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ISSN Online: 2377-424X

ISBN Print: 978-1-56700-474-8

ISBN Online: 978-1-56700-473-1

International Heat Transfer Conference 16
August, 10-15, 2018, Beijing, China

HEAT TRANSFER ENHANCEMENT OF DILUTE AL2O3-MWCNT WATER BASED HYBRID NANOFLUIDS IN A SQUARE CAVITY

Get access (open in a dialog) DOI: 10.1615/IHTC16.hte.023927
pages 5365-5372

Résumé

The emerging research trend of augmenting thermo-physical, heat transfer and flow characteristics of conventional heat transfer fluids in energy systems is currently gaining attention. Two hybrid nanofluids of Al2O3-MWCNT/water at 90%-10% and 95%-5% by weight for 0.1% volume concentration were investigated for their viscosity, and thermal conductivity at a temperature range of 288.15 K-328 K, and natural convection heat transfer performance in a differentially heated square cavity. Previous studies on mono-particle nanofluids of Al2O3 and MWCNT have shown that maximum heat transfer performance of these nanofluids occurred at 0.1 vol.%. The result showed that the addition of the hybrid nanoparticles to the base fluid enhanced maximally the thermal conductivity by 1.32%, and viscosity by 35.71%, compared with the base fluid for Al2O3 (90%)-MWCNT (10%)/water nanofluid. Temperature increase was observed to increase thermal conductivity while it decreased viscosity. The natural convective heat transfer of the formulated hybrid nanofluids in the cavity conducted for Ra range of 2.27 × 108 to 4.70 × 108 revealed the enhancement of hav, Nuav and average heat transfer rate by 12.7% to 19.4%, 11.8% to 17.2%, and 7.2% to 9.8%, for the water-based Al2O3 (95%)-MWCNT (5%) and Al2O3 (90%)-MWCNT (10%) nanofluids, respectively (compared with the base fluid). The augmentation of hav as obtained in this study was slightly higher than the maximum of 15% and 18% reported in previous works for Al2O3/water nanofluids. This showed the possible enhancement of heat transfer performance of nanofluids using hybrid nanofluids.