Accession Number : ADA329651

Title :   Film Cooling by a Pulsating Wall Jet.

Descriptive Note : Final rept. 15 Jan 94-14 Jan 97,

Corporate Author : ARIZONA UNIV TUCSON DEPT OF AEROSPACE AND MECHANICAL ENGINEERING

Personal Author(s) : Wygnanski, Israel J. ; Ortega, Alfonso ; Fasel, Hermann

PDF Url : ADA329651

Report Date : 18 JUN 1997

Pagination or Media Count : 136

Abstract : This report summarizes the results of an experimental, numerical, and theoretical project that was initiated in 1994 with funding under AFOSR Contract Number F49620-94-1-0131. The objective of the work was to perform a fundamental exploration of the heat transfer and fluid mechanics in a wall jet with emphasis on applying passive techniques to control or manipulate the rates of heat transfer. After constructing the apparatus, developing the instrumentation, and developing the computer codes for the numerical simulation and the models for the theoretical investigations, we proceeded to study the effects of heating and cooling on the steady laminar wall jet. We examined the evolution of small-amplitude perturbations which were externally introduced into the flow. The amplitudes of the disturbances were significantly increased in the second stage of the investigation and their effect on the flow and temperature field was analyzed. The primary finding suggests that Reynolds analogy is not as universally applicable as we were lead to believe primarily when the mean velocity profile and the mean temperature profile are different or when the flow is periodic.

Descriptors :   *HEAT TRANSFER, *FILM COOLING, *JET FLOW, *FLUID MECHANICS, MATHEMATICAL MODELS, THEORY, NUMERICAL ANALYSIS, PULSES, HEATING, PERTURBATIONS, AMPLITUDE, LAMINAR FLOW, REYNOLDS NUMBER.

Subject Categories : Fluid Mechanics

Distribution Statement : APPROVED FOR PUBLIC RELEASE