Untersuchung der Gasdichteverteilung in begasten Rührkesseln mit eintauchenden Rohrschlangen

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: Discussionmentioning

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.

“…Then, e.g., Oldshue and Gretton came up with a construction guideline , . Although some constructions of stirred vessels with helical coils and of vessels with and without baffles had been studied in the meantime , the guideline of Oldshue and Gretton for the helical coils is still often used for today's engineering.…”

Section: Introductionmentioning

confidence: 99%

Particle Image Velocimetry Compared to CFD Simulation of Stirred Vessels with Helical Coils

Jährling

Wolinski

Stefan

et al. 2017

The results of measurements using two different particle image velocimetry (PIV) systems (2D-PIV versus stereo-PIV) are compared and the obtained data with a coupled CFD simulation are also correlated. A stirred vessel with internal helical coil as additional heat exchanger is analyzed with these settings. Results for the velocity fields and turbulent kinetic energy distribution are shown and the feasibility of stereo-PIV measurements by using refractive index matching fluid is proven. This investigation provides a good accordance and consistency between the different PIV systems and the related CFD.