Drag reduction and heat transfer characteristics of graphene oxide nanosheet suspensions
This study investigated graphene oxide nanosheets, with excellent thermal conductivity and water dispersibility, as additives that could achieve a trade-off relationship between drag reduction and heat transfer improvement. We experimentally clarified the heat flow characteristics of graphene oxide...
| Main Authors: | , , , |
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| Format: | Article |
| Language: | Japanese |
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The Japan Society of Mechanical Engineers
2020-04-01
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| Series: | Nihon Kikai Gakkai ronbunshu |
| Subjects: | |
| Online Access: | https://www.jstage.jst.go.jp/article/transjsme/86/885/86_20-00047/_pdf/-char/en |
| _version_ | 1811308700552396800 |
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| author | Satoshi OGATA Yuta NISHINA Hiroshi TOCHIGI Keizo WATANABE |
| author_facet | Satoshi OGATA Yuta NISHINA Hiroshi TOCHIGI Keizo WATANABE |
| author_sort | Satoshi OGATA |
| collection | DOAJ |
| description | This study investigated graphene oxide nanosheets, with excellent thermal conductivity and water dispersibility, as additives that could achieve a trade-off relationship between drag reduction and heat transfer improvement. We experimentally clarified the heat flow characteristics of graphene oxide nanosheet suspensions in a circular pipe. The graphene oxide nanosheets have a size of 0.8 nm × 3 μm × 3 μm. The test suspension concentrations were 0.1 wt%, 0.3 wt%, and 0.5 wt%. For a comparison, a 0.5 wt% TiO2 suspension showing an improvement in the heat transfer coefficient and a 15 ppm Peo solution with drag reduction were also prepared. The experimental results show that the frictional coefficient of the graphene oxide nanosheet suspensions was reduced by up to 36.5% compared to that of distilled water in the turbulent flow region. The amount of drag reduction increased with the increase of Reynolds number. After reaching the maximum value, it gradually approached a constant value. Meanwhile, the Nusselt number of the graphene oxide nanosheet suspensions increased by 10 – 20% in the range of the Reynolds number where the drag reduction occurred. This result indicates that the nanosheets improved the heat transfer performance, which increased with increasing concentration and Reynolds number. In conclusion, improvements in both drag reduction and heat transfer cannot be achieved in the TiO2 suspension and Peo solution, but these properties were found in the graphene oxide nanosheet suspensions used herein. |
| first_indexed | 2024-04-13T09:29:11Z |
| format | Article |
| id | doaj.art-961996adc0484f2b88e79a8927866065 |
| institution | Directory Open Access Journal |
| issn | 2187-9761 |
| language | Japanese |
| last_indexed | 2024-04-13T09:29:11Z |
| publishDate | 2020-04-01 |
| publisher | The Japan Society of Mechanical Engineers |
| record_format | Article |
| series | Nihon Kikai Gakkai ronbunshu |
| spelling | doaj.art-961996adc0484f2b88e79a89278660652022-12-22T02:52:21ZjpnThe Japan Society of Mechanical EngineersNihon Kikai Gakkai ronbunshu2187-97612020-04-018688520-0004720-0004710.1299/transjsme.20-00047transjsmeDrag reduction and heat transfer characteristics of graphene oxide nanosheet suspensionsSatoshi OGATA0Yuta NISHINA1Hiroshi TOCHIGI2Keizo WATANABE3Department of Mechanical Systems Engineering, Tokyo Metropolitan UniversityResearch Core for Interdisciplinary Sciences, Okayama UniversityCosmo Oil Lubricants Co., LTD.Department of Mechanical Systems Engineering, Tokyo Metropolitan UniversityThis study investigated graphene oxide nanosheets, with excellent thermal conductivity and water dispersibility, as additives that could achieve a trade-off relationship between drag reduction and heat transfer improvement. We experimentally clarified the heat flow characteristics of graphene oxide nanosheet suspensions in a circular pipe. The graphene oxide nanosheets have a size of 0.8 nm × 3 μm × 3 μm. The test suspension concentrations were 0.1 wt%, 0.3 wt%, and 0.5 wt%. For a comparison, a 0.5 wt% TiO2 suspension showing an improvement in the heat transfer coefficient and a 15 ppm Peo solution with drag reduction were also prepared. The experimental results show that the frictional coefficient of the graphene oxide nanosheet suspensions was reduced by up to 36.5% compared to that of distilled water in the turbulent flow region. The amount of drag reduction increased with the increase of Reynolds number. After reaching the maximum value, it gradually approached a constant value. Meanwhile, the Nusselt number of the graphene oxide nanosheet suspensions increased by 10 – 20% in the range of the Reynolds number where the drag reduction occurred. This result indicates that the nanosheets improved the heat transfer performance, which increased with increasing concentration and Reynolds number. In conclusion, improvements in both drag reduction and heat transfer cannot be achieved in the TiO2 suspension and Peo solution, but these properties were found in the graphene oxide nanosheet suspensions used herein.https://www.jstage.jst.go.jp/article/transjsme/86/885/86_20-00047/_pdf/-char/encircular pipe flowpressure dropheat transferdrag reductiongraphene oxide suspension |
| spellingShingle | Satoshi OGATA Yuta NISHINA Hiroshi TOCHIGI Keizo WATANABE Drag reduction and heat transfer characteristics of graphene oxide nanosheet suspensions Nihon Kikai Gakkai ronbunshu circular pipe flow pressure drop heat transfer drag reduction graphene oxide suspension |
| title | Drag reduction and heat transfer characteristics of graphene oxide nanosheet suspensions |
| title_full | Drag reduction and heat transfer characteristics of graphene oxide nanosheet suspensions |
| title_fullStr | Drag reduction and heat transfer characteristics of graphene oxide nanosheet suspensions |
| title_full_unstemmed | Drag reduction and heat transfer characteristics of graphene oxide nanosheet suspensions |
| title_short | Drag reduction and heat transfer characteristics of graphene oxide nanosheet suspensions |
| title_sort | drag reduction and heat transfer characteristics of graphene oxide nanosheet suspensions |
| topic | circular pipe flow pressure drop heat transfer drag reduction graphene oxide suspension |
| url | https://www.jstage.jst.go.jp/article/transjsme/86/885/86_20-00047/_pdf/-char/en |
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