Exit region of submerged laminar jets.

Date of Award


Degree Type


Degree Name



Mechanical, Automotive, and Materials Engineering

First Advisor

Sridhar, K.,


Applied Mechanics.




The exit region of a submerged laminar jet of a Newtonian fluid exiting from a long tube is numerically and experimentally studied for low Reynolds numbers. The numerical study was carried out using FLUENT, which is a finite difference package for modeling fluid flow. Based on FLUENT predictions, the pressure gradient near the jet exit is examined in detail. Within the tube for a Reynolds number of 5, there is a higher pressure gradient, as compared to Poiseuille flow. There is a reduced pressure gradient for Reynolds numbers of 20 and 50. These trends in pressure gradient within the tube can be explained by considering the axial variation of shear stress and momentum. An evaluation of the pressure at the jet exit plane indicates that there is a net positive pressure force across that plane for all Reynolds numbers. Experimental studies, in conjunction with a Laser Doppler Anemometer, were carried out using a mixture of glycerine-water (3:1) as the test fluid. The experimental velocity profile data and numerical predictions are in reasonably good agreement. For Reynolds numbers between 5 and 20, the flow in the downstream region of the jet exit is seen to affect the upstream flow. No significant effect is felt on the upstream flow for Reynolds numbers of 30 and 50. Source: Masters Abstracts International, Volume: 30-04, page: 1371. Co-Supervisors: K. Sridhar; G. W. Rankin. Thesis (M.A.Sc.)--University of Windsor (Canada), 1991.