Accession Number : ADA019559

Title :   Structure of the Turbulence in the Plane Wake Behind a Heated Flat Plate.

Descriptive Note : Technical rept.,

Corporate Author : JOHNS HOPKINS UNIV BALTIMORE MD DEPT OF MECHANICS AND MATERIALS SCIENCE

Personal Author(s) : Ali,Syed Firasat ; Kovasznay,Leslie S. G.

Report Date : AUG 1975

Pagination or Media Count : 141

Abstract : A slightly heated plane turbulence wake was obtained behind a flat plate in incompressible air flow. Hot-wire measurements were carried out to obtain the conventional averaged quantities, the intermittency properties and the conditional turbulent and non-turbulent zone averages of velocity and temperature and their fluctuations. On the basis of the measurements obtained, the question of self-preservation was examined and a limited self-preservation was found with some qualifications. In order to verify the approach of the flat-plate-wake to a universal plane turbulent wake structure, the results were compared with the existing data for the wake of a circular cylinder. The large scale turbulence structure and its role in momentum and heat transfer were studied by measuring two point space time correlations involving temperature, and streamwise and normal velocity fluctuations. (Author)

Descriptors :   *Turbulent flow, *Wake, Turbulence, Flat plate models, Incompressible flow, Air flow, Hot wire anemometers, Heating, Velocity, Temperature, Heat transfer, Momentum transfer, Correlation techniques, Space(Room), Time, Sampling, Wind tunnel models

Subject Categories : Fluid Mechanics

Distribution Statement : APPROVED FOR PUBLIC RELEASE