Behavior of low buoyancy jets in a linearly stratified fluid

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Abstract
The results of experiments on jets of neutral or small buoyancy discharging horizontally into a stagnant, linearly stratified fluid are presented. The jet was found to grow initially as if in an unstratified fluid, and then to abruptly collapse vertically and intrude as a horizontal density current. Results are presented in terms of dimensionless length scale ratios for the distance to collapse, the collapsed layer thickness, the entrained volume flux, the thickness of the entrained layer, and the rise height for the slightly buoyant case. Turbulence properties at the point of collapse were estimated, and it was found that collapse occurs when an internal Froude number for the largest turbulent eddies near the edge of the jet becomes equal to about 0.75.

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