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Proceedings Paper

Combining laser Doppler anemometry and laser-induced fluorescence for measuring mass transport in stratified flows
Author(s): Herman W.H.E. Godefroy
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Paper Abstract

For stratified flows it is important to know the mass transport from the denser salt water layer through the turbulent mixing layer into the upper fresh water layer. Therefore it is necessary that both the velocity and salinity fluctuations are measured in the turbulent mixing layer. To realize these measurements with minimum disturbance of the flow in the measurement volume, (optical) 'non-contact' methods are needed. When adding a very low concentration of the fluorescent dye uranine to the salt water as a tracer and measuring the local intensity of the fluorescent light local salinity fluctuations can be measured. Thus an optical instrument has been developed that is a combination of an earlier developed immersible Laser Doppler Anemometer (LDA) and a new developed immersible Laser Induced Fluorometer (LIF). The optical path length in the water is only a few cm. So it is possible to measure in water with variations in the refractive index as is the case in turbulent mixing layers. With this instrument measurements were carried out during different phases of a stratified tidal flow in the so called 'Tidal Flume', a special large installation at DELFT HYDRAULICS. Detailed information about the instrument is presented, together with results of the first measurements.

Paper Details

Date Published: 6 August 1993
PDF: 8 pages
Proc. SPIE 2052, Fifth International Conference on Laser Anemometry: Advances and Applications, (6 August 1993); doi: 10.1117/12.150575
Show Author Affiliations
Herman W.H.E. Godefroy, Delft Hydraulics (Netherlands)


Published in SPIE Proceedings Vol. 2052:
Fifth International Conference on Laser Anemometry: Advances and Applications

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