The difference in the thermal conductivity of nanofluids measured by different methods and its rationalization
A suspension of particles below 100 nm in size, usually termed as nanofluid, often shows a notable enhancement in thermal conductivity, when measured by the transient hot-wire method. In contrast, when the conductivity of the same nanofluid is measured by the laser flash method, the enhancement repo...
| Main Authors: | , , |
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| Format: | Article |
| Language: | English |
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Beilstein-Institut
2016-12-01
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| Series: | Beilstein Journal of Nanotechnology |
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| Online Access: | https://doi.org/10.3762/bjnano.7.194 |
| _version_ | 1818016098833924096 |
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| author | Aparna Zagabathuni Sudipto Ghosh Shyamal Kumar Pabi |
| author_facet | Aparna Zagabathuni Sudipto Ghosh Shyamal Kumar Pabi |
| author_sort | Aparna Zagabathuni |
| collection | DOAJ |
| description | A suspension of particles below 100 nm in size, usually termed as nanofluid, often shows a notable enhancement in thermal conductivity, when measured by the transient hot-wire method. In contrast, when the conductivity of the same nanofluid is measured by the laser flash method, the enhancement reported is about one order of magnitude lower. This difference has been quantitatively resolved for the first time on the basis of the collision-mediated heat transfer model for nanofluids proposed earlier by our research group. Based on the continuum simulation coupled with stochastic analysis, the present theoretical prediction agrees well with the experimental observations from different measuring methods reported in the literature, and fully accounts for the different results from the two measuring methods mentioned above. This analysis also gives an indication that the nanofluids are unlikely to be effective for heat transfer in microchannels. |
| first_indexed | 2024-04-14T07:07:22Z |
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| institution | Directory Open Access Journal |
| issn | 2190-4286 |
| language | English |
| last_indexed | 2024-04-14T07:07:22Z |
| publishDate | 2016-12-01 |
| publisher | Beilstein-Institut |
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| series | Beilstein Journal of Nanotechnology |
| spelling | doaj.art-b0682c8200ca4bb781c5204602a325a62022-12-22T02:06:32ZengBeilstein-InstitutBeilstein Journal of Nanotechnology2190-42862016-12-01712037204410.3762/bjnano.7.1942190-4286-7-194The difference in the thermal conductivity of nanofluids measured by different methods and its rationalizationAparna Zagabathuni0Sudipto Ghosh1Shyamal Kumar Pabi2Department of Metallurgical and Materials Engineering, Indian Institute of Technology Kharagpur, West Bengal-721302, IndiaDepartment of Metallurgical and Materials Engineering, Indian Institute of Technology Kharagpur, West Bengal-721302, IndiaDepartment of Metallurgical and Materials Engineering, Indian Institute of Technology Kharagpur, West Bengal-721302, IndiaA suspension of particles below 100 nm in size, usually termed as nanofluid, often shows a notable enhancement in thermal conductivity, when measured by the transient hot-wire method. In contrast, when the conductivity of the same nanofluid is measured by the laser flash method, the enhancement reported is about one order of magnitude lower. This difference has been quantitatively resolved for the first time on the basis of the collision-mediated heat transfer model for nanofluids proposed earlier by our research group. Based on the continuum simulation coupled with stochastic analysis, the present theoretical prediction agrees well with the experimental observations from different measuring methods reported in the literature, and fully accounts for the different results from the two measuring methods mentioned above. This analysis also gives an indication that the nanofluids are unlikely to be effective for heat transfer in microchannels.https://doi.org/10.3762/bjnano.7.194Brownian movementcollision-mediated heat transfer modellaser flash methodnanofluidsthermal conductivitytransient hot-wire method |
| spellingShingle | Aparna Zagabathuni Sudipto Ghosh Shyamal Kumar Pabi The difference in the thermal conductivity of nanofluids measured by different methods and its rationalization Beilstein Journal of Nanotechnology Brownian movement collision-mediated heat transfer model laser flash method nanofluids thermal conductivity transient hot-wire method |
| title | The difference in the thermal conductivity of nanofluids measured by different methods and its rationalization |
| title_full | The difference in the thermal conductivity of nanofluids measured by different methods and its rationalization |
| title_fullStr | The difference in the thermal conductivity of nanofluids measured by different methods and its rationalization |
| title_full_unstemmed | The difference in the thermal conductivity of nanofluids measured by different methods and its rationalization |
| title_short | The difference in the thermal conductivity of nanofluids measured by different methods and its rationalization |
| title_sort | difference in the thermal conductivity of nanofluids measured by different methods and its rationalization |
| topic | Brownian movement collision-mediated heat transfer model laser flash method nanofluids thermal conductivity transient hot-wire method |
| url | https://doi.org/10.3762/bjnano.7.194 |
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