Viscosity and Thermal Conductivity of Stable Graphite Suspensions Near Percolation
Nanofluids have received much attention in part due to the range of properties possible with different combinations of nanoparticles and base fluids. In this work, we measure the viscosity of suspensions of graphite particles in ethylene glycol as a function of the volume fraction, shear rate, and t...
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| Language: | en_US |
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American Chemical Society (ACS)
2016
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| Online Access: | http://hdl.handle.net/1721.1/100774 https://orcid.org/0000-0001-9954-6895 https://orcid.org/0000-0001-8323-2779 https://orcid.org/0000-0002-3968-8530 https://orcid.org/0000-0001-7506-2888 |
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| author | Ma, Lei Wang, Jianjian Marconnet, Amy Marie Barbati, Alexander C. McKinley, Gareth H. Liu, Wei Chen, Gang |
| author2 | Massachusetts Institute of Technology. Department of Mechanical Engineering |
| author_facet | Massachusetts Institute of Technology. Department of Mechanical Engineering Ma, Lei Wang, Jianjian Marconnet, Amy Marie Barbati, Alexander C. McKinley, Gareth H. Liu, Wei Chen, Gang |
| author_sort | Ma, Lei |
| collection | MIT |
| description | Nanofluids have received much attention in part due to the range of properties possible with different combinations of nanoparticles and base fluids. In this work, we measure the viscosity of suspensions of graphite particles in ethylene glycol as a function of the volume fraction, shear rate, and temperature below and above the percolation threshold. We also measure and contrast the trends observed in the viscosity with increasing volume fraction to the thermal conductivity behavior of the same suspensions: above the percolation threshold, the slope that describes the rate of thermal conductivity enhancement with concentration reduces compared to below the percolation threshold, whereas that of the viscosity enhancement increases. While the thermal conductivity enhancement is independent of temperature, the viscosity changes show a strong dependence on temperature and exhibit different trends with respect to the temperature at different shear rates above the percolation threshold. Interpretation of the experimental observations is provided within the framework of Stokesian dynamics simulations of the suspension microstructure and suggests that although diffusive contributions are not important for the observed thermal conductivity enhancement, they are important for understanding the variations in the viscosity with changes of temperature and shear rate above the percolation threshold. The experimental results can be collapsed to a single master curve through calculation of a single dimensionless parameter (a Péclet number based on the rotary diffusivity of the graphite particles). |
| first_indexed | 2024-09-23T15:54:24Z |
| format | Article |
| id | mit-1721.1/100774 |
| institution | Massachusetts Institute of Technology |
| language | en_US |
| last_indexed | 2024-09-23T15:54:24Z |
| publishDate | 2016 |
| publisher | American Chemical Society (ACS) |
| record_format | dspace |
| spelling | mit-1721.1/1007742022-09-29T16:58:46Z Viscosity and Thermal Conductivity of Stable Graphite Suspensions Near Percolation Ma, Lei Wang, Jianjian Marconnet, Amy Marie Barbati, Alexander C. McKinley, Gareth H. Liu, Wei Chen, Gang Massachusetts Institute of Technology. Department of Mechanical Engineering Chen, Gang Chen, Gang Ma, Lei Wang, Jianjian McKinley, Gareth H. Marconnet, Amy Marie Nanofluids have received much attention in part due to the range of properties possible with different combinations of nanoparticles and base fluids. In this work, we measure the viscosity of suspensions of graphite particles in ethylene glycol as a function of the volume fraction, shear rate, and temperature below and above the percolation threshold. We also measure and contrast the trends observed in the viscosity with increasing volume fraction to the thermal conductivity behavior of the same suspensions: above the percolation threshold, the slope that describes the rate of thermal conductivity enhancement with concentration reduces compared to below the percolation threshold, whereas that of the viscosity enhancement increases. While the thermal conductivity enhancement is independent of temperature, the viscosity changes show a strong dependence on temperature and exhibit different trends with respect to the temperature at different shear rates above the percolation threshold. Interpretation of the experimental observations is provided within the framework of Stokesian dynamics simulations of the suspension microstructure and suggests that although diffusive contributions are not important for the observed thermal conductivity enhancement, they are important for understanding the variations in the viscosity with changes of temperature and shear rate above the percolation threshold. The experimental results can be collapsed to a single master curve through calculation of a single dimensionless parameter (a Péclet number based on the rotary diffusivity of the graphite particles). United States. Air Force Office of Scientific Research (FA9550-11-1-0174) National Natural Science Foundation (China) (51036003) 2016-01-08T03:13:38Z 2016-01-08T03:13:38Z 2014-12 Article http://purl.org/eprint/type/JournalArticle 1530-6984 1530-6992 http://hdl.handle.net/1721.1/100774 Ma, Lei, Jianjian Wang, Amy M. Marconnet, Alexander C. Barbati, Gareth H. McKinley, Wei Liu, and Gang Chen. “Viscosity and Thermal Conductivity of Stable Graphite Suspensions Near Percolation.” Nano Lett. 15, no. 1 (January 14, 2015): 127–133. https://orcid.org/0000-0001-9954-6895 https://orcid.org/0000-0001-8323-2779 https://orcid.org/0000-0002-3968-8530 https://orcid.org/0000-0001-7506-2888 en_US http://dx.doi.org/10.1021/nl503181w Nano Letters Article is made available in accordance with the publisher's policy and may be subject to US copyright law. Please refer to the publisher's site for terms of use. application/pdf American Chemical Society (ACS) Gang Chen |
| spellingShingle | Ma, Lei Wang, Jianjian Marconnet, Amy Marie Barbati, Alexander C. McKinley, Gareth H. Liu, Wei Chen, Gang Viscosity and Thermal Conductivity of Stable Graphite Suspensions Near Percolation |
| title | Viscosity and Thermal Conductivity of Stable Graphite Suspensions Near Percolation |
| title_full | Viscosity and Thermal Conductivity of Stable Graphite Suspensions Near Percolation |
| title_fullStr | Viscosity and Thermal Conductivity of Stable Graphite Suspensions Near Percolation |
| title_full_unstemmed | Viscosity and Thermal Conductivity of Stable Graphite Suspensions Near Percolation |
| title_short | Viscosity and Thermal Conductivity of Stable Graphite Suspensions Near Percolation |
| title_sort | viscosity and thermal conductivity of stable graphite suspensions near percolation |
| url | http://hdl.handle.net/1721.1/100774 https://orcid.org/0000-0001-9954-6895 https://orcid.org/0000-0001-8323-2779 https://orcid.org/0000-0002-3968-8530 https://orcid.org/0000-0001-7506-2888 |
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