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Received February 22, 2013
Accepted May 16, 2013
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This is an Open-Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/bync/3.0) which permits
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Accuracy enhancement of thermal dispersion model in prediction of convective heat transfer for nanofluids considering the effects of particle migration
1Department of Energy, Kermanshah University of Technology, Kermanshah, Iran 2CFD Lab & CAE Center, School of Mechanical Engineering, Iran University of Science & Technology, Narmak, Tehran, Iran
bahira@iust.ac.ir
Korean Journal of Chemical Engineering, August 2013, 30(8), 1552-1558(7), 10.1007/s11814-013-0087-7
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Abstract
A thermal dispersion model is utilized for simulation of convective heat transfer of water-TiO2 nanofluid for laminar flow in circular tube. Concentration distribution at cross section of the tube was obtained considering the effects of particle migration, and this concentration distribution was applied in the numerical solution. Numerical solution was done at Reynolds numbers of 500 to 2000 and mean concentrations of 0.5 to 3%. Meanwhile, an experimental study was conducted to investigate the accuracy of the results obtained from the numerical solution. Non-uniformity_x000D_
of the concentration distribution increases with raising mean concentration and Reynolds number. Thereby, for mean concentration of 3%, at Reynolds numbers of 500 and 2000, the concentration from wall to center of the tube increases 2.6 and 30.9%, respectively. In the dispersion model, application of non-uniform concentration distribution improves the accuracy in prediction of the convective heat transfer coefficient in comparison with applying uniform concentration.
Keywords
References
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Xuan YM, Roetzel W, Int. J. Heat Mass Transf., 43(19), 3701 (2000)
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Mokmeli A, Saffar-Avval M, Int. J. Therm. Sci., 49, 471 (2010)
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Bahiraei M, Hosseinalipour SM, Zabihi K, Taheran E, Adv.Mech. Eng., 2012, 742680 (2012)
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Kaviany M, Principles of heat transfer in porous media, Springer, New York (1995)
Phillips RJ, Armstrong RC, Brown RA, Graham AL, Abbott JR, Phys. Fluids, A Fluid Dyn., 4, 30 (1992)
Wen D, Ding Y, Microfluid. Nanofluid., 1, 183 (2005)
