Thermal conductivity measurement of methanol-based nanofluids with Al 2O 3 and SiO 2 nanoparticles
- Authors
- Pang, C.; Jung, J.-Y.; Lee, J.W.; Kang, Y.T.
- Issue Date
- 2012
- Keywords
- Clustering; Methanol-based nanofluids; Particle size; Thermal conductivity; Zeta potential
- Citation
- International Journal of Heat and Mass Transfer, v.55, no.21-22, pp 5597 - 5602
- Pages
- 6
- Journal Title
- International Journal of Heat and Mass Transfer
- Volume
- 55
- Number
- 21-22
- Start Page
- 5597
- End Page
- 5602
- URI
- https://www.kriso.re.kr/sciwatch/handle/2021.sw.kriso/1051
- DOI
- 10.1016/j.ijheatmasstransfer.2012.05.048
- ISSN
- 0017-9310
1879-2189
- Abstract
- In this study, the methanol-based nanofluids with Al 2O 3 and SiO 2 nanoparticles are prepared by dispersing nanoparticles in pure methanol using an ultrasonic equipment. The main objective of this paper is to measure the thermal conductivity of the methanol-based nanofluids. We have also measured the zeta potential, particle size and Tyndall effect for the present nanofluids. The transient hot-wire method is applied for measuring the thermal conductivity of methanol-based nanofluids. The measurement uncertainty in repeatability is obtained as 1.95% for deionized (DI) water and 1.34% for pure methanol, respectively. The effective thermal conductivity of methanol-based nanofluids is measured at a temperature of 293.15 K. The results show that the thermal conductivity increases with an increase of the nanoparticle volume fraction, and the enhancement is observed to be 10.74% and 14.29% over the basefluid at the volume fraction of 0.5vol% for Al 2O 3 and SiO 2 nanoparticles, respectively. Clustering of nanoparticles is considered to be the main reason for the thermal conductivity enhancement. ? 2012 Elsevier Ltd. All rights reserved.
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