Felix Kexel, M.Sc.

Eißendorfer Str. 40, Building N, Room 1.082

Telephone +49 40 42878-4663

E-Mail: Felix Kexel, M.Sc.


Research

DFG Priority Project 1740 - "Reactive Bubbly Flows"

 

How are the diffrent timescales of fluid dynamic mixing, mass transfer and reaction kinetics imapcting the yield and selectivity of competitive-consecutive gas-liquid reactions?

Applying measuring techniques as Particle Image Velocimetry (PIV), Laser Induced Fluorescence (LIF) or imaging UV-VIS Spectroscopy to obtain information on velocity and concentration fields of primary and secondary products in the wake of rising gas bubbles


Education

Graduate Teaching Assistant

  • Fluid Mechanics in Process Engineering (Winter term)

 


Supervised Theses

Current Thesis:
  • "Experimentelle Untersuchung des Einflusses der Fluiddynamik auf eine kompetitiv-konsekutive Reaktion in einer Hele-Shaw Zelle" [Working Title], Rene Weglewski, Master thesis
Finished Thesis:
  • "Taylor Bubbles in Organic Solvents", Sina Bertram, Bachelor thesis, 2022
  • "Computation of Unsteady Mass Transfer in Bubble Wakes by Means of 2D Lagrangian Analysis", Lotta Kursula, Master thesis, 2022
  • "Anwendung der Penetrationstheorie auf lokale Stofftransportprozesse an Taylor Blasen", Benjamin Rahimian, Bachelor thesis, 2022
  • "Characterization of the fluid dynamic properties of a Methanol based chemical reaction", Noah von Schnitzler, Bachelor thesis, 2021
  • "Taylor Bubble Generation Using a Selonoid Valve", Tarlan Ramazanli, Project Work 2021
  • "Detailed investigations of bubble trajectories in clean and contaminated systems", Sam Dors, Bachelor thesis, 2020
  • "Determination of mass transfer coefficients from single Taylor bubbles in contaminated systems – a study for industrial applications", Aaron Kaulbarsch, Bachelor thesis, 2019
  • "Experimentelle Analyse des Einflusses von organischen Lösemitteln auf die Hydrodynamik von Taylorblasen am Bespiel von Acetonitril", Carolin Lohmann, Bachelor thesis, 2019


Oral and Poster Presentations

  • Kexel, F.; Bertram, S.; Mehrbach, T.; von Kameke, A.; Hoffmann, M.; Tomiyama, A.; Schlüter, M.: "Influence of Taylor Bubble Shapes on Wake Structures" 4th International Symposium on Multiscale Multiphase Process Engineering, Berlin, 2022, poster presentation
  • Radmehr, A; Kexel, F.; von Kameke, A.; Hoffmann, M.; Schlüter, M.: "Local Velocity Fields at Taylor Bubbles in Methanol" 11th Workshop Chemical and Biological Mico Laboratory Technology 2022, Ilmenau, 2022, oral presentation
  • Kexel, F.; von Kameke, A.; Hoffmann, M.; Schlüter, M.: "Fluid Dynamics of Taylor Bubbles in Organic Solvents" ProcessNet Jahrestreffen Mehrphasenströmungen, Mechanische Flüssigkeitsabtrennung & Zerkleinern und Klassieren 2022, virtual, 2022, oral presentation
  • Kexel, F.; von Kameke, A.; Hoffmann, M.; Schlüter, M.: "Investigation on Velocity and Concentration Fields at Taylor Bubbles in a Reactive Bubbly Flow" Dispersed Two-Phase Flows 2021, virtual, 2021, oral presentation
  • Kexel, F.; von Kameke, A.; Hoffmann, M.; Schlüter, M.: "Influence of Fluid Dynamics on the Selectivity of Competitive Consecutive Gas Liquid Reactions" 13th European Congress of Chemical Engineering (ECCE13), virtual, 2021, oral presentation
  • Kexel, F.; von Kameke, A; Hoffmann, M.; Schlüter, M.: "Optimization of Chemical Reactions with Tailored Flow Strucures" ProcessNet Jahrestreffen Reaktionstechnik 2021, virtual, 2021, poster presentation
  • Kexel, F.; von Kameke, A; Hoffmann, M.; Schlüter, M.: "Investigation of the influence of fluid dynamics on the selectivity of fast gas-liquid reactions by means of high speed imaging UV/VIS spectroscopy at a Taylor bubble setup" ProcessNet Jahrestreffen Mehrphasenströmungen & CFD 2021, virtual, 2021, poster presentation
  • Kexel, F.; von Kameke, A.; Colombi, R.; Rüttinger, S.; Hoffmann, M.; Schlüter, M.: "Inverstigation of Reactive Mass Transfer Processes at Single Rising Bubbles by Means of Time-Resolved Scanning Laser Induced Fluorescence" 12th European Congress of Chemical Engineering (ECCE12), Florence, Italy, 2019, oral presentation 
  • Kexel, F.; Rüttinger, S.; Kastens, S.; von Kameke, A.; Oßberger, M.; Hoffmann, M.; Schlüter, M.: "Does the wake structure in bubbly flows affect yield and selectivity of a competitive consecutive reaction? – A Taylor-Bubble study" ProcessNet Jahrestreffen Reaktionstechnik & Mehrphasenströmungen 2019, Würzburg, 2019, oral presentation


