Scale effects of air entrained by hydraulic jumps within closed conduits

While there has been a great deal of research in air entrainment at hydraulic jumps within closed conduits, limited research has specifically addressed size-scale effects. To determine the significance of these effects in closed conduits, air flow measurements were taken in four different-sized circ...

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Bibliographic Details
Published in:Journal of hydraulic research 2011-02, Vol.49 (1), p.90-95
Main Authors: Mortensen, Joshua D., Barfuss, Steven L., Johnson, Michael C.
Format: Article
Language:English
Subjects:
Air entrainment
closed conduit
Conduits
Earth sciences
Earth, ocean, space
Entrainment
Exact sciences and technology
Fluid dynamics
Fluid flow
hydraulic jump
Hydraulics
Hydrology. Hydrogeology
Pipe
Scale effect
Studies
temperature effect
Temperature effects
Water temperature
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Summary:While there has been a great deal of research in air entrainment at hydraulic jumps within closed conduits, limited research has specifically addressed size-scale effects. To determine the significance of these effects in closed conduits, air flow measurements were taken in four different-sized circular pipes with similar Froude numbers. Additionally, specific measurements were taken in one of the pipes with various water temperatures to identify any effects from changing fluid properties. The results indicated that the percentage of air entrainment was not affected by the pipe size if the full length of the hydraulic jump was contained within the pipe. For this condition, the data from four different pipes show that size-scale effects of air entrained into hydraulic jumps within closed conduits are negligible. However, air entrainment was significantly affected by water temperature.
ISSN:0022-1686
1814-2079
DOI:10.1080/00221686.2010.536695