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Constructal design and optimisation of combined microchannels and micro pin fins for microelectronic cooling
Thesis (PhD)--University of Pretoria, 2016.
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| Format: | Thesis |
| Language: | English |
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University of Pretoria
2017
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| _version_ | 1867613576788705280 |
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| access_status_str | Open Access |
| author2 | Bello-Ochende, Tunde |
| author_browse | Bello-Ochende, Tunde |
| author_facet | Bello-Ochende, Tunde |
| collection | Thesis |
| dc_rights_str_mv | © 2017 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 | Thesis (PhD)--University of Pretoria, 2016. |
| format | Thesis |
| id | oai:repository.up.ac.za:2263/61305 |
| institution | University of Pretoria (South Africa) |
| language | English |
| last_indexed | 2026-06-10T12:38:21.029Z |
| license_str | Other — see source repository |
| provenance_str_mv | Harvested via OAI-PMH from UPSpace — University of Pretoria Institutional Repository |
| publishDate | 2017 |
| publishDateRange | 2017 |
| publishDateSort | 2017 |
| 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:2263/61305 Constructal design and optimisation of combined microchannels and micro pin fins for microelectronic cooling Bello-Ochende, Tunde u12217400@tuks.co.za Meyer, Josua P. Adewumi, Olayinka Omowunmi UCTD Microchannels Thermal conductance Thermal resistance Temperature variation Microchannels Micro pin fins Computational fluid dynamics Goal-driven optimisation Heat transfer Fluid flow Constructal theory Constraints Optimal heat sink Thermal resistance Temperature variation Engineering, built environment and information technology theses SDG-07 SDG-07: Affordable and clean energy Engineering, built environment and information technology theses SDG-09 SDG-09: Industry, innovation and infrastructure Engineering, built environment and information technology theses SDG-12 SDG-12: Responsible consumption and production Thesis (PhD)--University of Pretoria, 2016. Microchannels and micro pin fins have been employed for almost four decades in the cooling of microelectronic devices and research is still being done in this field to improve the thermal performance of these micro heat sinks. In this research, the constructal design and computational fluid dynamics code was used with a goal-driven optimisation tool to numerically investigate the thermal performance of a novel design of combining microchannels and micro pin fins for microelectronic cooling applications. Existing designs of microchannels were first optimised and thereafter, three to seven rows of micro pin fins were inserted into the microchannels to investigate whether there was further improvement in thermal performance. The microchannels and micro pin fins were both embedded in a highly conductive solid substrate. three-dimensional geometric structure of the combined micro heat sink was optimised to achieve the objective of maximised thermal conductance, which is also minimised thermal resistance under various design conditions. The micro heat sinks investigated in the study were the single microchannel, two-layered microchannels with parallel and counter flow configurations, three-layered microchannels with parallel and counter flow configurations, the single microchannel with circular-, square- and hexagonal-shaped micro pin-fin inserts and the two-layered microchannels with circular-shaped micro pin-fin inserts. A numerical computational fluid dynamics (CFD) package with a goal-driven optimisation tool, which employs the finite-volume method, was used to analyse the fluid flow and heat transfer in the micro heat sinks investigated in this work. The thermal performances of all the micro heat sinks were compared for different application scenarios. Furthermore, the temperature variation on the heated base of the solid substrate was studied for the different micro heat sinks to investigate which of the heat sink designs minimised the temperature rise on the heated base best. This is very important in microelectronic cooling applications because temperature rise affects the reliability of the device. The heat sink design that best maximised thermal conductance and minimised temperature rise on the heated base was chosen as the best for microelectronic cooling. For all the cases considered, fixed volume constraints and manufacturing constraints were applied to ensure real-life applicability. It was concluded that optimal heat sink design for different application scenarios could be obtained speedily when a CFD package which had an optimisation tool was used. mi2025 Mechanical and Aeronautical Engineering PhD Unrestricted SDG-07: Affordable and clean energy SDG-09: Industry, innovation and infrastructure SDG-12: Responsible consumption and production 2017-07-13T13:28:51Z 2017-07-13T13:28:51Z 2017-04-26 2016 Thesis Adewumi, OO 2016, Constructal design and optimisation of combined microchannels and micro pin fins for microelectronic cooling, PhD Thesis, University of Pretoria, Pretoria, viewed yymmdd <http://hdl.handle.net/2263/61305> A2017 http://hdl.handle.net/2263/61305 en © 2017 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 Microchannels Thermal conductance Thermal resistance Temperature variation Microchannels Micro pin fins Computational fluid dynamics Goal-driven optimisation Heat transfer Fluid flow Constructal theory Constraints Optimal heat sink Thermal resistance Temperature variation Engineering, built environment and information technology theses SDG-07 SDG-07: Affordable and clean energy Engineering, built environment and information technology theses SDG-09 SDG-09: Industry, innovation and infrastructure Engineering, built environment and information technology theses SDG-12 SDG-12: Responsible consumption and production Constructal design and optimisation of combined microchannels and micro pin fins for microelectronic cooling |
| title | Constructal design and optimisation of combined microchannels and micro pin fins for microelectronic cooling |
| title_full | Constructal design and optimisation of combined microchannels and micro pin fins for microelectronic cooling |
| title_fullStr | Constructal design and optimisation of combined microchannels and micro pin fins for microelectronic cooling |
| title_full_unstemmed | Constructal design and optimisation of combined microchannels and micro pin fins for microelectronic cooling |
| title_short | Constructal design and optimisation of combined microchannels and micro pin fins for microelectronic cooling |
| title_sort | constructal design and optimisation of combined microchannels and micro pin fins for microelectronic cooling |
| topic | UCTD Microchannels Thermal conductance Thermal resistance Temperature variation Microchannels Micro pin fins Computational fluid dynamics Goal-driven optimisation Heat transfer Fluid flow Constructal theory Constraints Optimal heat sink Thermal resistance Temperature variation Engineering, built environment and information technology theses SDG-07 SDG-07: Affordable and clean energy Engineering, built environment and information technology theses SDG-09 SDG-09: Industry, innovation and infrastructure Engineering, built environment and information technology theses SDG-12 SDG-12: Responsible consumption and production |
| url | http://hdl.handle.net/2263/61305 |