Cross correlation technique for the measurement of particle velocities and stereoscopic flow visualization
Abstract
Point velocity measurements of particle motions in a stirred tank were successfully made by tracking and correlating particle shadow signals produced by crossed laser beams. Data were taken to prove the validity of the technique and to demonstrate its usefulness for fluid and particle velocity measurements. Flows at four positions (three in a tank stirred by a pitched six blade turbine, the fourth in a tank stirred by a Rushton impeller) were studied. The positions were chosen to provide information about the nature of the jet flow at the exit of the pitched blade turbine, in a vertical wall flow, in an intermittent region, and in the jet of the Rushton impeller. Velocity vector diagrams of the flows were made to demonstrate the variety of flow patterns existing at various locations in a stirred tank. In addition to these diagrams, total mass flow, total momentum flow, total energy flow, event activity, and the mass average velocity are shown as functions of direction.
- Publication:
-
Ph.D. Thesis
- Pub Date:
- November 1977
- Bibcode:
- 1977PhDT........31T
- Keywords:
-
- Cross Correlation;
- Flow Visualization;
- Particle Motion;
- Stereoscopy;
- Flow Distribution;
- Impellers;
- Jet Flow;
- Laser Outputs;
- Turbine Blades;
- Velocity Measurement;
- Wall Flow;
- Fluid Mechanics and Heat Transfer