Flow downstream of a gap between wall-mounted obstacles
Abstract
An analysis of experimental data obtained from the flow downstream of a gap between two wall-mounted bar-type roughness elements in a thick turbulent boundary layer is presented. Data were gathered using hot-wire anemometry to characterize the velocity profiles and Reynolds shear stresses at centerline and off-centerline positions in the wake flow. Flow visualization, using graphite and alcohol on the surface around the gaps, was performed for gap sizes 0, 0.5, 1, 2, 5 and 10 obstacle heights. The layer initially accelerated through the gap, but deceleration in the lower part of the layer was not dependent on position in the gap. The centerline flow accelerated near the wall and decelerated in the wake. It is concluded that at least two secondary flows are present in the near-wake, one on each side of the gap.
- Publication:
-
Developments in Mechanics. Volume 12
- Pub Date:
- 1983
- Bibcode:
- 1983deme...12..337L
- Keywords:
-
- Air Flow;
- Flow Resistance;
- Open Channel Flow;
- Reynolds Stress;
- Turbulent Boundary Layer;
- Barriers;
- Gaps;
- Hot-Wire Anemometers;
- Reynolds Number;
- Velocity Distribution;
- Wind Tunnel Tests;
- Fluid Mechanics and Heat Transfer