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UP: Fachverband Umweltphysik

UP 13: Postersession Bodenkunde, Kryosphäre, Meßtechnik, Ozeanographie

UP 13.16: Poster

Donnerstag, 26. März 2015, 10:45–19:45, G/Foyer

Towards 3D-space visualization of concentration fields of air-water gas transfer — •Darya Trofimova, Christine Kräuter, and Bernd Jähne — Institute of Environmental Physics, Heidelberg, Germany

Laser-Induced Fluorescence techniques are widely used for flow visualization, but are hard to apply for visualization of air-water gas transfer across the mass boundary layer. Due to necessity of high spatial and temporal resolution to resolve the mass boundary layer and fast turbulent processes, visualization of concentration fields are mostly possible in 2 dimensional space only.

Therefore, it is of importance to modify the technique that simplifies the fluorescence scene which will make it possible to use multi camera set up for capturing in 3 dimensional space, to measure the thickness of the mass boundary layer and to detect boundary layer detachments (surface renewal events). As the technique is based on reaction of an alkaline gas (in current studies - ammonia) with acid water died with fluorescent pH indicator (Pyranine), it is possible to gain constant fluorescence intensity with a combination of certain reagents concentrations.

In this work we present the verification of developed technique by conducting the experiments at liner-wave tank facility with measuring one dimensional concentration profiles. The results show the range of ammonia and Pyranine concentrations as well as initial conditions to maintain in order to gain binary concentration fields.