Flow fields in multistage stirred‐tank reactors using a combination of different impeller types

Matzke, M.; Ranft, E.; Dominkovic, Leon; Ulbricht, Mathias; Schultz, H. J.

doi:10.1002/cite.202255226

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Experimental Section 21 Torque Measurements1

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2023

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“…It has to be noted that the baffle setup differs from the literature recommendation of four baffles [11,15], which primarily applies to single-stage impeller systems. Previous studies [14,[19][20][21] have repeatedly shown that this standard setup is not sufficient to prevent surface motion and vortex formation in multi-stage impeller setups, whereas an increase of the number of baffles to six allows vortex-free measurements even in the fully turbulent flow regime [22]. The dimensionless baffle number, according to Liepe et al…”

Section: Experimental Section 21 Torque Measurementsmentioning

confidence: 99%

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

Matzke

Ranft

Dominkovic

et al. 2023

Chemie Ingenieur Technik

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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.

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