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Open AccessFeature PaperArticle

Analysis of Power Input of an In-Line Rotor-Stator Mixer for Viscoplastic Fluids

Department of Process Engineering, Czech Technical University in Prague, 16600 Prague, Czech Republic
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Processes 2020, 8(8), 916; https://doi.org/10.3390/pr8080916
Received: 26 June 2020 / Revised: 10 July 2020 / Accepted: 15 July 2020 / Published: 1 August 2020
(This article belongs to the Special Issue Advances in the Chemical Mixing Process)
In this work, the power draw and shear profile of a novel in-line rotor-stator mixer were studied experimentally and the laminar flow regime was simulated. The power draw of the rotor-stator mixer was investigated experimentally using viscoplastic shear-thinning fluid and the results of the obtained power consumptions were verified through simulations. The power draw constant and Otto-Metzner coefficient were determined from the result of experimental data and through simulations. A new method is suggested for the determination of the Otto-Metzner coefficient for the Herschel–Bulkley model and the term efficiency is introduced. It was shown that the proposed method can be applied successfully for the prediction of the Otto-Metzner coefficient for the mixing of viscoplastic shear-thinning fluids. The effect of geometry and rotor speed on power consumption and shear rate profile in the investigated mixer is discussed from the results of the simulations. It was found that numerical methods are a convenient tool and can predict the power draw of the in-line rotor-stator mixer successfully. View Full-Text
Keywords: in-line rotor-stator mixer; laminar regime; power draw; Otto-Metzner coefficient; Herschel–Bulkley model in-line rotor-stator mixer; laminar regime; power draw; Otto-Metzner coefficient; Herschel–Bulkley model
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Ayas, M.; Skocilas, J.; Jirout, T. Analysis of Power Input of an In-Line Rotor-Stator Mixer for Viscoplastic Fluids. Processes 2020, 8, 916.

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