Article
Version 1
Preserved in Portico This version is not peer-reviewed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 installation positions on mixing time in a cylindrical tank. The aim is to identify nozzle positions that achieve maximum mixing efficiency and to elucidate the governing parameters that enhance jet mixing performance. A water tank was employed for the experiment. The jet nozzle vertical inclination angle (α) and the horizontal inclination (β) determined the nozzle positions. Mixing time was determined by a tracer study, utilising a spectrophotometry approach. The findings suggest that the mixing time is significantly influenced by the jet nozzle positions and the extent of the swirling flow resulting from the horizontal placement of the jet nozzle. Regardless of the vertical inclination of the tangentially oriented nozzles, the mixing time increases with the frequency of the bulk fluid swirling flow, even when the free jet path length remains constant. The accuracy of existing models to predict mixing time was evaluated for both conventional centrally aligned (β = 0°) and newly investigated swirling flow-dominated configurations involving tangentially installed nozzles (β > 0°). Our results indicate that the turbulence jet and the circulation model provide accurate predictions for the conventional centrally aligned (β = 0°), upward-pointing jet nozzle installations. For the newly explored swirling flow-dominated configurations involving tangentially installed nozzles (β > 0°) at varying α, we present novel values for the constants of proportionality for both the turbulence jet model and the circulation model, which account for differences in mixing time. Other models largely exhibited either underestimation or overestimation of experimental data for both extreme nozzle installation positions.
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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