Laser Doppler measurements of laminar and turbulent flow in a pipe bend
Abstract
The streamwise components of velocity in the flow through a ninety degree bend of circular cross section for which the ratio of radius of curvature to diameter is 2.8 were measured. The development of strong pressure driven secondary flow in the form of a pair of counter rotating vortices in the steamwise direction is shown. Refractive index matching at the fluid wall interface was not employed; the displacement of the measurement volume due to refraction is allowed for in simple geometrical calculations.
- Publication:
-
Final Report Imperial Coll. of Science and Technology
- Pub Date:
- May 1982
- Bibcode:
- 1982icst.rept.....E
- Keywords:
-
- Flow Geometry;
- Flow Velocity;
- Laminar Flow;
- Pipe Flow;
- Secondary Flow;
- Turbulent Flow;
- Counter Rotation;
- Flow Measurement;
- Flow Visualization;
- Laser Anemometers;
- Refractivity;
- Wall Pressure;
- Fluid Mechanics and Heat Transfer