CFD Simulation on the Hydrodynamics in Gas-Liquid Airlift Reactor

Two-fluid model approach to simulate gas-liquid airlift reactors is widely implemented but have yet to reach a consensus on the closure model to account the gas-liquid interphase forces. Proper selection of a closure model is required in order to accurately capture the hydrodynamics in the complex o...

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Main Authors: Shi, Yan Liew, Jolius, Gimbun
Format: Article
Language:English
Published: Walter de Gruyter GmbH 2017
Subjects:
Online Access:http://umpir.ump.edu.my/id/eprint/19658/
http://umpir.ump.edu.my/id/eprint/19658/
http://umpir.ump.edu.my/id/eprint/19658/
http://umpir.ump.edu.my/id/eprint/19658/1/cfd%20simulation-jolius-fkksa-2017.pdf
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spelling ump-196582018-01-12T03:07:53Z http://umpir.ump.edu.my/id/eprint/19658/ CFD Simulation on the Hydrodynamics in Gas-Liquid Airlift Reactor Shi, Yan Liew Jolius, Gimbun TP Chemical technology Two-fluid model approach to simulate gas-liquid airlift reactors is widely implemented but have yet to reach a consensus on the closure model to account the gas-liquid interphase forces. Proper selection of a closure model is required in order to accurately capture the hydrodynamics in the complex of the two-phase system. Our work concerns the evaluation of the interfacial forces models (i. e. drag, lift and turbulent dispersion force) and their effects on local gas holdup and liquid velocity. A transient three-dimensional airlift reactor simulation was carried out using computational fluid dynamics by implementing the dispersed standard k-ϵ turbulence model. Four drag models governed by spherical bubble, bubble deformation and Rayleigh-Taylor were being evaluated in our work. The significance on the inclusion of the lift model on predictive accuracy on the flow field was also studied as well. Whereas, two turbulent dispersion force models were selected to evaluate on their performance in improving the predictive accuracy of the local hydrodynamics. Results showed that the drag governed by Rayleigh-Taylor which accounts the bubble swarm effect had better predictions on the gas holdup in the downcomer and improved predictions in radial gas holdup. The inclusion of the lift model improved local gas holdup predictions at higher heights of the reactor and shifted the bubble plume towards the centre region of the riser. Meanwhile, the turbulent dispersion models improved the overall results of predicted local gas holdup with closer agreement obtained when the drift velocity model was considered in the simulation. The axial liquid velocity was well predicted for all cases. The consideration of the drag, lift and turbulent dispersion forces resulted in a closer agreement with experimental data. © 2017 Walter de Gruyter GmbH, Berlin/Boston 2017. Walter de Gruyter GmbH 2017-08-03 Article PeerReviewed application/pdf en http://umpir.ump.edu.my/id/eprint/19658/1/cfd%20simulation-jolius-fkksa-2017.pdf Shi, Yan Liew and Jolius, Gimbun (2017) CFD Simulation on the Hydrodynamics in Gas-Liquid Airlift Reactor. Chemical Product and Process Modeling, 12 (4). pp. 1-11. ISSN 1934-2659 https://doi.org/10.1515/cppm-2017-0030 doi: 10.1515/cppm-2017-0030
repository_type Digital Repository
institution_category Local University
institution Universiti Malaysia Pahang
building UMP Institutional Repository
collection Online Access
language English
topic TP Chemical technology
spellingShingle TP Chemical technology
Shi, Yan Liew
Jolius, Gimbun
CFD Simulation on the Hydrodynamics in Gas-Liquid Airlift Reactor
description Two-fluid model approach to simulate gas-liquid airlift reactors is widely implemented but have yet to reach a consensus on the closure model to account the gas-liquid interphase forces. Proper selection of a closure model is required in order to accurately capture the hydrodynamics in the complex of the two-phase system. Our work concerns the evaluation of the interfacial forces models (i. e. drag, lift and turbulent dispersion force) and their effects on local gas holdup and liquid velocity. A transient three-dimensional airlift reactor simulation was carried out using computational fluid dynamics by implementing the dispersed standard k-ϵ turbulence model. Four drag models governed by spherical bubble, bubble deformation and Rayleigh-Taylor were being evaluated in our work. The significance on the inclusion of the lift model on predictive accuracy on the flow field was also studied as well. Whereas, two turbulent dispersion force models were selected to evaluate on their performance in improving the predictive accuracy of the local hydrodynamics. Results showed that the drag governed by Rayleigh-Taylor which accounts the bubble swarm effect had better predictions on the gas holdup in the downcomer and improved predictions in radial gas holdup. The inclusion of the lift model improved local gas holdup predictions at higher heights of the reactor and shifted the bubble plume towards the centre region of the riser. Meanwhile, the turbulent dispersion models improved the overall results of predicted local gas holdup with closer agreement obtained when the drift velocity model was considered in the simulation. The axial liquid velocity was well predicted for all cases. The consideration of the drag, lift and turbulent dispersion forces resulted in a closer agreement with experimental data. © 2017 Walter de Gruyter GmbH, Berlin/Boston 2017.
format Article
author Shi, Yan Liew
Jolius, Gimbun
author_facet Shi, Yan Liew
Jolius, Gimbun
author_sort Shi, Yan Liew
title CFD Simulation on the Hydrodynamics in Gas-Liquid Airlift Reactor
title_short CFD Simulation on the Hydrodynamics in Gas-Liquid Airlift Reactor
title_full CFD Simulation on the Hydrodynamics in Gas-Liquid Airlift Reactor
title_fullStr CFD Simulation on the Hydrodynamics in Gas-Liquid Airlift Reactor
title_full_unstemmed CFD Simulation on the Hydrodynamics in Gas-Liquid Airlift Reactor
title_sort cfd simulation on the hydrodynamics in gas-liquid airlift reactor
publisher Walter de Gruyter GmbH
publishDate 2017
url http://umpir.ump.edu.my/id/eprint/19658/
http://umpir.ump.edu.my/id/eprint/19658/
http://umpir.ump.edu.my/id/eprint/19658/
http://umpir.ump.edu.my/id/eprint/19658/1/cfd%20simulation-jolius-fkksa-2017.pdf
first_indexed 2023-09-18T22:28:08Z
last_indexed 2023-09-18T22:28:08Z
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