Combining laser Doppler anemometry and laser-induced fluorescence for measuring mass transport in stratified flows

Herman W.H.E. Godefroy

doi:10.1117/12.150575

6 August 1993 Combining laser Doppler anemometry and laser-induced fluorescence for measuring mass transport in stratified flows

Herman W.H.E. Godefroy

Author Affiliations +

Proceedings Volume 2052, Fifth International Conference on Laser Anemometry: Advances and Applications; (1993) https://doi.org/10.1117/12.150575
Event: Laser Anemometry: Advances and Applications: Fifth International Conference, 1993, Koningshof, Veldhoven, Netherlands

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.

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Herman W.H.E. Godefroy "Combining laser Doppler anemometry and laser-induced fluorescence for measuring mass transport in stratified flows", Proc. SPIE 2052, Fifth International Conference on Laser Anemometry: Advances and Applications, (6 August 1993); https://doi.org/10.1117/12.150575

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