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DOI: 10.1615/ICHMT.2008.CHT.1990
page 17

Mehrdad Raisee
School of Mechanical Engineering, College of Engineering, University of Tehran, Center of Excellence in Design and Optimization of Energy Systems (CEDOES), Tehran, Iran

Mostafa Moghaddami
University of Tehran

Zahra Niroobakhsh
Department of Mechanical Engineering, Faculty of Engineering, P.O. Box: 11365/4563, Tehran, Iran


This paper examines the effects of adding metallic nanoparticles γAl2O3 on the heat transfer enhancement of water flow through pipe under both constant wall temperature and uniform wall heat-flux thermal boundary conditions. Two nanofluid models are employed for computations. The first model (simpler model) is based on experimental works of Masuda et al. [1993], Lee et al. [1999] and Wang et al. [1999], 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 first model underpredicts the heat transfer levels, while the second model which include the Brownian motion, return correct heat transfer level. Moreover, the first model predicts unrealistically high pressure drop. 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 the use of nanofluids for heat transfer enhancement is more efficient at lower Reynolds numbers.

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