Research

DFG Project SCHL 617/27-1 and LI 899/19-1 "Fine Bubbles for Biocatalytic Processes: Microscale Phenomena and Novel Applications"

Due to the high volumetric mass transfer coefficients achieved by fine bubble aeration of reactors, the gaseous phase can be utilized more efficiently compared to macroscopic aeration. Furthermore, in biocatalytic processes, the reaction yield is increasing when using fine bubble aeration. However, the exact mechanisms causing these improvements are not fully understood yet. To gather knowledge in this regard, and therefore enable process optimization, the local mass transfer phenomena are studied in the scope of the project. This includes investigations of the interactions between enzymes and the concentration boundary layer of the bubbles on a microscale.

Poster at the 4th International Symposium on Multiscale Multiphase Process Engineering (MMPE)

Unsteady Mass Transfer in Bubble Wakes Analyzed by Lagrangian Coherent Structures in a Flat Bed Reactor

As of today, there is limited understanding of dissolved gas and liquid interactions in turbulent bubble wakes crucial for process optimization in the field of reactive bubbly flows. Lagrangian Coherent Structures (LCS) define the most attracting and repelling material lines.Computation in forward time yields most repelling material lines, whereas attracting lines are obtained in backward time. They act as transport barriers and are therefore particularly interesting for studies on transport phenomena. Finite Time Lyapunov Exponents (FTLE) provide information about material lines without restrictions on single manifolds

In this poster, we reveal how Lagrangian Coherent Structures govern the transport of dissolved gas in bubble wakes.

Oral and Poster Presentations

Kursula, L. Kexel, F., Hoffmann, M., Schlüter, M., von Kameke, A.: Unsteady Mass Transfer in Bubble Wakes Analyzed by Lagrangian Coherent Structures in a Flat Bed Reactor. FTZ 3i Talk: Conference on intelligent - industrial - innovations, HAW Hamburg 2022, Poster Presentation
Kursula, L. Kexel, F., Hoffmann, M., Schlüter, M., von Kameke, A.: Unsteady Mass Transfer in Bubble Wakes Analyzed by Lagrangian Coherent Structures in a Flat Bed Reactor. 4th International Symposium on Multiscale Multiphase Process Engineering (MMPE) 2022, Poster Presentation

Publications

Order by: Author Year Journal Bibtex Type of Publication

2022

Kursula, L.; Kexel, F.; Fitschen, J.; Hoffmann, M.; Schlüter, M.; Kameke, A.v.; (2022). Unsteady Mass Transfer in Bubble Wakes Analyzed by Lagrangian Coherent Structures in a Flat-Bed Reactor. Processes. 10. (12), [Abstract] [doi]