Bild_FP Felix Preiss

M.Sc. Felix Johannes Preiss

  • Postanschrift: Kaiserstr. 12
    Liefer- und Besucheranschrift: Gotthard-Franz-Straße 3
    Geb. 50.31, 4. OG
    D-76131 Karlsruhe

About myself

I studied chemical engineering and process engineering at the Karlsruhe Institute of Technology (KIT) from 2011 to 2017. During my bachelor's degree, I dealt with food processing technology as part of a major subject and had first contacts in my bachelor thesis with the numerical simulation of processes. I completed my master's degree in food process engineering and thermal process engineering with a master's thesis at the Institute of Food Process Engineering in the field of extrusion.
Meanwhile, I am a research scientist at the Institute of Food Process Engineering in the field of high-pressure homogenization.


Research interests

I am currently working on the investigation of velocity fields in orifices of high-pressure homogenizers in order to calculate locally resolved shear, strain and Raynold stresses. To investigate the influence of these stresses on the droplets in the emulsion, the deformed droplets are additionally visualized in the process. In particular, the influence of the trajectory of the drops and the scalability of the process should be investigated.



In order to be able to visualize the flow in the orifices experimentally, I use a μ-PIV (Micro-Particle Image Velocimetry) from Dantec with a microscope from Leica and optically accessible orifices which are specially made for this process. In addition, many analytical methods for the characterization of drop collectives and emulsions are available, so that the droplet size distribution, flow and interface behavior of the used systems can be described in detail.


Current offers for bachelor and master theses
title start type advisor


Influence of the droplet trajectory on the resulting droplet deformation and droplet size distribution in high‐pressure homogenizer orifices
Preiss, F. J.; Rütten, E.; Tröster, A.; Gräf, V.; Karbstein, H. P.
2022. The Canadian Journal of Chemical Engineering, 100 (7), 1451–1467. doi:10.1002/cjce.24363
Does Cavitation Affect Droplet Breakup in High‐Pressure Homogenization? Insights into Local Effects 
Preiss, F. J.; Hetz, M.; Karbstein, H. P.
2022. Chemie - Ingenieur - Technik, 94 (3), 374–384. doi:10.1002/cite.202100104
Development of a pressure stable inline droplet generator with live droplet size measurement
Preiss, F.; Dagenbach, T.; Fischer, M.; Karbstein, H. P.
2020. ChemEngineering, 4 (60), 1–14. doi:10.3390/chemengineering4040060


Droplet breakup mechanisms at different droplet trajectories during high-pressure homogenization
Preiss, F. J.; Karbstein, H. P.
2021, May 26. EFCE - Alternative food technologies - Science meets industry (2021), Online, May 25–27, 2021
Untersuchung des Tropfenaufbruchs in koaxialen Lochblenden während der Hochdruckhomogenisation
Preiss, F. J.; Karbstein, H. P.
2021, March 12. Jahrestreffen der ProcessNet-Fachgruppen Lebensmittelverfahrenstechnik, Mischvorgänge, Grenzflächenbestimmte Systeme und Prozesse (2021), Online, March 11–12, 2021
Untersuchung des Tropfenaufbruchs in koaxialen Lochblenden während der Hochdruckhomogenisation
Preiss, F. J.; Karbstein, H. P.
2021, March 9. Jahrestreffen der ProcessNet-Fachgruppen "Abfallbehandlung und Wertstoffrückgewinnung, Energieverfahrenstechnik, Gasreinigung, Hochtemperaturtechnik, Rohstoffe" (2017), Frankfurt am Main, Germany, March 21–23, 2017
Comparison of µ-PIV flow pattern measurements and CFD simulation of high-pressure homogenizer orifices
Walzel, P.; Bisten, A.; Schaldach, G.; Preiss, F. J.; Karbstein, H. P.
2019, May 28. Jahrestreffen Reaktionstechnik gemeinsam mit der Fachgruppe Mehrphasenströmungen (2019), Würzburg, Germany, May 27–29, 2019


Numerical investigation of stresses leading to droplet deformation prior their breakup in high pressure homogenizers (HPH)
Rütten, E.; Preiss, F. J.; Karbstein, H. P.
2022, June 28. 18th European Student Colloid Conference (ESC 2022), Szeged, Hungary, June 26–30, 2022
Investigation on flow patterns, local stresses, and resulting droplet deformation in orifices during high-pressure homogenization
Preiss, F. J.; Kelemen, K.; Bisten, A.; Karbstein, H. P.
2019, March 5. Annual Meeting of the ProcessNet "Agglomeration und Schüttguttechnik" and "Lebensmittelverfahrenstechnik" (2019), Lausanne, Switzerland, March 5–7, 2019
Messaufbau zur Untersuchung der Tropfendeformation in Blenden in Abhängigkeit von der Aufgabeposition
Preiss, F. J.; Bisten, A.; Karbstein, H. P.
2018, March 6. Jahrestreffen der ProcessNet-Fachgruppen Mehrphasenströmungen, Wärme- und Stoffübertragung und Computational Fluid Dynamics (2018), Bremen, Germany, March 6–7, 2018