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Intriguingly high thermal conductivity increment for CuO nanowires contained nanofluids with low viscosity
Nanofluids offer the exciting new possibilities to enhance heat transfer performance. In this paper, experimental and theoretical investigations have been conducted to determine the effect of CuO nanowires on the thermal conductivity and viscosity of dimethicone based nanofluids. The CuO nanowires w...
Autores principales: | , , , |
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Formato: | Online Artículo Texto |
Lenguaje: | English |
Publicado: |
Nature Publishing Group UK
2018
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Materias: | |
Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5869596/ https://www.ncbi.nlm.nih.gov/pubmed/29588467 http://dx.doi.org/10.1038/s41598-018-23174-z |
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author | Zhu, Dahai Wang, Lingling Yu, Wei Xie, Huaqing |
author_facet | Zhu, Dahai Wang, Lingling Yu, Wei Xie, Huaqing |
author_sort | Zhu, Dahai |
collection | PubMed |
description | Nanofluids offer the exciting new possibilities to enhance heat transfer performance. In this paper, experimental and theoretical investigations have been conducted to determine the effect of CuO nanowires on the thermal conductivity and viscosity of dimethicone based nanofluids. The CuO nanowires were prepared through a thermal oxidation method, and the analysis indicated that the as-prepared CuO nanowires had high purity, monocrystalline with a monoclinic structure and large aspect ratio compared to CuO nanospheres. The experimental data show that the thermal conductivity of the nanofluids increases with the volume fraction of CuO nanowires or nanospheres, with a nearly linear relationship. For the nanofluid with the addition of 0.75 vol.% CuO nanowires, the thermal conductivity enhancement is up to 60.78%, which is much higher than that with spherical CuO nanoparticles. The nanofluids exhibit typical Newtonian behavior, and the measured viscosity of CuO nanowires contained nanofluids were found only 6.41% increment at the volume fraction of 0.75%. It is attractive in enhanced heat transfer for application. The thermal conductivity and viscosity of CuO nanofluids were further calculated and discussed by comparing our experimental results with the classic theoretical models. The mechanisms of thermal conductivity and viscosity about nanofluids were also discussed in detail. |
format | Online Article Text |
id | pubmed-5869596 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2018 |
publisher | Nature Publishing Group UK |
record_format | MEDLINE/PubMed |
spelling | pubmed-58695962018-04-02 Intriguingly high thermal conductivity increment for CuO nanowires contained nanofluids with low viscosity Zhu, Dahai Wang, Lingling Yu, Wei Xie, Huaqing Sci Rep Article Nanofluids offer the exciting new possibilities to enhance heat transfer performance. In this paper, experimental and theoretical investigations have been conducted to determine the effect of CuO nanowires on the thermal conductivity and viscosity of dimethicone based nanofluids. The CuO nanowires were prepared through a thermal oxidation method, and the analysis indicated that the as-prepared CuO nanowires had high purity, monocrystalline with a monoclinic structure and large aspect ratio compared to CuO nanospheres. The experimental data show that the thermal conductivity of the nanofluids increases with the volume fraction of CuO nanowires or nanospheres, with a nearly linear relationship. For the nanofluid with the addition of 0.75 vol.% CuO nanowires, the thermal conductivity enhancement is up to 60.78%, which is much higher than that with spherical CuO nanoparticles. The nanofluids exhibit typical Newtonian behavior, and the measured viscosity of CuO nanowires contained nanofluids were found only 6.41% increment at the volume fraction of 0.75%. It is attractive in enhanced heat transfer for application. The thermal conductivity and viscosity of CuO nanofluids were further calculated and discussed by comparing our experimental results with the classic theoretical models. The mechanisms of thermal conductivity and viscosity about nanofluids were also discussed in detail. Nature Publishing Group UK 2018-03-27 /pmc/articles/PMC5869596/ /pubmed/29588467 http://dx.doi.org/10.1038/s41598-018-23174-z Text en © The Author(s) 2018 Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/. |
spellingShingle | Article Zhu, Dahai Wang, Lingling Yu, Wei Xie, Huaqing Intriguingly high thermal conductivity increment for CuO nanowires contained nanofluids with low viscosity |
title | Intriguingly high thermal conductivity increment for CuO nanowires contained nanofluids with low viscosity |
title_full | Intriguingly high thermal conductivity increment for CuO nanowires contained nanofluids with low viscosity |
title_fullStr | Intriguingly high thermal conductivity increment for CuO nanowires contained nanofluids with low viscosity |
title_full_unstemmed | Intriguingly high thermal conductivity increment for CuO nanowires contained nanofluids with low viscosity |
title_short | Intriguingly high thermal conductivity increment for CuO nanowires contained nanofluids with low viscosity |
title_sort | intriguingly high thermal conductivity increment for cuo nanowires contained nanofluids with low viscosity |
topic | Article |
url | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5869596/ https://www.ncbi.nlm.nih.gov/pubmed/29588467 http://dx.doi.org/10.1038/s41598-018-23174-z |
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