The entrainment rates of vertical and inclined jets impinging on a stratified interface are measured in water tank experiments. At moderate Richardson number, the entrainment rate of the vertical jet is proportional to Ri -1/2, independent of Reynolds number. The inclined jets are tilted at 15° from the vertical. In one case, the jet nozzle is rotated about a vertical axis, so that the inclined jet precesses, while in the other, it is stationary. The inclined jets entrain at a rate proportional to Ri -3/2, whether precessing or not. This behavior is consistent with a new model of stratified entrainment which accounts for vortex persistence.
Experiments in Fluids – Springer Journals
Published: Jun 13, 1997
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