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ISSN Online: 2377-424X

ISBN CD: 1-56700-226-9

ISBN Online: 1-56700-225-0

International Heat Transfer Conference 13
August, 13-18, 2006, Sydney, Australia

EXPERIMENTAL AND ANALYTICAL INVESTIGATIONS OF THERMOPHYSICAL PROPERTIES OF NANOFLUIDS

Get access (open in a dialog) DOI: 10.1615/IHTC13.p8.180
9 pages

要約

This paper presents experimental results and mathematical models for the effective thermal conductivity and viscosity of different types of nanofluids. The transient hot-wire (THW) method was used to measure the effective thermal conductivity at different temperatures while the viscosity was measured by a controlled rate rheometer at room temperature. By considering the effects of particle size and interfacial layer, two models are presented to predict the enhanced thermal conductivity of nanofluids having spherical and cylindrical nanoparticles at room temperature. The thermal conductivities of nanofluids were found to be substantially higher than the values for the base fluids. Their values increase with the nanoparticle volume fraction and are strongly dependent on temperature. The proposed models show reasonably good agreement with the experimental results and give better predictions for the effective thermal conductivity of nanofluids compared to existing classical models. Based on the calibration results from the transient hot-wire method for the base fluids i.e. deionised water and ethylene glycol, the measurement error was estimated to be within 2 %. The measured values of effective viscosities of nanofluids, which were underestimated by classical models, were also found to increase with the volumetric loading of nanoparticles.