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Computational fluid dynamics simulation of gas–solid hydrodynamics in a bubbling fluidized-bed reactor: effects of air distributor, viscous and drag models

In this work, we employed a computational fluid dynamics (CFD)-based model with a Eulerian multiphase approach to simulate the fluidization hydrodynamics in biomass gasification processes. Air was used as the gasifying/fluidizing agent and entered the gasifier at the bottom which subsequently fluidi...

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Main Authors:	Khezri, Ramin, Wan Ab. Karim Ghani, Wan Azlina, Soltani, Salman Masoudi, Awang Biak, Dayang Radiah, Yunus, Robiah, Silas, Kiman, Shahbaz, Muhammad, Motlagh, Shiva Rezaei
Format:	Article
Language:	English
Published:	MDPI 2019
Online Access:	http://psasir.upm.edu.my/id/eprint/38288/1/78288.pdf http://psasir.upm.edu.my/id/eprint/38288/ https://www.mdpi.com/2227-9717/7/8/524
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spelling	my.upm.eprints.382882020-05-04T16:12:17Z http://psasir.upm.edu.my/id/eprint/38288/ Computational fluid dynamics simulation of gas–solid hydrodynamics in a bubbling fluidized-bed reactor: effects of air distributor, viscous and drag models Khezri, Ramin Wan Ab. Karim Ghani, Wan Azlina Soltani, Salman Masoudi Awang Biak, Dayang Radiah Yunus, Robiah Silas, Kiman Shahbaz, Muhammad Motlagh, Shiva Rezaei In this work, we employed a computational fluid dynamics (CFD)-based model with a Eulerian multiphase approach to simulate the fluidization hydrodynamics in biomass gasification processes. Air was used as the gasifying/fluidizing agent and entered the gasifier at the bottom which subsequently fluidized the solid particles inside the reactor column. The momentum exchange related to the gas-phase was simulated by considering various viscous models (i.e., laminar and turbulence models of the re-normalisation group (RNG), k-ε and k-ω). The pressure drop gradient obtained by employing each viscous model was plotted for different superficial velocities and compared with the experimental data for validation. The turbulent model of RNG k-Ɛ was found to best represent the actual process. We also studied the effect of air distributor plates with different pore diameters (2, 3 and 5 mm) on the momentum of the fluidizing fluid. The plate with 3-mm pores showed larger turbulent viscosities above the surface. The effects of drag models (Syamlal–O’Brien, Gidaspow and energy minimum multi-scale method (EMMS) on the bed’s pressure drop as well as on the volume fractions of the solid particles were investigated. The Syamlal–O’Brien model was found to forecast bed pressure drops most consistently, with the pressure drops recorded throughout the experimental process. The formation of bubbles and their motion along the gasifier height in the presence of the turbulent flow was seen to follow a different pattern from with the laminar flow. MDPI 2019 Article PeerReviewed text en http://psasir.upm.edu.my/id/eprint/38288/1/78288.pdf Khezri, Ramin and Wan Ab. Karim Ghani, Wan Azlina and Soltani, Salman Masoudi and Awang Biak, Dayang Radiah and Yunus, Robiah and Silas, Kiman and Shahbaz, Muhammad and Motlagh, Shiva Rezaei (2019) Computational fluid dynamics simulation of gas–solid hydrodynamics in a bubbling fluidized-bed reactor: effects of air distributor, viscous and drag models. Processes, 7 (8). art. no. 524. pp. 1-16. ISSN 2227-9717 https://www.mdpi.com/2227-9717/7/8/524 10.3390/pr7080524
institution	Universiti Putra Malaysia
building	UPM Library
collection	Institutional Repository
continent	Asia
country	Malaysia
content_provider	Universiti Putra Malaysia
content_source	UPM Institutional Repository
url_provider	http://psasir.upm.edu.my/
language	English
description	In this work, we employed a computational fluid dynamics (CFD)-based model with a Eulerian multiphase approach to simulate the fluidization hydrodynamics in biomass gasification processes. Air was used as the gasifying/fluidizing agent and entered the gasifier at the bottom which subsequently fluidized the solid particles inside the reactor column. The momentum exchange related to the gas-phase was simulated by considering various viscous models (i.e., laminar and turbulence models of the re-normalisation group (RNG), k-ε and k-ω). The pressure drop gradient obtained by employing each viscous model was plotted for different superficial velocities and compared with the experimental data for validation. The turbulent model of RNG k-Ɛ was found to best represent the actual process. We also studied the effect of air distributor plates with different pore diameters (2, 3 and 5 mm) on the momentum of the fluidizing fluid. The plate with 3-mm pores showed larger turbulent viscosities above the surface. The effects of drag models (Syamlal–O’Brien, Gidaspow and energy minimum multi-scale method (EMMS) on the bed’s pressure drop as well as on the volume fractions of the solid particles were investigated. The Syamlal–O’Brien model was found to forecast bed pressure drops most consistently, with the pressure drops recorded throughout the experimental process. The formation of bubbles and their motion along the gasifier height in the presence of the turbulent flow was seen to follow a different pattern from with the laminar flow.
format	Article
author	Khezri, Ramin Wan Ab. Karim Ghani, Wan Azlina Soltani, Salman Masoudi Awang Biak, Dayang Radiah Yunus, Robiah Silas, Kiman Shahbaz, Muhammad Motlagh, Shiva Rezaei
spellingShingle	Khezri, Ramin Wan Ab. Karim Ghani, Wan Azlina Soltani, Salman Masoudi Awang Biak, Dayang Radiah Yunus, Robiah Silas, Kiman Shahbaz, Muhammad Motlagh, Shiva Rezaei Computational fluid dynamics simulation of gas–solid hydrodynamics in a bubbling fluidized-bed reactor: effects of air distributor, viscous and drag models
author_facet	Khezri, Ramin Wan Ab. Karim Ghani, Wan Azlina Soltani, Salman Masoudi Awang Biak, Dayang Radiah Yunus, Robiah Silas, Kiman Shahbaz, Muhammad Motlagh, Shiva Rezaei
author_sort	Khezri, Ramin
title	Computational fluid dynamics simulation of gas–solid hydrodynamics in a bubbling fluidized-bed reactor: effects of air distributor, viscous and drag models
title_short	Computational fluid dynamics simulation of gas–solid hydrodynamics in a bubbling fluidized-bed reactor: effects of air distributor, viscous and drag models
title_full	Computational fluid dynamics simulation of gas–solid hydrodynamics in a bubbling fluidized-bed reactor: effects of air distributor, viscous and drag models
title_fullStr	Computational fluid dynamics simulation of gas–solid hydrodynamics in a bubbling fluidized-bed reactor: effects of air distributor, viscous and drag models
title_full_unstemmed	Computational fluid dynamics simulation of gas–solid hydrodynamics in a bubbling fluidized-bed reactor: effects of air distributor, viscous and drag models
title_sort	computational fluid dynamics simulation of gas–solid hydrodynamics in a bubbling fluidized-bed reactor: effects of air distributor, viscous and drag models
publisher	MDPI
publishDate	2019
url	http://psasir.upm.edu.my/id/eprint/38288/1/78288.pdf http://psasir.upm.edu.my/id/eprint/38288/ https://www.mdpi.com/2227-9717/7/8/524
_version_	1665895971824861184
score	13.211869

Computational fluid dynamics simulation of gas–solid hydrodynamics in a bubbling fluidized-bed reactor: effects of air distributor, viscous and drag models

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