Jet diffusion in stagnant ambient fluid

Jet diffusion in stagnant ambient fluid

Abraham, G.

Thijsse, J.T. (promotor)
Van Spiegel, E. (promotor)

Civil Engineering and Geosciences

Hydraulic Engineering

1963-07-03

Submarine outfall disposal of domestic and industrial sewage is a method of disposal of steadily growing importance. The flow from an ocean outfall is essentially that of a submerged horizontal or vertical jet. Thus a study of the hydrodynamics of such jets is needed to evaluate the dilution of the sewage flow. A study of this kind is presented for the case of jets issuing vertically upwards and for jets issuing horizontally into heavier homogeneous ambient fluid. The results are summarized in Fig. 2-3, 2-5, 3-7 and 3-14, which show how the dilution along the axis of the jet depends on the initial difference in density between the jet and the ambient fluid and on the velocity of the jet at the nozzle. In.case of jets issuing vertically upwards into lighter ambient fluid, the fluid of the jet cannot penetrate in a vertical direction beyond a certain ceiling level. For the case of homogeneous lighter ambient fluid the ceiling level is given by Eqs (4-13) and (4-24). For the case of stratified lighter ambient fluid the ceiling level is given by Eqs (5-11) and (5-20). Knowledge of the ceiling level is required to predict possible submergence of the sewage field, which may occur when lighter warm surface water overlies colder heavier bottom water.

jet
waste water
diffusion

http://resolver.tudelft.nl/uuid:6ad300a4-94d9-44f7-9b1a-787d010d2844

Institutional Repository

doctoral thesis

(c) 1963 Abraham, G.