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Heat Transfer Research
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ISSN Druckformat: 1064-2285
ISSN Online: 2162-6561

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Heat Transfer Research

DOI: 10.1615/HeatTransRes.v41.i3.100
pages 339-351

Experimental Study on Thermal Conductivity and Viscosity of Water-Based Nanofluids

Ismail Tavman
Dokuz Eylul University
Alpaslan Turgut
Mechanical Engineering Department, Dokuz Eylul University, 35100 Bornova Izmir, Turkey
Mihail Chirtoc
Thermophysics Laboratory, GRESPI, University of Reims, BP 1039, 51687 Reims Cedex 2, France
Kliment Hadjov
University of Chemical Technology and Metallurgy of Sofia, blv. Kl. Ohridski 8, 1756 Sofia, Bulgaria
Olivier Fudym
Universite de Toulouse, Mines Albi, CNRS, Centre RAPSODEE, Campus Jarlard, F-81013 Albi cedex 09, France
Sebnem Tavman
Food Engineering Department, Ege University, 35100 Bornova Izmir, Turkey

ABSTRAKT

Thermal conductivity and viscosity of deionized water-based TiO2, SiO2, and Al2O3 nanofluids were investigated for various volume fractions of nanoparticles content and at different temperatures. A 3ω technique was developed for measuring thermal conductivity of nanofluids. The theory and the experimental setup of the 3ω measuring system is explained; a conductive wire is used as both heater and sensor in this system. At first, the system is calibrated using water with known thermophysical properties. Measured results showed that the effective thermal conductivity of nanofluids increases as the concentration of the particles increases but not anomalously as indicated in the majority of the literature and this enhancement is very close to the Hamilton-Crosser model; also this increase is independent of the temperature. The effective viscosities of these nanofluids increase by the increasing particle concentration and decrease with an increase in temperature, and cannot be predicted by the Einstein model.


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