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    Item type:Publication, Access status: with files ,
    Reaction systems for bubbly flows
    (Wiley-VCH, 2018-05-24)
    Paul, Melanie
    ;
    Strassl, Florian
    ;
    Hoffmann, Alexander
    ;
    Hoffmann, Marko
    ;
    Schlüter, Michael
    Reactive bubbly flows are at the heart of multiphase flows which are a major topic in chemical engineering since many bulk chemicals are produced in bubbly flows. However, the factors determining product yield and selectivity are often subject of complicated mass transfer effects. Herein, we describe the latest developments in the detection of mass transfer effects in bubbly flows. Coordination chemistry has given new impulses to this topic due to the possibility to synthesise tailored complex systems for the detection of O2 and NO with various time- and space-resolved techniques. For each chemical reaction system, a background section is summarised to allow the reader to get an overview of the different systems.
    Publicationtype: Journal Article
    Scopus© Citations 19  412  564
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    Item type:Publication, Access status: without files ,
    Test system for the investigation of reactive taylor bubbles
    (Wiley-VCH, 2017-07-06)
    Kastens, Sven
    ;
    Timmermann, Jens
    ;
    Strassl, Florian
    ;
    Rampmaier, Robert
    ;
    Hoffmann, Alexander
    Detailed analysis of reactive multiphase flows is still challenging due to the complex linked transport processes. Until now, there is no reliable and reproducible experimental method for gas-liquid flows, which enables the local measurement of dissolved species concentrations of educts, products, and side products at well-defined and reproducible hydrodynamic conditions. A vertically arranged glass channel is used to capture gas bubbles with well-defined wake structures. The hydrodynamic conditions in the wake can be predicted by dimensionless numbers and adapted for most industrially relevant systems. An experimental apparatus is presented for the investigation of the interdependency between hydrodynamics, mass transfer, and chemical reaction. The applicability of the setup is demonstrated with a chemical test system that shows a strong color shift from colorless to blue when the gas-liquid reaction takes place.
    Publicationtype: Journal Article
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