Laser anemometry velocity measurements in a heated turbulent flow
Abstract
Laser Doppler anemometry was used to obtain vertical velocity measurements from a tube containing a heated, turbulent flow. The flow was heated from a cold state to 500 C in passing through the cylinder and displayed an Re of 5000-50,000. A photomultiplier tube received the Doppler signal and emitted an analog signal that was proportional to the instantaneous velocity. Data were taken on the average velocity, the rate of turbulence, and the spectral distribution of the velocity fluctuations. The ratio of the friction velocity to the average maximum free stream velocity (maintained between 2-20 m/sec) was calculated at three temperatures to generate curves for comparisons with those predicted by the law of the wall, which was verified.
- Publication:
-
Academie des Sciences Paris Comptes Rendus Serie Sciences Mathematiques
- Pub Date:
- May 1983
- Bibcode:
- 1983CRASM.296.1363G
- Keywords:
-
- Flow Measurement;
- Flow Visualization;
- Laser Doppler Velocimeters;
- Pipe Flow;
- Temperature Effects;
- Turbulent Flow;
- Velocity Measurement;
- Velocity Distribution;
- Fluid Mechanics and Heat Transfer