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Modelling the flow behaviour of gas bubbles in a bubble column
Includes abstract.
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| Other Authors: | |
| Format: | Thesis |
| Language: | English |
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Centre for Bioprocess Engineering Research
2014
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| _version_ | 1867613388889128960 |
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| access_status_str | Open Access |
| author | McMahon, Andrew Martin |
| author2 | Rawatlal, Randhir |
| author_browse | McMahon, Andrew Martin Rawatlal, Randhir |
| author_facet | Rawatlal, Randhir McMahon, Andrew Martin |
| author_sort | McMahon, Andrew Martin |
| collection | Thesis |
| description | Includes abstract. |
| format | Thesis |
| id | oai:open.uct.ac.za:11427/5441 |
| institution | University of Cape Town (South Africa) |
| language | eng |
| last_indexed | 2026-06-10T12:35:21.959Z |
| license_str | Not specified — see source repository |
| provenance_str_mv | Harvested via OAI-PMH from UCTD — University of Cape Town Open Access Repository |
| publishDate | 2014 |
| publishDateRange | 2014 |
| publishDateSort | 2014 |
| publisher | Centre for Bioprocess Engineering Research |
| publisherStr | Centre for Bioprocess Engineering Research |
| record_format | dspace |
| source_str | UCTD — University of Cape Town Open Access Repository |
| spelling | oai:open.uct.ac.za:11427/5441 Modelling the flow behaviour of gas bubbles in a bubble column McMahon, Andrew Martin Rawatlal, Randhir Harrison, STL Chinyoka, Tiri Bioprocess Engineering Includes abstract. Includes bibliographical references (leaves 96-99). The bubble column reactor is commonly used in industry, although the fluid dynamics inside are not well understood. The challenges associated with solving multi phase flow problems arise from the complexity of the governing equations which have to be solved, which are typically mass, momentum and energy balances. These time-dependent problems need to include effects of turbulence and are computationally expensive when simulating the hydrodynamics of large bubble columns. In an attempt to reduce the computational expense in solving bubble column reactor models, a "cell" model is proposed which predicts the velocity flow field in the vicinity of a single spherical bubble. It is intended that this model would form the fundamental building block in a macroscale model framework that does predict the flow of multiple bubbles in the whole column. The non-linear Navier-Stokes (NVS) equations are used to model fluid flow around the bubble. This study focusses on the Reynolds number range where the linear Stokes equations can be used to accurately predict the flow around the bubble. The Stokes equations are mathematically easier to solve than the NVS equations and are thus less computationally expensive. The validity of the NVS model was tested against experimental data for the flow of water around a solid sphere and was found to be in close agreement for the Reynolds number range 25 to 80. The simulation results from the Stokes flow model were compared with those from the NVS flow model and were similar at Reynolds numbers below 1. The application is then in the partitioning of the bubble column into regions governed by either Stokes or NVS equations. 2014-07-31T11:16:37Z 2014-07-31T11:16:37Z 2009 Master Thesis Masters MSc http://hdl.handle.net/11427/5441 eng application/pdf Centre for Bioprocess Engineering Research Faculty of Engineering and the Built Environment University of Cape Town |
| spellingShingle | Bioprocess Engineering McMahon, Andrew Martin Modelling the flow behaviour of gas bubbles in a bubble column |
| thesis_degree_str | Master's |
| title | Modelling the flow behaviour of gas bubbles in a bubble column |
| title_full | Modelling the flow behaviour of gas bubbles in a bubble column |
| title_fullStr | Modelling the flow behaviour of gas bubbles in a bubble column |
| title_full_unstemmed | Modelling the flow behaviour of gas bubbles in a bubble column |
| title_short | Modelling the flow behaviour of gas bubbles in a bubble column |
| title_sort | modelling the flow behaviour of gas bubbles in a bubble column |
| topic | Bioprocess Engineering |
| url | http://hdl.handle.net/11427/5441 |
| work_keys_str_mv | AT mcmahonandrewmartin modellingtheflowbehaviourofgasbubblesinabubblecolumn |