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Gas Flow Visualization in Low Aspect Ratio Packed Beds by Three-Dimensional Modeling and Near-Infrared Tomography
Univ Lancaster, Dept Engn, Lancaster LA1 4YW, England..
Univ Lancaster, Dept Engn, Lancaster LA1 4YW, England..
Queens Univ Belfast, Sch Chem & Chem Engn, Belfast BT7 1NN, Antrim, North Ireland..
Queens Univ Belfast, Sch Chem & Chem Engn, Belfast BT7 1NN, Antrim, North Ireland..
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2015 (English)In: Industrial & Engineering Chemistry Research, ISSN 0888-5885, E-ISSN 1520-5045, Vol. 54, no 51, 12714-12729 p.Article in journal (Refereed) Published
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Abstract [en]

Nonuniform local flow inside randomly porous media of gas solid packed beds of low aspect ratios ranging from 1.5 to 5 was investigated by three-dimensional modeling and near-infrared tomography. These beds are known to demonstrate heterogeneous mixing and uneven distributions of mass and heat. The effects of the confining wall on flow dynamics were found nonlinear, particularly for aspect ratios lower than 3. High velocities were mainly observed in regions near the wall of aspect ratio value of 1.5 and those of values higher than 3, owing to high local porosities in these zones. Mass dispersion characterized both by experimental near-infrared imaging and by particle tracking showed discrepancies with literature models, particularly for aspect ratios lower than 3. Uncertainties were more significant with the radial dispersion due to bed size limits. Beyond this value, the wall affected more the axial dispersion, confirming the nonlinear impact of the wall on global hydrodynamics.

Place, publisher, year, edition, pages
2015. Vol. 54, no 51, 12714-12729 p.
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Chemical Engineering
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URN: urn:nbn:se:uu:diva-275859DOI: 10.1021/acs.iecr.5b02635ISI: 000367702200002OAI: oai:DiVA.org:uu-275859DiVA: diva2:903584
Available from: 2016-02-16 Created: 2016-02-08 Last updated: 2017-11-30Bibliographically approved

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Fernandes, Daniel Luis Abreu

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