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Enhancement of flow boiling by the introduction of delta winglet vortex generators
Dissertation (MEng (Mechanical Engineering))--University of Pretoria, 2026.
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| Format: | Thesis |
| Language: | English |
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University of Pretoria
2026
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| _version_ | 1869483894330359808 |
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| access_status_str | Open Access |
| author2 | Craig, K.J. (Kenneth) |
| author_browse | Craig, K.J. (Kenneth) |
| author_facet | Craig, K.J. (Kenneth) |
| collection | Thesis |
| dc_rights_str_mv | © 2024 University of Pretoria. All rights reserved. The copyright in this work vests in the University of Pretoria. No part of this work may be reproduced or transmitted in any form or by any means, without the prior written permission of the University of Pretoria. |
| description | Dissertation (MEng (Mechanical Engineering))--University of Pretoria, 2026. |
| format | Thesis |
| id | oai:repository.up.ac.za:2263/108389 |
| institution | University of Pretoria (South Africa) |
| language | English |
| last_indexed | 2026-07-01T04:06:14.958Z |
| license_str | Other — see source repository |
| provenance_str_mv | Harvested via OAI-PMH from UPSpace — University of Pretoria Institutional Repository |
| publishDate | 2026 |
| publishDateRange | 2026 |
| publishDateSort | 2026 |
| publisher | University of Pretoria |
| publisherStr | University of Pretoria |
| record_format | dspace |
| source_str | UPSpace — University of Pretoria Institutional Repository |
| spelling | oai:repository.up.ac.za:2263/108389 Enhancement of flow boiling by the introduction of delta winglet vortex generators Craig, K.J. (Kenneth) u17084441@tuks.co.za Valluri, Prashant le Roux, Francois Petrus Jacobus UCTD Sustainable Development Goals (SDGs) Vortex Generators Flow Boiling RPI Boiling Computational Fluid Dynamics Heat Transfer Dissertation (MEng (Mechanical Engineering))--University of Pretoria, 2026. Thermal management has been a field of great interest for many years, and is expected to become even more relevant in the coming years, especially with the expansion of computing resources. Phase-changing methods like boiling are identified as a particularly efficient means of removing heat from a surface. This research proposes a simulated investigation into a novel flow boiling enhancement, using delta winglets to produce vortices, to advance the existing cooling methods even more. The simulation is to be conducted in Ansys Fluent. A study of the existing solutions reveal that there is a need for enhanced heat removal methods. Additionally, the study shows that the proposed novel method has not been investigated before, presenting an opportunity for new insight. A literature study is conducted on the fields of boiling and vortex generators, focusing on pool boiling, flow boiling, microchannel flow boiling, longitudinal vortex generators, vortex bursting and enhancements used in flow boiling. From the literature we identify suitable experimental work to use as validation cases for our simulations. Three validation cases are selected.Each validation case is briefly summarised and then simulated. An element of our novel investigation is present in each validation case. The first validation case contains delta winglets, longitudinal vortices and heat transfer. The second validation case contain microchannels and heat transfer. The third validation case contains boiling, via the RPI boiling model, and heat transfer. For each validation case post-processing techniques were developed that we used in the novel investigation. We also showed how our simulation results were within experimental range, and thereby qualified as a validation.For our novel investigation we combined key concepts from the three validation cases into a single simulation, i.e. a delta winglet within a microchannel with flow boiling. We made use of the RPI boiling model to simulate and determine the heat transfer rates. The results of the novel investigation appear promising. Although having a high boiling incipience temperature, the gradient of the boiling curve exceeds that of the validation case.Further study and an accompanying experimental investigation is recommended as future work. A parametric study involving the existing geometric layout and simulation settings would also be able to reveal additional insight into the behaviour of the system. ThermaSMART Mechanical and Aeronautical Engineering MEng (Mechanical Engineering) Unrestricted Faculty of Engineering, Built Environment and Information Technology SDG-07: Affordable and clean energy 2026-02-18T12:40:19Z 2026-02-18T12:40:19Z 2026 2026-02-01 Dissertation * A2026 http://hdl.handle.net/2263/108389 https://doi.org/10.25403/UPresearchdata.31354741 en © 2024 University of Pretoria. All rights reserved. The copyright in this work vests in the University of Pretoria. No part of this work may be reproduced or transmitted in any form or by any means, without the prior written permission of the University of Pretoria. application/pdf University of Pretoria |
| spellingShingle | UCTD Sustainable Development Goals (SDGs) Vortex Generators Flow Boiling RPI Boiling Computational Fluid Dynamics Heat Transfer Enhancement of flow boiling by the introduction of delta winglet vortex generators |
| title | Enhancement of flow boiling by the introduction of delta winglet vortex generators |
| title_full | Enhancement of flow boiling by the introduction of delta winglet vortex generators |
| title_fullStr | Enhancement of flow boiling by the introduction of delta winglet vortex generators |
| title_full_unstemmed | Enhancement of flow boiling by the introduction of delta winglet vortex generators |
| title_short | Enhancement of flow boiling by the introduction of delta winglet vortex generators |
| title_sort | enhancement of flow boiling by the introduction of delta winglet vortex generators |
| topic | UCTD Sustainable Development Goals (SDGs) Vortex Generators Flow Boiling RPI Boiling Computational Fluid Dynamics Heat Transfer |
| url | http://hdl.handle.net/2263/108389 https://doi.org/10.25403/UPresearchdata.31354741 |