A robust indicator for the dense to dilute phase transition under horizontal moving bed flow during Fluidized Dense phase Conveying of Geldart A powders by Eulerian modelling

Prabu Balasubramanian*, Andrew Cowell, Don McGlinchey

*Corresponding author for this work

Research output: Chapter in Book/Report/Conference proceedingConference contribution

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Abstract

Fluidized dense phase conveying of fine powders typically operates at high solids flux, 1000 – 3000 kg/m2s. The predominantly horizontal flow is characterised by a moving bed of solids at the bottom of the pipe cross-section coexisting with dilute phase flow at the top. Superficial gas velocity in the feed zone is typically 3-4 m/s at a pressure of up to 4 bar, increasing to 9-12 m/s at the ambient receiver, as the air expands along the conveying pipeline for the incurred pressure drop. If and where along the pipeline the flow transitions to dilute phase is significant for system design and there is no reliable macroscopic indicator. Eulerian modelling with the Granular Kinetic Theory suggests that the granular temperature at the dense bottom is 3-4 orders of magnitude lower than that at the dilute top, getting gradually uniform across the pipe cross-section towards the ambient receiver, as the moving bed gets suspended. With measurement techniques emerging for granular temperature, it may offer a reliable indicator for the transition. Besides a long pipe 3D model, this study has utilized a ‘pseudo-3D’, axially periodic 3D model with a single layer of axial cells (disk), to study the gradients in the radial and azimuthal directions by highly resolved simulations.
Original languageEnglish
Title of host publicationProceedings of the 11th International Conference on Conveying and Handling of Particulate Solids
EditorsJin Ooi, John P. Morrissey, Kevin Hanley, Stefanos-Aldo Papanicolopulos
Place of PublicationEdinburgh
PublisherZenodo
Pages57-58
Number of pages2
ISBN (Print)9781036903640
DOIs
Publication statusPublished - 4 Nov 2024
Event11th International Conference on Conveying and Handling of Particulate Solids - Edinburgh International Conference Centre (EICC), Edinburgh, United Kingdom
Duration: 2 Sept 20244 Sept 2024
https://www.chops2024.ed.ac.uk/ (Link to conference website)

Publication series

Name
ISSN (Print)None

Conference

Conference11th International Conference on Conveying and Handling of Particulate Solids
Abbreviated titleCHoPS 2024
Country/TerritoryUnited Kingdom
CityEdinburgh
Period2/09/244/09/24
Internet address

Keywords

  • granular temperature
  • pseudo-3D

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