Experimental investigation and modeling of local mass transfer rates in pure and contaminated Taylor flows

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In nature and most applications for Chemical, Biochemical, Medical and Environmental Engineering, the transport of molecules from one phase into another phase (gas/liquid or liquid/liquid) plays a dominant role to achieve high yields and purities. To use these transport processes at fluidic interfaces as efficient as possible a deep understanding of local phenomena is indispensable. These will be studied under well defined conditions in a Taylor flow, in circular and square capillaries with a diameter of 1 mm. Therefore local velocity fields will be measured by Micro-Particle Image Velocimetry and local concentration fields by Confocal Laser Scanning Microscopy with a spatial resolution of 5 μm. The mass transfer in the liquid film will be measured by a Confocal Two-Photon Fluorescence Technique with a spatial resolution of 1 μm. For mass transfer an oxygen/nitrogen pure water system will be used with a Ruthenium-complex as fluorescent dye. The impact of ionic and anionic surfactants on the shape and local mass transfer performance of fluidic interfaces will be investigated and modelled. With measurement techniques at the front edge of spatial resolution and the mathematical excellence of this priority program, new insights into local mass transfer processes at fluidic interfaces will be possible.