Vergleich des Einflusses verschiedener Wärmetauscher‐Einbauten sowie Bodenformen auf das Strömungsfeld in Rührreaktoren

In this study, flow fields in stirred tank reactors are investigated by a fluorescence tracer method. For these measurements, a fluorescent dye is inserted into a stirred tank reactor and distributed by the impeller flow, following the characteristic main circulation pathways. By this means, the main flow fields can be detected and visualized. Originally developed and used for the investigation of viscoelastic fluids, the method was adapted for Newtonian fluids with low viscosity in this study, with impeller installation height and impeller Reynolds numbers selected as influencing parameters. The resulting flow fields in both single-and double-impeller setups match the known structures from literature excellently. Therefore, the developed fluorescence tracer method has proven to be a promising supplement to the established repertoire of fluid investigation methods, with little effort in both experiment itself as well as the following data analysis steps.

Section: Methodsmentioning

confidence: 99%

Investigation and Visualization of Flow Fields in Stirred Tank Reactors Using a Fluorescence Tracer Method

Matzke

Behrens

Steins

et al. 2022

“…This non-invasive, laser-optical measurement technique allows insight into the velocity of liquid or gas flows. Measurements take place in a specifically constructed measurement station that has been used for multiple studies featuring a variety of (laser-)optical methods already [1,9,19,[24][25][26][27].…”

Section: Flow Field Measurementsmentioning

confidence: 99%

Flow Field Investigations of Two‐Stage Stirrer Configurations Combining Axially and Radially Conveying Turbines

Matzke

Ranft

Dominkovic

et al. 2023

In this study, the flow fields of two‐stage impellers, consisting of combinations of different impeller types on one shaft, are investigated using stereo particle image velocimetry. Based on the results of torque measurements, diameters for different impellers are determined in order to achieve matching power input of the individual turbines. When implemented adequately, both selected impellers are able to contribute their respective characteristics, resulting in flow fields that differ significantly from those induced by single‐stage impellers as well as two‐stage setups consisting of identical impellers.

“…The stereo‐PIV is an indirect, optical, non‐invasive measurement method to determine the velocity of flowing fluids , which is explained in detail in Sect. .…”

Section: Theoretical Backgroundmentioning

confidence: 99%

Optical Measurement Method of Particle Suspension in Stirred Vessels

Wolinski

Ulbricht

Schultz

2019

Suspending particles in liquids is an important and versatile case for industrial stirring processes. By using advanced optical, non‐invasive measurement techniques like particle image velocimetry (PIV), it is possible to gain deep insights into the involved fluid dynamics without affecting the flow. However, for suspensions, the application of PIV is not trivial since both, suspended and tracer particles are present and need to be discerned during experiments. The here presented method development solves this problem and thus leads to a better insight into turbulent kinetic energy distribution, which can be utilized for process optimization through improved stirred vessel design.