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 language | English |
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Title of host publication | Proceedings of the 11th International Conference on Conveying and Handling of Particulate Solids |
Editors | Jin Ooi, John P. Morrissey, Kevin Hanley, Stefanos-Aldo Papanicolopulos |
Place of Publication | Edinburgh |
Publisher | Zenodo |
Pages | 57-58 |
Number of pages | 2 |
ISBN (Print) | 9781036903640 |
DOIs | |
Publication status | Published - 4 Nov 2024 |
Event | 11th International Conference on Conveying and Handling of Particulate Solids - Edinburgh International Conference Centre (EICC), Edinburgh, United Kingdom Duration: 2 Sept 2024 → 4 Sept 2024 https://www.chops2024.ed.ac.uk/ (Link to conference website) |
Publication series
Name | |
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ISSN (Print) | None |
Conference
Conference | 11th International Conference on Conveying and Handling of Particulate Solids |
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Abbreviated title | CHoPS 2024 |
Country/Territory | United Kingdom |
City | Edinburgh |
Period | 2/09/24 → 4/09/24 |
Internet address |
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Keywords
- granular temperature
- pseudo-3D