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Experimental investigation and model development for the thermal conductivity of glycerol-based nanofluids
Dissertation (MSc)--University of Pretoria, 2016.
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| Format: | Thesis |
| Language: | English |
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University of Pretoria
2016
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| _version_ | 1867613617811095552 |
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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 (MSc)--University of Pretoria, 2016. |
| format | Thesis |
| id | oai:repository.up.ac.za:2263/56115 |
| institution | University of Pretoria (South Africa) |
| language | English |
| last_indexed | 2026-06-10T12:39:00.149Z |
| 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:2263/56115 Experimental investigation and model development for the thermal conductivity of glycerol-based nanofluids Sharifpur, Mohsen deddytshim@yahoo.fr Meyer, Josua P. Tshimanga, Ntumba UCTD Nanofluids Thermal conductivity Glycerol Nanoparticle size Volume fraction Temperature Stability 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 (MSc)--University of Pretoria, 2016. Glycerol has historically been used as an antifreeze fluid to facilitate heat transfer in the automotive and air conditioning and refrigeration industries. It has also been used as a lubricant in the processing of food and the production of pharmaceuticals and cosmetics. Although a lot of work has been done recently to evaluate the potential to enhance heat transfer using nanoparticles mixed with a base fluid to form a nanofluid, no work has been done on using glycerol as a base fluid. Therefore the purpose of this study was to investigate the effect of nanoparticle volume fraction, nanoparticle size and temperature on the thermal conductivity of stable glycerol-based nanofluids. Two types of metal oxide nanoparticles were considered namely MgO and ?-Al2O3. The particle sizes of the MgO ranged from 21 nm to 119 nm and for the ?-Al2O3 it ranged from 31 nm to 134 nm. The thermal conductivities were determined by experimental measurements and with analytical and empirical models. The thermal conductivity measurements were taken at temperatures ranging from 20?C to 45?C, for nanofluids prepared at volume fractions ranging from 0.5% to 4%. The nanofluids were prepared with a two-step method that included ultrasound mixing to ensure the nanoparticles were fully dispersed and deagglomerated in the glycerol. The experimental results showed that both the ?-Al2O3-glycerol and MgO-glycerol nanofluids had substantially higher thermal conductivity than the base fluid. It was also found that at room temperature, the effective thermal conductivity remains almost constant for at least 50 hours. The maximum thermal conductivity enhancement for the ?-Al2O3-glycerol nanofluids was observed for a 4% volume fraction to be 19.5% for a nanoparticle size of 31 nm. For the MgO-glycerol nanofluids the maximum thermal conductivity enhancements were also for a volume fraction of 4%, however, the enhancement was 18% for a particle size of 21 nm. Furthermore, the thermal conductivities as function of nanoparticle size, volume fraction and temperature, of the two nanofluids were investigated. It was found that the thermal conductivities of the ?-Al2O3-glycerol nanofluids were significantly more dependent on particle size than the MgO-glycerol nanofluids. Furthermore, it was found that no equations exist at present that can accurately predict the thermal conductivity of glycerol based nanofluids and therefore new empirical equations correlations were developed. tm2016 mi2025 mi2025 Mechanical and Aeronautical Engineering MSc Unrestricted SDG-07: Affordable and clean energy SDG-09: Industry, innovation and infrastructure SDG-12: Responsible consumption and production 2016-07-29T11:02:11Z 2016-07-29T11:02:11Z 2016-04-15 2016 Dissertation Tshimanga, N 2016, Experimental investigation and model development for the thermal conductivity of glycerol-based nanofluids, MSc Dissertation, University of Pretoria, Pretoria, viewed yymmdd <http://hdl.handle.net/2263/56115> A2016 http://hdl.handle.net/2263/56115 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 Thermal conductivity Glycerol Nanoparticle size Volume fraction Temperature Stability 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 Experimental investigation and model development for the thermal conductivity of glycerol-based nanofluids |
| title | Experimental investigation and model development for the thermal conductivity of glycerol-based nanofluids |
| title_full | Experimental investigation and model development for the thermal conductivity of glycerol-based nanofluids |
| title_fullStr | Experimental investigation and model development for the thermal conductivity of glycerol-based nanofluids |
| title_full_unstemmed | Experimental investigation and model development for the thermal conductivity of glycerol-based nanofluids |
| title_short | Experimental investigation and model development for the thermal conductivity of glycerol-based nanofluids |
| title_sort | experimental investigation and model development for the thermal conductivity of glycerol based nanofluids |
| topic | UCTD Nanofluids Thermal conductivity Glycerol Nanoparticle size Volume fraction Temperature Stability 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/2263/56115 |