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ChemEngineering 2018, 2(1), 11; https://doi.org/10.3390/chemengineering2010011

The Effects of the Properties of Gases on the Design of Bubble Columns Equipped with a Fine Pore Sparger

1
Scientific Computing Department, STFC, Rutherford Appleton Laboratory, Didcot OX11 0QX, UK
2
Department of Chemical Engineering, Aristotle University of Thessaloniki, 54124 Thessaloniki, Greece
*
Author to whom correspondence should be addressed.
Received: 2 February 2018 / Revised: 1 March 2018 / Accepted: 7 March 2018 / Published: 12 March 2018
(This article belongs to the Special Issue Bubble Column Fluid Dynamics)
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Abstract

This work concerns the performance of bubble columns equipped with porous sparger and investigates the effect of gas phase properties by conducting experiments with various gases (i.e., air, CO2, He) that cover a wide range of physical property values. The purpose is to investigate the validity of the design equations, which were proposed in our previous work and can predict with reasonable accuracy the transition point from homogeneous to heterogeneous regime as well as the gas holdup and the mean Sauter diameter at the homogeneous regime. Although, the correlations were checked with data obtained using different geometrical configurations and several Newtonian and non-Newtonian liquids, as well as the addition of surfactants, the gas phase was always atmospheric air. The new experiments revealed that only the use of low-density gas (He) has a measurable effect on bubble column performance. More precisely, when the low-density gas (He) is employed, the transition point shifts to higher gas flow rates and the gas holdup decreases, a fact attributed to the lower momentum force exerted by the gas. In view of the new data, the proposed correlations have been slightly modified to include the effect of gas phase properties and it is found that they can predict the aforementioned quantities with an accuracy of ±15%. It has been also proved that computational fluid dynamics (CFD) simulations are an accurate means for assessing the flow characteristics inside a bubble column. View Full-Text
Keywords: bubble column; porous sparger; holdup; bubble size; transition point; computational fluid dynamics bubble column; porous sparger; holdup; bubble size; transition point; computational fluid dynamics
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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. (CC BY 4.0).
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Kanaris, A.G.; Pavlidis, T.I.; Chatzidafni, A.P.; Mouza, A.A. The Effects of the Properties of Gases on the Design of Bubble Columns Equipped with a Fine Pore Sparger. ChemEngineering 2018, 2, 11.

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