The effect of inlet vorticity on the behaviour of secondary flow in curved circular pipes
Abstract
An experimental investigation was conducted on the relation between inlet and outlet vorticity of turbulent developing fluid flow in a 90-deg circular bend. Velocity measurements at the entry section were carried out by means of a pitot tube for two measuring stations, and a numerical method for differentiating the velocity distribution at inlet was used to compute the velocity normal to the main flow direction. Quantitative measurements of the three time mean velocity components were carried out at the outlet, using a laser-Doppler anemometer operated in the fringe mode, for a range of Reynolds number. The dependence of the strength of the secondary flow at outlet upon inlet mean vorticity is evaluated, and the effect of Reynolds number is assessed.
- Publication:
-
2nd International Symposium on Applications of Laser Anemometry to Fluid Mechanics
- Pub Date:
- 1985
- Bibcode:
- 1985alaf.symp....5R
- Keywords:
-
- Circular Tubes;
- Inlet Flow;
- Pipe Flow;
- Secondary Flow;
- Velocity Measurement;
- Vortices;
- Laser Doppler Velocimeters;
- Pitot Tubes;
- Reynolds Number;
- Velocity Distribution;
- Fluid Mechanics and Heat Transfer