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ISSN Online: 2377-424X

ISBN Print: 978-1-56700-474-8

ISBN Online: 978-1-56700-473-1

International Heat Transfer Conference 16
August, 10-15, 2018, Beijing, China

THERMAL CONDUCTIVITY MEASUREMENTS OF Al2O3/WATER NANOFLUIDS USING TIME-DOMAIN THERMOREFLECTANCE METHOD AND HOT WIRE METHOD

Get access (open in a dialog) DOI: 10.1615/IHTC16.tpm.022993
pages 8711-8720

Sinopsis

Due to its potential enhanced heat transfer performance, nanofluid has attracted lots of attention on thermal management engineering. Evaluating its fluidic thermal conductivity, several examining techniques are introduced and widely adopted, i.e., hot wire method and differential scanning calorimetry. In this study, the TDTR system was applied to measure thermal conductivity of Al2O3/water with particle size ranging from 10 to 100 nm and volume ratio ranging from 0.5% to 2.5%, and we compared it with the hot wire method evaluation. As a result, it showed that the optimal trend of thermal conductivity around 50 nm of particle size on both measurement method. In terms of the volume ratio dependency, the higher concentration, the higher thermal conductivity has been obtained. By the comparison, TDTR method is able to measure a general trend of thermal properties under nanofluidic system, but it requires more sensitive control on theromophysical parameters. Furthermore, it is hard to obtain the parameters of heat transfer structure in detail, giving more complexities than hot wire method does. In this regard, its practicability and advantage of the TDTR method have been greatly limited for the measurement of thermal conductivity of nanofluid.