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Investigation of Laminar Convective Heat Transfer for Al2O3-Water Nanofluids Flowing through a Square Cross-Section Duct with a Constant Heat Flux

Department of Mechanical Engineering, Kun Shan University, Tainan 71070, Taiwan
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Author to whom correspondence should be addressed.
Academic Editor: Teen-Hang Meen
Materials 2015, 8(8), 5321-5335; https://doi.org/10.3390/ma8085246
Received: 30 June 2015 / Revised: 4 August 2015 / Accepted: 10 August 2015 / Published: 19 August 2015
(This article belongs to the Special Issue Selected Papers from ICASI 2015)
The objective of this study is to numerically investigate the convective heat transfer of water-based Al2O3 nanofluids flowing through a square cross-section duct with a constant heat flux under laminar flow conditions. The effects of nanoparticle concentration and Peclet number on the heat transfer characteristics of Al2O3-water nanofluids are investigated. The nanoparticle diameter is 25 nm and six particle concentrations (0.2, 0.5, 1, 1.5, 2, and 2.5 vol.%) are considered. The numerical results show that the heat transfer coefficients and Nusselt numbers of Al2O3-water nanofluids increase with increases in the Peclet number as well as particle volume concentration. The heat transfer coefficient of nanofluids is increased by 25.5% at a particle volume concentration of 2.5% and a Peclet number of 7500 as compared with that of the base fluid (pure water). It is noteworthy that at the same particle volume concentration of 2.5%, the enhancement of the convective heat transfer coefficient of Al2O3-water nanofluid (25.5%) is much higher than that of the effective thermal conductivity (9.98%). Thus, the enhancement of the convective heat transfer cannot be solely attributed to the enhancement of the effective thermal conductivity. Additionally, the numerical results coincide well with the published experimental data. View Full-Text
Keywords: nanofluid; convective heat transfer; square cross-section duct; laminar flow nanofluid; convective heat transfer; square cross-section duct; laminar flow
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Ting, H.-H.; Hou, S.-S. Investigation of Laminar Convective Heat Transfer for Al2O3-Water Nanofluids Flowing through a Square Cross-Section Duct with a Constant Heat Flux. Materials 2015, 8, 5321-5335.

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