Lotta Kursula, M.Sc.

Eißendorfer Str. 38, Building O, Room 1.015

Telephone +49 40 42878-3293

E-Mail: Lotta Kursula, M.Sc.


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.


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


Publications

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]