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DOI: 10.1615/ICHMT.2009.CONV.930
page 10

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


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, in which a conductive wire is used as both heater and sensor. At first, the system is calibrated using water with known thermophysical properties. Measured results showed that the effective thermal conductivity of nanofluids increase as the concentration of the particles increase but not anomalously as indicated in the majority of the literature and this enhancement is very close to Hamilton-Crosser model, also this increase is independent of the temperature. The effective viscosities of these nanofluids increased by the increasing particle concentration and decrease by the increase in temperature, and can not be predicted by Einstein model.

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