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Effects of inclusion size on thermal conductivity and rheological behavior of ethylene glycol-based suspensions containing silver nanowires with various specific surface areas
KTH, School of Architecture and the Built Environment (ABE), Civil and Architectural Engineering. Yunnan Electric Power and Research Institute (Group)Kunming, China.
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2015 (English)In: International Journal of Heat and Mass Transfer, ISSN 0017-9310, Vol. 81, 554-562 p.Article in journal (Refereed) Published
Abstract [en]

This work is concerned with the size effects of Ag nanowires on thermal conductivity and rheological behavior of EG-based suspensions. The influences of inclusion concentration and temperature on the thermophysical properties of specimens containing three types of Ag nanowires were also investigated. It was shown that the measured thermal conductivity of EG-based suspensions increased with the rising temperature and loading. Besides, the relative enhancement in thermal conductivity exhibited a linear relationship with respect to the specific surface area of Ag nanowires. A theoretical approach was developed to predict the effective thermal conductivity of suspensions containing nanowires by introducing liquid layer into account. The Ag nanowires/EG interface thermal resistances were extracted from the experimental results, which ranged from 2.0 x 10(8) to 5 x 10(8) m(2) K/W. Furthermore, a comparative study revealed the excellent performance of Ag nanowires used in present work on improving thermal conductivity compared with the reported studies. Finally, the presence of Ag nanowires with the highest aspect ratio (250) was concluded as the main explanation of a noticeable rise in dynamic viscosity and non-Brownian fluid behavior of EG-based suspensions at the highest loading (10 mg/mL).

Place, publisher, year, edition, pages
2015. Vol. 81, 554-562 p.
Keyword [en]
Thermal conductivity, Rheological behavior, Nanofluids, Ag nanowires, Specific surface area
National Category
Other Engineering and Technologies
URN: urn:nbn:se:kth:diva-159348DOI: 10.1016/j.ijheatmasstransfer.2014.10.043ISI: 000346951400055ScopusID: 2-s2.0-84910618581OAI: diva2:785104

QC 20150202

Available from: 2015-02-02 Created: 2015-01-29 Last updated: 2015-02-02Bibliographically approved

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Lu, Hai
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