Turbulent flow over rectangular roughness elements in annular ducts
Abstract
Numerical simulation of turbulent, incompressible flows in annuli with spatially periodic variation in cross sectional area has been performed. Results are presented for flows in annuli with rectangular roughness elements on the inner tube surface. For the geometry under consideration, the effects of the turbulators was seen to be a strong function of Reynolds number. At a channel Reynolds number of 20,000, the turbulent kinetic energy was seen to increase by only 10 percent due to the presence of roughness elements. For a channel Reynolds number of 100,000, however, the turbulent kinetic energy increase was 50 percent.
- Publication:
-
AIAA, Fluid Dynamics, 21st Plasma Dynamics and Lasers Conference, 21st, Seattle, WA, June 18-20, 1990. 17 p.
- Pub Date:
- June 1990
- Bibcode:
- 1990fdpd.confU....K
- Keywords:
-
- Annular Ducts;
- Computational Fluid Dynamics;
- Convective Heat Transfer;
- Reynolds Number;
- Surface Roughness Effects;
- Turbulent Flow;
- Cross Sections;
- Diffusion;
- Kinetic Energy;
- Pressure Drop;
- Thermal Resistance;
- Two Dimensional Flow;
- Fluid Mechanics and Heat Transfer