Publications

Article

  • Frey T.; Kexel F.; Dittmer K.R.; Bohne S.; Hoffmann M.; Trieu H.K.; Schlüter M. (2022). A Novel Approach for Visualizing Mixing Phenomena of Reactive Liquid-Liquid Flows in Milli- and Micro-Channels. Frontiers in Chemical Engineering. 4. 874019 [Abstract] [doi]

  • Kexel, F.; Kameke, A.v.; Hoffmann, M.; Schlüter, M. (2021). The influence of fluid dynamics on the selectivity of fast gas–liquid reactions in methanol. Chemical Engineering and Processing - Process Intensification. [Abstract] [doi]

  • Kexel, F.; Kameke, A.v.; Oßberger, M.; Hoffmann, M.; Klüfers, P.; Schlüter, M. (2020). Bildgebende UV/VIS Spektroskopie zur Untersuchung des Einflusses der Fluiddynamik auf die Selektivität und Ausbeute von schnellen konkurrierenden konsekutiven gasflüssig Reaktionen. Chemie Ingenieur Technik. 93. (1-2), 297-305 [Abstract] [doi] [www]

  • Kexel, F.; Kameke, A.v.; Tenhaus, J.; Hoffmann, M.; Schlüter, M. (2021). Taylor bubble study of the influence of fluid dynamics on yield and selectivity in fast gas-liquid reactions. Chemie Ingenieur Technik. 93. (5), 830-837 [Abstract] [doi]

Book Chapter

  • Böhm, L.; Merker, D.; Strassl F.; Herres-Pawlis, S.; Oßberger, M.; Klüfers P.; Schindler, S.; Guhathakurta, J.; Grottke, D.; Simon, S.; Rinke, G.; Hlawitschka, M.; von Kameke, A.v.; Kexel, F.; Schlüter, M.; Gast, S.; Tuttlies, U.; Nieken, U.; Hillenbrand, D.; Marschall, H.; Weiner, A.; Bothe, D.; Kraume, M.; (2021). Chemical Reactions at Freely Ascending Single Bubbles. 128. 545-581 [Abstract] [doi]

  • Gast, S.; Tuttlies, U.; Laurini, L.; Kexel, F.; Merker, D.; Böhm, L.; Taborda M. A.; Sommerfeld, M.; Kraume, M.; Schlüter, M.; Herres-Pawlis, S.; Nieken, U.; (2021). Investigation of Reactive Bubbly Flows in Technical Apparatuses. 128. 621-642 [Abstract] [doi]

  • Kexel, F.; Kastens, S.; Timmermann, J.; Kameke, A. v.; Schlüter, M. (2021). Experimental Investigation of Reactive Bubbly Flows—Influence of Boundary Layer Dynamics on Mass Transfer and Chemical Reactions. 267–307 [Abstract] [doi]

  • Schlüter, M.; Kexel, F.; Kameke, A. v.; Hoffmann, M.; Herres-Pawlis, S.; Klüfers, P.; Oßberger, M.; Turek, S.; Mierka, O.; Kockmann, N.; Krieger, W. (2021). Visualization and Quantitative Analysis of Consecutive Reactions in Taylor Bubble Flows. 507–543 [doi]