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ISSN Print: 1065-5131
ISSN Online: 1563-5074
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Numerical Investigation of Laminar Forced Convection of Nanofluids through Circular Pipes
ABSTRACT
This paper examines the effects of adding metallic nanoparticles γAl2O3 on the heat transfer enhancement of water flow through circular pipes either under constant wall temperature or uniform wall heat flux thermal boundary condition. Two nanofluid models are employed for simulations. The first model (simpler model) is developed by Maiga et al. [2004], while the second model, which considers the Brownian motion of nanoparticles, is proposed by Koo and Kleinstreuer [2004] based on experimental data of Das et al. [2003]. The numerical results are obtained using a 2D finite-volume code. The pressure field is obtained with the SIMPLE algorithm. Advective volume-face fluxes are approximated using the QUICK scheme. Comparisons of numerical results with experimental data of Zeinali et al. [2007] showed the simpler model underpredicts the heat transfer levels, whilst the second model, returns correct heat transfer levels. Moreover, the first model predicts a higher pressure drop than the second model. As expected, the addition of nanoparticles enhances the heat transfer. The lowest heat transfer enhancement is about 10% for φ = 1%, while the highest is around 30% for φ = 4%. It is also found that the use of nanofluids for heat transfer enhancement is more efficient at lower Reynolds numbers.
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