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Experimental Investigation and Modelling of Local Mass Transfer Rates in Pure and Contaminated Taylor Flows

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Part of the book series: Advances in Mathematical Fluid Mechanics ((AMFM))

Abstract

In many industrial applications of chemical and bio-chemical engineering, new insights into mass transfer processes across fluidic interfaces are of high interest. Mass transfer processes across gas-liquid interfaces have been investigated for decades to understand the coupling of hydrodynamics and mass transport processes and to describe and correlate them for various gas-liquid flow apparatus and process parameters. The investigation of the linked transport processes and the understanding of their interaction is fundamental for the optimization of multiphase reactors and for the validation of numerical simulations, which are pointing at problems of higher complexity during the last years. One challenge for the investigation of gas-liquid flows is the highly stochastic behaviour of gas bubbles rising in liquids under turbulent flow conditions. For the investigation of local mass transfer processes at fluidic interfaces and the validation of numerical simulations, more well-defined and reproducible conditions are necessary. A suitable setup to study mass transfer at fluidic interfaces under well-defined and reproducible conditions is the gas-liquid flow through a small, straight capillary, called “Taylor bubble” for single bubbles and “Taylor flow” for bubbles in a chain. Taylor flows and Taylor bubbles have ideal properties for detailed investigation on the influence of hydrodynamics and mass transfer at clean and contaminated interfaces, where the shape oscillations are suppressed and the Taylor bubbles are self-centering within vertical channels. Therefore, in this work the local hydrodynamics and mass transfer processes in Taylor flows and at Taylor bubbles have been investigated with laser measurement techniques, to obtain a deeper insight into mass transfer processes at fluidic interfaces. Furthermore, experimental data for the guiding measure “Taylor flow” has been provided. The guiding measure has been established within the SPP 1506 to generate a reliable data basis for the validation of numerical simulations.

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Acknowledgements

The authors gratefully acknowledge the financial support provided by the German Research Foundation within the priority programme “Fluidic Interfaces”, DFG SPP 1506.

We would like to thank all other research groups of our project for the fruitful collaboration and discussion about the validation of these complex transport processes at fluidic interfaces.

We would like to thank Prof. Akio Tomiyama, Kobe University, Japan for the intensive collaboration and the PhD exchange of Mr. Shogo Hosoda in 2013, Mr. Jiro Aoki in 2015 and Mr. Sven Kastens in 2016. Our fruitful discussions and experimentally and numerical investigations of the effects of surfactants on transport processes lead to several joint talks on international conferences and publications.

We would like to thank Prof. Dr.-Ing. Irina Smirnova and Dr.-Ing. Sven Jakobtorweihen for setting up molecular dynamic simulations to investigate the mass transfer of CO2 molecules across a contaminated gas-liquid interface with surfactants.

Last but not least, we would like to thank the students who have worked on this project during their Bachelor or Master thesis or research projects: Krischan Sandmann, Caroline Otto and Maximilian Garbe.

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Correspondence to Michael Schlüter .

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Kastens, S., Meyer, C., Hoffmann, M., Schlüter, M. (2017). Experimental Investigation and Modelling of Local Mass Transfer Rates in Pure and Contaminated Taylor Flows. In: Bothe, D., Reusken, A. (eds) Transport Processes at Fluidic Interfaces. Advances in Mathematical Fluid Mechanics. Birkhäuser, Cham. https://doi.org/10.1007/978-3-319-56602-3_21

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