TY - JOUR ID - 71838 TI - Numerical Simulation of Forced Convection of Nanofluids by a Two-Component Nonhomogeneous Model JO - International Journal of Engineering JA - IJE LA - en SN - 1025-2495 AU - Kowsary, Farshad AU - Heyhat, Mohammad Mahdi AD - School of Mechanical Engineering, University of Tehran AD - Mech. Engr., Tarbiat Modares University Y1 - 2010 PY - 2010 VL - 23 IS - 1 SP - 89 EP - 99 KW - Nanofluids KW - Heat transfer enhancement KW - Non KW - Uniform Particle Distribution KW - Two KW - Component Model KW - Constant Wall Temperature DO - N2 - Nanofluids, in which nano-sized particles (typically less than 100 nm) are suspended in liquids, have emerged as a possible effective way of improving the heat transfer performance of common fluids. In this paper a numerical study is performed to analyze the wall shear stress and heat transfer coefficient of γAl2O3-water nanofluids under laminar forced convection through a circular pipe. It is assumed that the distribution of nanoparticles in the flow field is nonhomogeneous. The results obtained show that addition of γAl2O3 nanoparticles to pure water effectively enhances the convective heat transfer. Moreover, the wall shear stresses are increased. The increasing rate of heat transfer depends on the volume concentration such that for the lowest and highest values of particle volume concentration 0.03 and 0.05, considered in this study, the heat transfer enhancement is approximately 23% and 40%, respectively. Also, compared with the available experimental data, the model used in this work is capable to predict the increasing rate of heat transfer of nanofluids properly. UR - https://www.ije.ir/article_71838.html L1 - https://www.ije.ir/article_71838_7b9c84a88c3b637c4302f0ebcf841925.pdf ER -