Abstract
In storm waterways and at dam outlets, high-velocity supercritical flows are characterized by substantial air bubble entrainment. The entrainment of fine air bubbles and the strong turbulent mixing contribute both to the air-water transfer of volatile gases (e.g. oxygen, nitrogen, VOC). The paper describes new experimental data obtained in a 25 m long channel with a 4° slope. The analysis of the data provides new information on the air-water flow properties and on the distributions air-water interface area. Although the amount of entrained air is small (i.e. typically C mean < 0.12), the specific air-water interface area can reach over 100 m 2 per unit volume of air and water. The results are compared with an earlier prediction (Chanson, 1994) and confirm the significant contribution of air entrainment to air-water gas transfer in supercritical chute flows.
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