A laser Doppler anemometer for viscous sublayer measurements
Abstract
An individual realization laser Doppler anemometer has been developed for measurements in the highly turbulent velocity field of the viscous sublayer. The anemometer employs an optical system which cancels pedestal frequencies and eliminates a critical filter setting. The optics are arranged so that the laser beams are parallel to the channel wall and the probe-volume dimension normal to the wall is reduced with a one dimensional beam expander. Mean and fluctuation measurements of the streamwise velocity are presented for fully developed, two dimensional channel flow of water at two Reynolds numbers.
- Publication:
-
2nd International Workshop on Laser Velocimetry, Volume 2
- Pub Date:
- 1974
- Bibcode:
- 1974lave....2...68K
- Keywords:
-
- Channel Flow;
- Laser Doppler Velocimeters;
- Turbulent Boundary Layer;
- Two Dimensional Flow;
- Viscous Fluids;
- Data Reduction;
- Flow Distribution;
- Pulsed Lasers;
- Velocity Distribution;
- Water Flow;
- Instrumentation and Photography