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Real-Time Visualization of Internal and External Concentration Fields in Multiphase Systems via Laser-induced Fluorescence and Rainbow Schlieren Deflectometry During and After Droplet Production |
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| Authors: | Jens Stefan Heine Joschka Marco Schulz Henning Junne Lutz Böhm Matthias Kraume Hans-Jörg Bart |
| Affiliation: | 1. Technische Universität Kaiserslautern, Thermische Verfahrenstechnik, Gottlieb-Daimler Straße, 67663 Kaiserslautern, Germany;2. Technische Universität Berlin, Chair of Chemical and Process Engineering, Ackerstraße 76, 13355 Berlin, Germany |
| Abstract: | The applicability of laser-induced dye fluorescence (LIF) and rainbow schlieren deflectometry (RSD) for qualitative, non-invasive real-time visualization of spatial concentration distributions in two standard reference systems is presented. The combination of LIF and RSD enables measurements inside and outside of droplets and is able to overcome limitations of both measurement techniques. Experimental results in the presence of interfacial phenomena are compared and the connection between inner and outer effects is shown during droplet production at a capillary. |
| Keywords: | Concentration field Laser-induced fluorescence Marangoni convection Mass transfer Rainbow schlieren deflectometry Real-time visualization |