Research Papers

Measurement of the Thermal Conductivity of Silicon Dioxide Nanofluid and Development of Correlations

[+] Author and Article Information
Debendra K. Das

e-mail: dkdas@alaska.edu

Jagannadha R. Satti

College of Engineering and Mines,
University of Alaska Fairbanks,
P.O. Box 755905,
Fairbanks, AK 99775-5905

1Corresponding author.

Manuscript received March 13, 2012; final manuscript received February 26, 2013; published online April 16, 2013. Assoc. Editor: Debjyoti Banerjee.

J. Nanotechnol. Eng. Med 3(4), 041006 (Apr 16, 2013) (10 pages) doi:10.1115/1.4024003 History: Received March 13, 2012; Revised February 26, 2013

Experimental investigations were carried out for the determination of thermal conductivity of silicon dioxide (SiO2) nanoparticles dispersed in 60% ethylene glycol and 40% water by mass. Experiments conducted in a temperature range of 20 °C to 90 °C and for several particle volumetric concentrations up to 10% showed that the ratio of thermal conductivity of nanofluid to that of the base fluid increased with an increase in temperature and volumetric concentration. As an example, as much as a 20% enhancement in thermal conductivity was evidenced for a particle volumetric concentration of 10% at 87 °C. Comparison of experimental results of this nonmetallic nanoparticles suspension with the well-known model developed by Hamilton and Crosser for microparticles suspensions, exhibits that this model underpredicts the thermal conductivity of nanofluids. Therefore, a new correlation has been derived following recent models developed for metallic nanoparticles suspensions, which is a combination of the Hamilton–Crosser model plus a term due to the Brownian motion. This new correlation expresses the thermal conductivity of silicon dioxide nanofluid as a function of temperature, volumetric concentration and the properties of the base fluid and the nanoparticles.

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Fig. 1

Experimental setup for thermal conductivity measurements of nanofluids

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Fig. 2

Calibration of the apparatus using air as the test fluid

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Fig. 3

Benchmark test case to compare measured thermal conductivity values with the ASHRAE data for 60:40 EG/W

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Fig. 4

TEM image of SiO2 nanoparticles taken before the measurement of thermal conductivity

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Fig. 5

Variation of thermal conductivity with temperature for several concentrations of SiO2 nanofluid

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Fig. 6

Variation of thermal conductivity ratio with temperature for different volumetric concentrations of SiO2 nanofluid

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Fig. 7

Variation of thermal conductivity ratio with concentration for SiO2 nanofluid

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Fig. 8

Comparison of experimental thermal conductivity with predicted values for SiO2 nanofluid obtained from the new correlations (Eqs. 16(a)16(c))




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