Chemical & Process Engineering

M.Sc.

Joschka Schulz

Research Associate

j.schulz@tu-berlin.de

+49 30 314 23171 / 72687

Room MAR 2.050 / ACK Z 65
Address Marchstr. 23
10587 Berlin

Transport processes and interfacial phenomena in multiphase systems containing surfactants

The transport processes in multiphase systems depend on the properties of the interface between the immiscible phases. Interfacially active substances occur in a variety of industrial applications: on the one hand, they are deliberately used to intensify processes, or they are present undesirably, for example as impurities or by-products. Through adsorption and desorption at the interface (see figure at the top), they have a significant influence on the transport processes that occur and consequently on important process variables.

In addition to the adsorption of the surface-active molecules at the interface, other interfacial effects occur, such as the Marangoni effect. In work already carried out, both a reduction and a possible improvement in mass transfer have been observed. The prediction of the occurrence of interfacial phenomena, of process variables and of a possible reduction or intensification of the transport processes in the presence of interfacially active substances represents a major challenge in multiphase systems.

This work focuses on fluid dynamics and mass transfer in disperse systems. The experimental data obtained in the present project by single droplet experiments show a superposition of the mentioned effects. Detailed spatially and temporally resolved measurements of fluid dynamics (see video in the middle) are used as a sensitive measurement method. In addition, mass transfer measurements on single droplets are performed. With help of the specifically constructed color gradient schlieren photography, the concentration field during the droplet ascent is visualized (see video at the bottom) to interpret the obtained results and to achieve a better understanding of the occurring interfacial phenomena.

Publications

2022

Schulz, J.M.; Merker, D.; Böhm, L.; Kraume, M.
Fluid dynamics and mass transfer in disperse multiphase systems: A single-drop study concerning the role of surfactant transfer
Chemie Ingenieur Technik, 94 (9) :1334
2022

2021

Heine, J.; Schulz, J.; Junne, H.; Böhm, L.; Kraume, M.; Bart, H.-J.
Real-time visualization of internal and external concentration fields in multiphase systems via Laser-induced fluorescence and Rainbow Schlieren Deflectometry during and after droplet production
Chemie Ingenieur Technik, 93 (1-2) :180-190
2021
ISSN: 1522-2640
Schulz, J.; Petzold, M.; Böhm, L.; Kraume, M.
Tropfenbewegung und Stofftransport in technischen Flüssig/flüssig-Systemen, Teil 1: Einzeltropfensedimentation ohne Grenzflächeneffekte
Chemie Ingenieur Technik, 93 (3) :353-363
2021
Schulz, J.; Petzold, M.; Böhm, L.; Kraume, M.
Tropfenbewegung und Stofftransport in technischen Flüssig/flüssig-Systemen. Teil 2: Auswirkung von Grenzflächeneffekten und Verunreinigungen
Chemie Ingenieur Technik, 93 (8) :1214-1222
2021

2020

Schulz, J.M.; Junne, H.; Böhm, L.; Kraume, M.
Measuring local heat transfer by application of Rainbow Schlieren Deflectometry in case of different symmetric conditions
Experimental Thermal and Fluid Science, 110 :109887
2020

2018

Hohl, L.; Panckow, R.; Schulz, J.; Jurtz, N.; Böhm, L.; Kraume, M.
Description of Disperse Multiphase Processes: Quo Vadis?
Chemie Ingenieur Technik, 90 (11) :1709-1726
2018
Schulz, J.; Junne, H.; Böhm, L.; Kraume, M.
Development of an experimental setup applying rainbow schlieren deflectometry for visualization and quantification of heat and mass transfer in multiphase systems
In Kähler, C. and Hain, R. and Scharnowski, S. and Fuchs, T., Editor, Proceedings of the 5th International Conference on Experimental Fluid Mechanics ICEFM 2018 Munich, Page 226-231
In Kähler, C. and Hain, R. and Scharnowski, S. and Fuchs, T., Editor
2018
Hohl, L.; Schulz, J.M.; Kraume, M.
Towards Drop Size Modeling in Three Phase Microemulsion Systems
Journal of Chemical Engineering of Japan, 51 (4) :383-388
2018

2016

Hohl, L.; Schulz, J.; Paul, N.; Kraume, M.
Analysis of physical properties, dispersion conditions and drop size distributions in complex liquid/liquid systems
Chemical Engineering Research and Design, 108 :210-216
2016
Pogrzeba, T.; Schmidt, M.; Hohl, L.; Weber, A.; Buchner, G.; Schulz, J.; Schwarze, M.; Kraume, M.; Schomäcker, R.
Catalytic Reactions in Aqueous Surfactant-Free Multiphase Emulsions
Industrial and Engineering Chemistry Research, 55 (50) :12765-12775
2016
Paul, N.; Schulz, J.; Kraume, M.
Determination of phase separation and mass transfer in complex micellar three phase systems
Chemical Engineering and Processing: Process Intensification, 99 :143-148
2016
ISSN: 0255-2701
Hohl, L.; Röhl, S.; Schulz, J.; Kraume, M.
Influence of Temperature and Composition on Dispersion Conditions and Stability of Liquid Multiphase Systems
Chemie Ingenieur Technik, 88 (9) :1303
2016
ISSN: 1522-2640

2015

Paul, N.; Röhl, S.; Schulz, J.M.; Kraume, M.
Auswirkungen von Grenzflächenphänomenen auf die Transport- und Trennprozesse in mizellaren dreiphasigen Systemen
Chemie Ingenieur Technik, 87 (8) :1078-1079
2015
ISSN: 1522-2640
Paul, N.; Schulz, J.; Kraume, M.
The fluid dynamics of droplets as a useful tool to determine the coverage and the adsorption kinetics of surfactants
Chemical Engineering & Technology, 38 (11) :1979-1984
2015
ISSN: 1521-4125
Paul, N.; Schulz, J.; Kraume, M.
Transport Processes in Micellar Three Phase Systems
Proceedings of the 2015 AIChE Annual Meeting
2015
ISBN
978-0-8169-1094-6