Experimental assessment of scale effects affecting two-phase flow properties in hydraulic jumps |
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Authors: | Frédéric Murzyn Hubert Chanson |
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Institution: | (1) ESTACA Campus Ouest, Parc Universitaire de Laval - Changé, Rue Georges Charpak, BP 76121, 53061 Laval Cedex 9, France;(2) Division of Civil Engineering, The University of Queensland, Brisbane, QLD, 4072, Australia |
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Abstract: | A hydraulic jump is the rapid transition from a supercritical to subcritical free-surface flow. It is characterised by strong
turbulence and air bubble entrainment. New air–water flow properties were measured in hydraulic jumps with partially developed
inflow conditions. The data set together with the earlier data of Chanson (Air bubble entrainment in hydraulic jumps. Similitude
and scale effects, 119 p, 2006) yielded similar experiments conducted with identical inflow Froude numbers Fr
1 = 5 and 8.5, but Reynolds numbers between 24,000 and 98,000. The comparative results showed some drastic scale effects in
the smaller hydraulic jumps in terms of void fraction, bubble count rate and bubble chord time distributions. The present
comparative analysis demonstrated quantitatively that dynamic similarity of two-phase flows in hydraulic jumps cannot be achieved
with a Froude similitude. In experimental facilities with Reynolds numbers up to 105, some viscous scale effects were observed in terms of the rate of entrained air and air–water interfacial area. |
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