lack of knowledge concerning the physical mechanisms involved in the diffusion and air–water mixing processes within hydraulic jumps, as well as on the interaction between the free-surface and turbulence. New experimental investigations were undertaken in hydraulic jumps with Froude numbers up to Fr = 8.3. Two-phase flow measurements were performed with phase-detection conductivity probes. Basic results related to the distributions of void fraction, bubble frequency and mean bubble chord length are presented. New developments are discussed for the interfacial bubble velocities and their fluctuations, characterizing the turbulence level and integral time scales of turbulence representing a “lifetime” of the longitudinal bubbly flow structures. The analyses show good agreement with previous studies in terms of the vertical profiles of void fraction, bubble frequency and mean bubble chord length. The dimensionless distributions of interfacial velocities compared favourably with wall-jet equations. Measurements showed high turbulence levels. Turbulence time scales were found to be dependent on the distance downstream of the toe as well as on the distance to the bottom showing the importance of the lower (channel bed) and upper (free surface) boundary conditions on the turbulence structure.
Keyword Hydraulic jumps
Froude number
Two-phase flows
Void fraction
Bubble frequency
Mean bubble chord length
Interfacial velocity
Turbulence level
Turbulence time scale
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Q-Index Code C1
Q-Index Status Provisional Code
Additional Notes The full bibliographic details are: MURZYN, F., and CHANSON, H. (2009). "Experimental Investigation of Bubbly Flow and Turbulence in Hydraulic Jumps." Environmental Fluid Mechanics, Vol. 9, No. 2, pp. 143-159 (DOI: 10.1007/s10652-008-9077-4) (ISSN 1567-7419 [Print] 1573-1510 [Online]).

Document type: Journal Article
Sub-type: Article (original research)
Collection: School of Civil Engineering Publications
 
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Created: Thu, 26 Mar 2009, 10:05:15 EST by Hubert Chanson on behalf of School of Civil Engineering