The New Jersey Institute of Technology's
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Title:	Experimental investigation of submerged, turbulent, axisymmetric air jet impinging on a flat plate
Author:	Xiao, Lan
View Online:	njit-etd1993-163 (xi, 108 pages ~ 1.8 MB pdf)
Department:	Department of Mechanical and Industrial Engineering
Degree:	Master of Science
Program:	Mechanical Engineering
Document Type:	Thesis
Advisory Committee:	Hrycak, P. (Committee chair) Harnoy, Avraham (Committee member) Geskin, E. S. (Committee member)
Date:	1993-05
Keywords:	Air jets Jets -- Fluid dynamics Turbulent boundary layer
Availability:	Unrestricted
Abstract:	Experimental investigation was carried out on the flow characteristics of a circular, submerged, turbulent, axisymmetric air jet impinging normally on a smooth, flat, square, Lucite plate and a sand paper covered plate. Jet issuing from a circular nozzle of 0.5 inch diameter while the Reynolds Number varying from 10,000 to 85,000 was investigated. The flow can be considered incompressible since the pressure and the velocity of the jet were not too high, with Mach Number of the order of 0.3. Various flow parameters were measured to obtain the velocity and pressure distributions at the surface of the flat Lucite plate, along the centerline and on the cross section of the normal impinging jet. In particular, it is shown that the potential core length of free jet a weak function of the Reynolds Number. it has also been demonstrated that impinging jets have very similar characteristics as free jets, except at the vicinity of the target plate. The flow profile in the deflection zone and the wall jet zone were analyzed experimentally and most of the results found to conform with the works of previous investigators. Some of the results come opposite to the results obtained by the previous investigators. Recommendations are made at the end of this thesis. They give other and future investigators some suggestions to further this experiment.