Journal
JOURNAL OF EXPERIMENTAL NANOSCIENCE
Volume 5, Issue 5, Pages 463-472Publisher
TAYLOR & FRANCIS LTD
DOI: 10.1080/17458081003628949
Keywords
nanofluid; heat transfer; MgO nanoparticle; viscosity; thermal conductivity
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Funding
- Shanghai Municipal Education Commission [10YZ199, 07SG56, 08CG64]
- Shanghai Educational Development Foundation
- Program for Professor of Special Appointment (Eastern Scholar) at Shanghai Institutions of Higher Learning
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Five kinds of oxides, including MgO, TiO(2), ZnO, Al(2)O(3) and SiO(2) nanoparticles were selected as additives and ethylene glycol (EG) was used as base fluid to prepare stable nanofluids. Thermal transport property investigation demonstrated substantial increments in the thermal conductivity and viscosity of all these nanofluids with oxide nanoparticle addition in EG. Among all the studied nanofluids, MgO-EG nanofluid was found to have superior features, with the highest thermal conductivity and lowest viscosity. The thermal conductivity enhancement ratio of MgO-EG nanofluid increases nonlinearly with the volume fraction of nanoparticles. In the experimental temperature range of 10-60 degrees C, thermal conductivity enhancement ratio of MgO-EG nanofluids appears to have a weak dependence on the temperature. Viscosity measurements showed that MgO-EG nanofluids demonstrated Newtonian rheological behaviour, and the viscosity significantly decreases with the temperature. The thermal conductivity and viscosity increments of the nanofluids are much higher than the corresponding values predicted by the existing classical models for the solid-liquid mixture.
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