Heat conduction mechanisms in nanofluids and suspensions
Nanofluids, liquids containing suspensions of nanoparticles, have been reported by some groups to exhibit substantially higher thermal conductivity than that of their corresponding base fluids that cannot be explained by existing theories. However, the reported high thermal conductivity sometimes ca...
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| Format: | Article |
| Language: | en_US |
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Elsevier
2016
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| Online Access: | http://hdl.handle.net/1721.1/103956 https://orcid.org/0000-0001-9954-6895 https://orcid.org/0000-0002-3968-8530 |
| _version_ | 1811093760472252416 |
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| author | Wang, Jianjian Gao, Jinwei Chen, Gang Zheng, Ruiting |
| author2 | Massachusetts Institute of Technology. Department of Mechanical Engineering |
| author_facet | Massachusetts Institute of Technology. Department of Mechanical Engineering Wang, Jianjian Gao, Jinwei Chen, Gang Zheng, Ruiting |
| author_sort | Wang, Jianjian |
| collection | MIT |
| description | Nanofluids, liquids containing suspensions of nanoparticles, have been reported by some groups to exhibit substantially higher thermal conductivity than that of their corresponding base fluids that cannot be explained by existing theories. However, the reported high thermal conductivity sometimes cannot be reproduced by others. Potential mechanisms leading to this enhancement are still under scrutiny. In this paper, we first take a critical review of heat conduction mechanisms proposed in literature, and then summarize our work. Our experimental studies demonstrate that nanoparticle clustering is the key contributor to the thermal conductivity enhancement. Guided by this insight, we use graphite flakes as additives and develop a method to prepare stable graphite suspensions with large thermal conductivity enhancement in water and oil. We also observe thermal percolation phenomenon and explained the phenomenon based on combined optical and AC impedance spectroscopy studies. We demonstrate temperature regulation of electrical and thermal properties of graphite suspensions through solid–liquid phase change, which may potentially be useful in energy systems in the future. |
| first_indexed | 2024-09-23T15:50:14Z |
| format | Article |
| id | mit-1721.1/103956 |
| institution | Massachusetts Institute of Technology |
| language | en_US |
| last_indexed | 2024-09-23T15:50:14Z |
| publishDate | 2016 |
| publisher | Elsevier |
| record_format | dspace |
| spelling | mit-1721.1/1039562022-10-02T04:29:24Z Heat conduction mechanisms in nanofluids and suspensions Wang, Jianjian Gao, Jinwei Chen, Gang Zheng, Ruiting Massachusetts Institute of Technology. Department of Mechanical Engineering Chen, Gang Wang, Jianjian Gao, Jinwei Chen, Gang Zheng, Ruiting Nanofluids, liquids containing suspensions of nanoparticles, have been reported by some groups to exhibit substantially higher thermal conductivity than that of their corresponding base fluids that cannot be explained by existing theories. However, the reported high thermal conductivity sometimes cannot be reproduced by others. Potential mechanisms leading to this enhancement are still under scrutiny. In this paper, we first take a critical review of heat conduction mechanisms proposed in literature, and then summarize our work. Our experimental studies demonstrate that nanoparticle clustering is the key contributor to the thermal conductivity enhancement. Guided by this insight, we use graphite flakes as additives and develop a method to prepare stable graphite suspensions with large thermal conductivity enhancement in water and oil. We also observe thermal percolation phenomenon and explained the phenomenon based on combined optical and AC impedance spectroscopy studies. We demonstrate temperature regulation of electrical and thermal properties of graphite suspensions through solid–liquid phase change, which may potentially be useful in energy systems in the future. United States. Air Force Office of Scientific Research (AFOSR FA9550-11-1-0174) China. Fundamental Research Funds for the Central Universities 2016-08-18T20:08:01Z 2016-08-18T20:08:01Z 2012-02 2012-02 Article http://purl.org/eprint/type/JournalArticle 17480132 http://hdl.handle.net/1721.1/103956 Wang, J.J., R.T. Zheng, J.W. Gao, and G. Chen. “Heat Conduction Mechanisms in Nanofluids and Suspensions.” Nano Today 7, no. 2 (April 2012): 124–136. https://orcid.org/0000-0001-9954-6895 https://orcid.org/0000-0002-3968-8530 en_US http://dx.doi.org/10.1016/j.nantod.2012.02.007 Nano Today Creative Commons Attribution-NonCommercial-NoDrevs License http://creativecommons.org/license/by-nc-nd/4.0/ application/pdf Elsevier Chen, Gang |
| spellingShingle | Wang, Jianjian Gao, Jinwei Chen, Gang Zheng, Ruiting Heat conduction mechanisms in nanofluids and suspensions |
| title | Heat conduction mechanisms in nanofluids and suspensions |
| title_full | Heat conduction mechanisms in nanofluids and suspensions |
| title_fullStr | Heat conduction mechanisms in nanofluids and suspensions |
| title_full_unstemmed | Heat conduction mechanisms in nanofluids and suspensions |
| title_short | Heat conduction mechanisms in nanofluids and suspensions |
| title_sort | heat conduction mechanisms in nanofluids and suspensions |
| url | http://hdl.handle.net/1721.1/103956 https://orcid.org/0000-0001-9954-6895 https://orcid.org/0000-0002-3968-8530 |
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