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Investigation of the Velocity Field of Jets in Counter-Flow in the Vicinity of a Solid Wall Open Access


Other title
Offset Jet
Velocity Field
Wall Jet
Type of item
Degree grantor
University of Alberta
Author or creator
Mahmoudi, Mohammad
Supervisor and department
Fleck, Brian (Mechanical Engineering)
Examining committee member and department
Ghaemi, Sina (Mechanical Engineering)
Sanders, Sean (Chemical Engineering)
Flynn, Morris (Mechanical Engineering)
Sullivan, Pierre (Mechanical Engineering)
Department of Mechanical Engineering

Date accepted
Graduation date
Doctor of Philosophy
Degree level
This study presents experimental investigations showing the mean and fluctuating velocity field of a three dimensional round jet in counter-flow located in the vicinity of a solid wall. The jet to counter-flow velocity ratios ranged from 2.5 to 25 and the jet Reynolds numbers were from 1,000 to 10,000. The ratio of jet centerline distance from the wall over the jet diameter is changed from 0.5 to 4.3. The penetration of the flush mounted jet in counter-flow is measured and compared to the case in which there is no wall available. In addition, the penetration of the jet at various offset distances from the wall is measured and the effect of offset distance is analyzed. The results show that the flush mounted jet has the deepest penetration and as the jet offset distance increases, the penetration decreases to reach the penetration of a free jet in counter-flow. The jet offset distance creates a mechanism that controls the counter-flow entrainment into the jet. The jet velocity decay and spreading rate are analyzed and the effect of offset ratio is discussed. It is found that as the offset ratio increases, the jet velocity decays faster and its spreading rate rises. In addition, the amplitude of random oscillations of the flow increases when the distance of the jets from the side wall increases. The vortical structures of the flow are studied and their impact on the turbulence characteristics of the flow is explained. Two-point velocity correlation study shows that the size of turbulent structures of the flow becomes larger as the jet offset ratio increases. Also, the turbulent transport in the flow enhances dramatically as the jet gets higher distance from the side wall.
Permission is hereby granted to the University of Alberta Libraries to reproduce single copies of this thesis and to lend or sell such copies for private, scholarly or scientific research purposes only. The author reserves all other publication and other rights in association with the copyright in the thesis and, except as herein before provided, neither the thesis nor any substantial portion thereof may be printed or otherwise reproduced in any material form whatsoever without the author's prior written permission.
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