Article
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Preserved in Portico This version is not peer-reviewed
Effect of Jet Nozzle Position on Mixing Time in Large Tanks
Version 1
: Received: 1 June 2023 / Approved: 2 June 2023 / Online: 2 June 2023 (10:35:36 CEST)
Version 2 : Received: 21 July 2023 / Approved: 25 July 2023 / Online: 26 July 2023 (10:06:21 CEST)
Version 2 : Received: 21 July 2023 / Approved: 25 July 2023 / Online: 26 July 2023 (10:06:21 CEST)
A peer-reviewed article of this Preprint also exists.
Oluwadero, T.A.; Xuereb, C.; Aubin, J.; Poux, M. Effect of Jet Nozzle Position on Mixing Time in Large Tanks. Processes 2023, 11, 2200. Oluwadero, T.A.; Xuereb, C.; Aubin, J.; Poux, M. Effect of Jet Nozzle Position on Mixing Time in Large Tanks. Processes 2023, 11, 2200.
Abstract
The present investigation focuses on the impact of jet nozzle orientation on mixing time in a cylindrical tank. The aim is to identify nozzle positions that improve mixing performance and to elucidate the governing parameters that influence it. A water tank was employed for the experiment. The vertical inclination angle (α) and the horizontal inclination angle (β) of the jet nozzle determined the nozzle positions. Mixing time was determined using an inert tracer and spectrophotometry measurements. The findings show that the mixing time is significantly influenced by the position of the jet nozzle position. The accuracy of existing jet turbulence and the circulation models for the prediction of mixing time was evaluated for the different nozzle positions. Our results indicate that both models provide accurate predictions for the conventional centrally aligned (β = 0°), upward-pointing jet nozzle positions only (α > 0). For the other nozzle positions where β > 0° and at varying α, the data follow the same trends as the jet turbulence and circulation models, however, the proportionality constants vary. Shorter mixing times can be attributed principally to longer jet path lengths and therefore higher fluid entrainment and circulation, as well as higher dissipation rates per jet length squared. However, it is suspected that the 3-dimensional nature of the flow pattern generated in the tank also plays a non-negligible role since mixing is hindered when the nozzle points more towards the tank wall.
Keywords
Jet mixing; Mixing; Mixing time; Circulation time; Jet
Subject
Engineering, Chemical Engineering
Copyright: This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
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Commenter: Timothy OLUWADERO
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The commenter has declared there is no conflict of interests.
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Commenter's Conflict of Interests: I am one of the author
In this case we use fluorescein solution.