Journal
POWDER TECHNOLOGY
Volume 230, Issue -, Pages 14-19Publisher
ELSEVIER
DOI: 10.1016/j.powtec.2012.06.016
Keywords
Nanofluid; Ethylene glycol and water mixture; Viscosity; Al2O3 nanoparticle; Thermal conductivity; Heat transfer coefficient
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Funding
- National Natural Science Foundation of China [51106093]
- Program for New Century Excellent Talents in University [NECT-10-883]
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This paper presents an experimental investigation of rheological and heat transfer properties of Al2O3 nanofluids based on the mixture of 45 vol.% ethylene glycol and 55 vol.% water. The Al2O3 nanofluids (volume fraction phi=0.02) over 45 degrees C exhibit Newtonian behaviors, below 45 degrees C, they will be non-Newtonian fluids. The enhanced thermal conductivity ratios of the nanofluids with the volume fraction 1.0%, 2.0% and 3.0% are 3.8%, 7.7%, and 11.6% respectively, slightly larger than those predicted by the classic theoretical models. The heat transfer coefficients of the nanofluids with 1.0vol.% and 2.0vol.% have been found an increase up to 57% and 106%, respectively, when the Reynolds number is 2000. (C) 2012 Elsevier B.V. All rights reserved.
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