A CFD-DEM study of single bubble formation in gas fluidization of spherical and non-spherical particles

Siddhartha Shrestha, Zongyan Zhou

Research output: Chapter in Book/Report/Conference proceedingConference PaperResearchpeer-review

Abstract

Bubble dynamics significantly affect the hydrodynamics of gas-solid fluidized bed since they influence the gas-solid mixing. In this study, simulations using CFD-DEM were carried out to characterize the bubble size and shape for a bubble formed at a single orifice in gas-solid fluidized bed. Impact of parameters such as jet velocity, orifice size and particle shape on bubble equivalent diameter and bubble aspect ratio were analysed and discussed. Bubble equivalent diameter was found to increase with increasing jet velocity, decreasing bed width to orifice width ratio, and particle shape deviating from spherical. The bubble shape illustrated by aspect ratio, was found to elongate more as it rise through the bed and then commence to expand horizontally after it was detached from the orifice. Aspect ratio was found to be closer to a circle for the bubble at higher jet velocity, lower orifice width to bed ratio and for non-spherical particles.

Original languageEnglish
Title of host publicationEPJ Web of Conferences
Subtitle of host publicationPowders and Grains 2017 – 8th International Conference on Micromechanics on Granular Media
EditorsFarhang Radjai, Saeid Nezamabadi, Stefan Luding, Jean-Yves Delenne
Place of PublicationLes Ulis France
PublisherEDP Sciences
Number of pages4
Volume140
DOIs
Publication statusPublished - 30 Jun 2017
EventPowders and Grains 2017 - Montpellier, France
Duration: 3 Jul 20177 Jul 2017
Conference number: 8th
http://pg2017.org/en/

Publication series

NameEPJ Web of Conferences
PublisherEDP Sciences
Volume140
ISSN (Electronic)2100-014X

Conference

ConferencePowders and Grains 2017
CountryFrance
CityMontpellier
Period3/07/177/07/17
Internet address

Cite this

Shrestha, S., & Zhou, Z. (2017). A CFD-DEM study of single bubble formation in gas fluidization of spherical and non-spherical particles. In F. Radjai, S. Nezamabadi, S. Luding, & J-Y. Delenne (Eds.), EPJ Web of Conferences: Powders and Grains 2017 – 8th International Conference on Micromechanics on Granular Media (Vol. 140). [15026] (EPJ Web of Conferences; Vol. 140). Les Ulis France: EDP Sciences. EPJ Web of Conferences https://doi.org/10.1051/epjconf/201714015026
Shrestha, Siddhartha ; Zhou, Zongyan. / A CFD-DEM study of single bubble formation in gas fluidization of spherical and non-spherical particles. EPJ Web of Conferences: Powders and Grains 2017 – 8th International Conference on Micromechanics on Granular Media. editor / Farhang Radjai ; Saeid Nezamabadi ; Stefan Luding ; Jean-Yves Delenne. Vol. 140 Les Ulis France : EDP Sciences, 2017. (EPJ Web of Conferences). (EPJ Web of Conferences).
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Shrestha, S & Zhou, Z 2017, A CFD-DEM study of single bubble formation in gas fluidization of spherical and non-spherical particles. in F Radjai, S Nezamabadi, S Luding & J-Y Delenne (eds), EPJ Web of Conferences: Powders and Grains 2017 – 8th International Conference on Micromechanics on Granular Media. vol. 140, 15026, EPJ Web of Conferences, vol. 140, EDP Sciences, Les Ulis France, EPJ Web of Conferences, Powders and Grains 2017, Montpellier, France, 3/07/17. https://doi.org/10.1051/epjconf/201714015026

A CFD-DEM study of single bubble formation in gas fluidization of spherical and non-spherical particles. / Shrestha, Siddhartha; Zhou, Zongyan.

EPJ Web of Conferences: Powders and Grains 2017 – 8th International Conference on Micromechanics on Granular Media. ed. / Farhang Radjai; Saeid Nezamabadi; Stefan Luding; Jean-Yves Delenne. Vol. 140 Les Ulis France : EDP Sciences, 2017. 15026 (EPJ Web of Conferences; Vol. 140).

Research output: Chapter in Book/Report/Conference proceedingConference PaperResearchpeer-review

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Shrestha S, Zhou Z. A CFD-DEM study of single bubble formation in gas fluidization of spherical and non-spherical particles. In Radjai F, Nezamabadi S, Luding S, Delenne J-Y, editors, EPJ Web of Conferences: Powders and Grains 2017 – 8th International Conference on Micromechanics on Granular Media. Vol. 140. Les Ulis France: EDP Sciences. 2017. 15026. (EPJ Web of Conferences). (EPJ Web of Conferences). https://doi.org/10.1051/epjconf/201714015026