期刊
JOURNAL OF HEAT TRANSFER-TRANSACTIONS OF THE ASME
卷 136, 期 3, 页码 -出版社
ASME
DOI: 10.1115/1.4025663
关键词
ethylene glycol suspensions; nanofluids; silver nanoparticles; silver nanowires; aspect ratio; thermal conductivity enhancement; viscosity
资金
- National Natural Science Foundation of China (NSFC) [51276159, 51206142]
- China Postdoctoral Science Foundation (CPSF) [2012M511362, 2013T60589]
- Open Fund Program of the Key Laboratory of Efficient Utilization of Low and Medium Grade Energy (Tianjin University)
- Ministry of Education of China [201301-102, 201303-302]
In this technical brief, the effect of adding silver (Ag) nanoparticles of various shapes on the thermal conductivity enhancement of ethylene glycol (EG)-based suspensions was investigated experimentally. These included Ag nanospheres (Ag NSs), Ag nanowires (Ag NWs), and Ag nanoflakes (Ag NFs). Measurements of the thermal conductivity of the suspensions were performed from 10 to 30 degrees C at an increment of 5 degrees C. It was shown that the thermal conductivity of the EG-based suspensions increases with raising the temperature. The Ag NWs of a high aspect ratio (similar to 500) caused greatest relative enhancement up to 15.6% at the highest loading of nearly 0.1 vol. %, whereas the other two shapes of nanoparticles, Ag NSs and Ag NFs with much smaller aspect ratios, only led to enhancements up to 5%. The formation of a network of Ag NWs that facilitates heat conduction was likely responsible for their better performance. The relative enhancement was also predicted by the Hamilton-Crosser model that takes the particle shape effect into consideration. It was shown that the predictions far underestimate the thermal conductivity enhancements but are qualitatively consistent with their shape dependence. As a penalty, however, the presence of Ag NWs was shown to give rise to significant increase in the viscosity of the EG-based suspensions.
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