An investigation of surface roughness effects on adiabatic wall temperature
Abstract
The effects of surface roughness on adiabatic wall temperature were numerically investigated using a discrete-element roughness model. The definition of adiabatic wall temperature for a rough wall was developed and a mathematical approach formulated. The results of the investigation showed that roughness can have significant effects on adiabatic wall temperature. Recovery factors as low as 0.80, as compared to the usually accepted smooth wall value of 0.89, were found in the study. Hemispherically shaped roughness elements with various spacings and heights were examined at Mach numbers of 2.5 and 5.0 and Reynolds numbers 10 to the 6th to 10 to the 7th per foot. Because of the significant effects shown by this study and since no experimental data concerning roughness effects on adiabatic wall temperature were found, further experimental and analytical studies are indicated.
- Publication:
-
AIAA, 18th Fluid Dynamics and Plasmadynamics and Lasers Conference
- Pub Date:
- July 1985
- Bibcode:
- 1985fdpd.confU....H
- Keywords:
-
- Adiabatic Conditions;
- Computational Fluid Dynamics;
- Surface Roughness Effects;
- Wall Temperature;
- Boundary Layer Equations;
- Fins;
- Mach Number;
- Reynolds Number;
- Skin Friction;
- Temperature Profiles;
- Fluid Mechanics and Heat Transfer