Direct measurement of velocity correlation functions using the Erdmann-Gellert rate correlation technique
- 1 February 1979
- journal article
- Published by IOP Publishing in Journal of Physics E: Scientific Instruments
- Vol. 12 (2) , 119-125
- https://doi.org/10.1088/0022-3735/12/2/013
Abstract
By use of a modified laser Doppler anemometer set-up and a commercial digital correlator, velocity auto- and cross-correlation functions are measured directly. These functions determine time scales of velocity fluctuations as well as their first- and second-order statistics. The technique is demonstrated with flows of perfect time periodicity, i.e. Taylor vortices between rotating cylinders, and of a highly random nature, i.e. turbulence in an open flow channel.Keywords
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