Buoyant Jets with Three-Dimensional Trajectories

by Eric Hirst, Res. Engr.; ORNL-NSF Environmental Program, Oak Ridge Natl. Lab., Oak Ridge, TN,

Serial Information: Journal of the Hydraulics Division, 1972, Vol. 98, Issue 11, Pg. 1999-2014

Document Type: Journal Paper


A new integral method is devised to predict the hydrothermal behavior of buoyant jets discharged to infinite, flowing, stratified ambients through single submerged diffusers. The method, based on an integration of the basic partial differential equations written in a natural coordinate system, is more general than previous methods. In addition, a new generalized entrainment function is defined which includes the effects of internal turbulence, buoyancy, jet orientation, and cross flow. Only one of the four entrainment coefficients is obtained by fitting predictions to data. Theoretical predictions are compared with 29 different flows. Agreement between theory and data is good; this is particularly significant as the range in experimental flow variables is considerable and the four entrainment coefficients are maintained constant for all predictions.

Subject Headings: Jets (fluid) | Entrainment | Integrals | Water discharge | Water stratification | Submerging | Diffusion | Differential equations

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