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Cavity natural convection of zinc oxide-water nanofluid - experimental work
Dissertation (MEng)--University of Pretoria, 2015.
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| Format: | Thesis |
| Language: | English |
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University of Pretoria
2016
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| _version_ | 1867613581563920384 |
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| access_status_str | Open Access |
| author2 | Sharifpur, Mohsen |
| author_browse | Sharifpur, Mohsen |
| author_facet | Sharifpur, Mohsen |
| collection | Thesis |
| dc_rights_str_mv | © 2016 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)--University of Pretoria, 2015. |
| format | Thesis |
| id | oai:repository.up.ac.za:2263/57488 |
| institution | University of Pretoria (South Africa) |
| language | English |
| last_indexed | 2026-06-10T12:38:25.653Z |
| license_str | Other — see source repository |
| provenance_str_mv | Harvested via OAI-PMH from UPSpace — University of Pretoria Institutional Repository |
| publishDate | 2016 |
| publishDateRange | 2016 |
| publishDateSort | 2016 |
| 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:2263/57488 Cavity natural convection of zinc oxide-water nanofluid - experimental work Sharifpur, Mohsen u28238746@tuks.co.za Meyer, Josua P. Lee, Kyoung-Yeoll UCTD Nanofluids Natural convection Thermophysical properties of nanofluids experimental ZnO Cavity flow 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 Dissertation (MEng)--University of Pretoria, 2015. Nanofluids show great potential for conventional heat transfer fluids that could benefit industries and save huge costs. Nanofluids are well known for enormously enhancing the thermal conductivity of a base fluid. However, there is a lack of consensus in experimental and numerical results for the natural convection heat transfer of nanofluids in a closed cavity. In this study, the cavity flow natural convection of zinc oxide (ZnO)-water is investigated experimentally. The ZnO nanoparticles have an average size of 20 nm and the nanofluids were prepared with different volume fractions of 0.09, 0.18, 0.36, 0.5 and 1 volume percentage (vol.%) (0.5, 1, 2, 3 and 5.67 weight percentage). The stability of the ZnO nanofluid is verified using a spectrophotometer and zeta potential measurement at various temperatures and concentrations of the nanofluids. Zeta potential values are measured within the stable range, and no sedimentation of nanoparticles is indicated within 24 hours. The viscosity of ZnO-water nanofluid is also measured experimentally, which is 20% higher than the use of the traditional Einstein viscosity model at 1 vol.%. The heat transfer efficiency of natural convection of ZnO-water nanofluid is examined experimentally in a closed square cavity at a Rayleigh number (Ra) range between 7.9E+7 and 8.9E+8. The cavity is heated vertically from one vertical wall and cooled from the opposite wall. Other sides, including top and bottom walls, are insulated to be adiabatic. Consequently, the suspension of ZnO nanoparticles in water does not enhance the natural convection heat transfer coefficient. The systematic deterioration of the natural convection heat transfer coefficient is observed as increasing in the concentration of nanoparticles. tm2016 mi2025 Mechanical and Aeronautical Engineering MEng Unrestricted SDG-07: Affordable and clean energy SDG-09: Industry, innovation and infrastructure SDG-12: Responsible consumption and production 2016-10-27T07:28:32Z 2016-10-27T07:28:32Z 2016-09-01 2015 Dissertation Lee, K 2015, Cavity natural convection of zinc oxide-water nanofluid - experimental work, MEng Dissertation, University of Pretoria, Pretoria, viewed yymmdd <http://hdl.handle.net/2263/57488> S2016 http://hdl.handle.net/2263/57488 en © 2016 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 Nanofluids Natural convection Thermophysical properties of nanofluids experimental ZnO Cavity flow 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 Cavity natural convection of zinc oxide-water nanofluid - experimental work |
| title | Cavity natural convection of zinc oxide-water nanofluid - experimental work |
| title_full | Cavity natural convection of zinc oxide-water nanofluid - experimental work |
| title_fullStr | Cavity natural convection of zinc oxide-water nanofluid - experimental work |
| title_full_unstemmed | Cavity natural convection of zinc oxide-water nanofluid - experimental work |
| title_short | Cavity natural convection of zinc oxide-water nanofluid - experimental work |
| title_sort | cavity natural convection of zinc oxide water nanofluid experimental work |
| topic | UCTD Nanofluids Natural convection Thermophysical properties of nanofluids experimental ZnO Cavity flow 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/2263/57488 |