Effect of Jet Nozzle Position on Mixing Time in Large Tanks

Timothy Ayodeji Oluwadero; Catherine Xuereb; Joelle Aubin; Martine Poux

doi:10.20944/preprints202306.0185.v2

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preprints.org > engineering > chemical engineering > doi: 10.20944/preprints202306.0185.v2

Preprint Article Version 2 Preserved in Portico This version is not peer-reviewed

Effect of Jet Nozzle Position on Mixing Time in Large Tanks

Timothy Ayodeji Oluwadero

^* ,

Catherine Xuereb

Joelle Aubin

Martine Poux

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)

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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Comments (3)

Comment 1

Received: 26 July 2023
Commenter: Timothy OLUWADERO
Commenter's Conflict of Interests: Author

Comment: We enhance the analysis quality by guaranteeing the inclusion of all data, as shown in Figures 12b and 13a. Additionally, we enhance the article clarity by improving the comprehensibility of the highlighted section and incorporating Figures 1 and 3. Moreover, we rectified an omission in the calculation of Figure 7 X-axis.

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Comment 2

Received: 19 September 2023
Commenter:

OLALERE KAYODE ODENIYI

The commenter has declared there is no conflict of interests.

Comment: Lovely work, succinctly explained. mind if I ask what inert tracer was used? and what informed your choice of the tracer?

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Response 1 to Comment 2

Received: 20 September 2023
Commenter:

Timothy OLUWADERO

Commenter's Conflict of Interests: I am one of the author

Comment: Thank you for your comment. Tracer fluids are used to introduce variation in properties such as concentration, temperature etc., into a fluid system as passive scalars. This term denotes a property transported by fluid flow without directly impacting the flow itself. Essentially, the global evolution of the properties of the tracer fluid within the ambient fluid depends mainly on the motion of the ambient fluid, with the tracer fluid not influencing the ambient fluid motion. This allows us to determine the degree of homogeneity per time based on the flow dynamics.

In this case we use fluorescein solution.

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