Turbulent boundary layer over a flat plate with strong stepwise heating
The turbulent boundary layer over a flat plate with stepwise wall temperature rise from room temperature to 1250/sup 0/K and free stream velocity of 10.5 m/s was studied. Thermal structures in the heated boundary layer were observed using high-speed schlieren cine. Mean and root-mean-square (rms) density distributions were obtained from Rayleigh scattering intensity measurements. Velocity statistics were provided by a single-component laser Doppler velocimetry (LDV) system. Mean and rms velocity profiles, the Reynolds stress, the streamwise and the cross-stream turbulent kinetic energy diffusion were determined. Data were collected by a computer-based data acquisition and control system. The overall shape of the thermal structures observed in the schlieren pictures of the heated boundary layer is similar to that of the large-scale turbulent structures in an isothermal turbulent boundary layer. Strong wall heating causes expansion of the boundary layer, but the effects of heating on the mean and rms velocities are small. The Reynolds stress near the surface is reduced due to the density decrease. The most important effect of the strong stepwise temperature rise is to change the turbulent kinetic energy diffusion pattern. Significant streamwise diffusion of kinetic energy is induced near the leading edge of the heating section, suggesting that in modeling this flow a modification of the boundary layer assumption would be required in this region.
- Research Organization:
- Lawrence Berkeley Lab., CA (USA)
- DOE Contract Number:
- AC03-76SF00098
- OSTI ID:
- 7031321
- Report Number(s):
- LBL-14942; CONF-820706-3; ON: DE83001554
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
420400* -- Engineering-- Heat Transfer & Fluid Flow
BOUNDARY LAYERS
DATA
ENERGY
ENERGY TRANSFER
EXPERIMENTAL DATA
FLOW RATE
FLUID FLOW
HEAT TRANSFER
HEATING
INFORMATION
KINETIC ENERGY
LAYERS
NUMERICAL DATA
PHOTOGRAPHY
PLATES
SCHLIEREN METHOD
TEMPERATURE DISTRIBUTION
TURBULENCE
VERY HIGH TEMPERATURE