Change in Mixing Power of a Two-PBT Impeller When Emptying a Tank

Change in Mixing Power of a Two-PBT Impeller When Emptying a Tank

The paper presents research on the phenomenon of an increase in mixing power during the emptying of a tank with two 6-PBT45° axial impellers in operation, located on a common shaft, pumping the liquid to the bottom of the mixing tank. A large increase in mixing power took place when the free surface...

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Veröffentlicht in:Processes 2021-02, Vol.9 (2), p.341
Hauptverfasser: Stelmach, Jacek, Kuncewicz, Czesław, Adrian, Łukasz, Jirout, Tomaš, Rieger, Frantisek
Format: Artikel
Sprache:eng
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Axial flow pumps
Emptying
Free surfaces
Impellers
Liquid surfaces
Turbines
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container_issue 2
container_start_page 341
container_title Processes
container_volume 9
creator Stelmach, Jacek
Kuncewicz, Czesław
Adrian, Łukasz
Jirout, Tomaš
Rieger, Frantisek
description The paper presents research on the phenomenon of an increase in mixing power during the emptying of a tank with two 6-PBT45° axial impellers in operation, located on a common shaft, pumping the liquid to the bottom of the mixing tank. A large increase in mixing power took place when the free surface of the liquid was just above the upper edge of one of the impellers (hp/D < 0.1). This increase was even more than 50% compared to the design power for a fully filled mixing vessel. Admittedly, high motor overload, while not very long, may damage it. The study investigated the instantaneous torques acting on the impeller shaft during the emptying of the tank and the velocity distributions in planes r-z. On their basis, the mechanism of the phenomenon observed was determined and correlation relationships were given that permitted the calculation of the numerical values of the power increase factors.
doi_str_mv 10.3390/pr9020341
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source Elektronische Zeitschriftenbibliothek - Frei zugängliche E-Journals; MDPI - Multidisciplinary Digital Publishing Institute
subjects Axial flow pumps
Emptying
Free surfaces
Impellers
Liquid surfaces
Turbines
title Change in Mixing Power of a Two-PBT Impeller When Emptying a Tank
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