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Title: Experimental Study of Three-Dimensional Turbulent Offset Jets and Wall Jets
Authors: Agelin-Chaab, Martin
Supervisor: Tachie, Mark (Mechanical and Manufacturing Engineering)
Examining Committee: Kuhn, David (Mechanical and Manufacturing Engineering) Clark, Shawn (Civil Engineering) Rankin, Gary (University of Windsor)
Graduation Date: February 2011
Keywords: turbulence kinetic energy
particle image velocimetry
proper orthogonal decomposition
two-point velocity correlations
triple velocity products
harpin vortex
turbulenc production
Issue Date: 19-Oct-2010
Citation: Agelin-Chaab, M. & Tachie, M. F. 2010 Characteristics of Turbulent 3D Offset Jets. J. Fluids Eng., Accepted.
Agelin-Chaab, M. & Tachie, M. F. 2010 Characteristics of Turbulent Three-Dimensional Wall Jets. J. Fluids Eng., Accepted.
Agelin-Chaab, M. & Tachie, M. F. 2010 Characteristics and Structure of Turbulent 3D Offset Jets. Int. J. Heat Fluid Flow, Submitted.
Agelin-Chaab, M. & Tachie, M. F. June 2010 Characteristics of 3D Offset Jets. In proceedings of the 8th International ERCOFTAC Symposium on Engineering Turbulence Modeling and Measurements, Marseille, France.
Agelinchaab, M. & Tachie, M. F. August 2009 Characteristics of a 3D Turbulent Wall Jets and Offset Jets with Small Offset Ratios. In proceedings of the ASME Fluids Engineering Division Summer Meeting, FEDSM2009-78540, Vail, Colorado, USA
Agelinchaab, M. & Tachie, M. F. August 2009 Three-Dimensional Turbulent Wall Jets. In proceedings of the ASME Fluids Engineering Division Summer Meeting, FEDSM2009-78542, Vail, Colorado, USA
Abstract: An experimental study was designed to examine and document the development and structures of turbulent 3D offset jets. The generic 3D wall jets at the same Reynolds numbers was used as the basis of comparison. The experiments were performed using a high resolution particle image velocimetry technique to perform velocity measurements at three Reynolds numbers based on the jet exit diameter and velocities of 5000, 10000 and 20000 and four jet offset height ratios of 0.5, 1.0, 2.0 and 4.0. The measurements were performed in the streamwise/wall-normal plane from 0 to 120 jet exit diameters and in the streamwise/lateral plane from 10 to 80 jet exit diameters. The velocity data were analyzed using (i) mean velocities and one-point statistics such as turbulence intensities, Reynolds stresses, triple velocity products and some terms in the transport equations for the turbulence kinetic energy, (ii) two-point velocity correlations to study how the turbulence quantities are correlated as well as the length scale and angle of inclination of the hairpin-like vortex structures, and (iii) proper orthogonal decomposition to examine the energy distribution and the role of the large scale structures in the turbulence intensities and Reynolds shear stresses. The decay of the maximum mean velocities and spread of the jet half widths became independent of Reynolds number much earlier in the generic wall jet than the offset jets. The flow development is delayed with increasing offset heights. The decay rate and wall-normal spread rate increased with the offset heights, whereas the lateral spread rate decreased with offset heights, which is consistent with previous studies. The two-point auto-correlations and the proper orthogonal decomposition results indicate the presence of more large scale structures in the outer and self-similar regions than in the inner and developing regions. The iso-contours of the streamwise autocorrelations in the inner regions were inclined at similar angles of β = 11.2 ± 0.6 degrees, which are in good agreement with reported values in boundary layer studies. The angles decrease with increasing distance from the wall.
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