Numerical study of natural convection heat transfer in a heat exchanger filled with nanofluids

被引:83
作者
Garoosi, Faroogh [1 ,2 ]
Hoseininejad, Faraz [2 ]
Rashidi, Mohammad Mehdi [3 ,4 ]
机构
[1] Univ Semnan, Dept Mech Engn, Semnan, Iran
[2] Islamic Azad Univ, Aliabad Katoul Branch, Dept Mech Engn, Aliabad Katoul, Iran
[3] Shanghai Key Lab Vehicle Aerodynam & Vehicle Ther, 4800 Cao An Rd, Shanghai 201804, Peoples R China
[4] ENN Tongji Clean Energy Inst Adv Studies, Shanghai, Peoples R China
关键词
Natural convection; Nanofluid; Heater; Cooler; Circular cylinder; Heat exchanger; INCLINED SQUARE ENCLOSURE; ENTROPY GENERATION; WAVY-WALL; MIXED CONVECTION; POROUS-MEDIA; SIMULATION; FLOW; CYLINDERS; CAVITY; MIXTURE;
D O I
10.1016/j.energy.2016.05.051
中图分类号
O414.1 [热力学];
学科分类号
摘要
Natural convection of nanofluids around several pairs of hot and cold cylinders in an adiabatic enclosure is investigated numerically. Hot and cold cylinders are maintained at the different constant temperatures (T-h > Tc) while the walls of the enclosure are thermally insulated. A parametric study is undertaken to explore the effects of the pertinent parameters, such as; Rayleigh number, size and type of the nano particles, shape of the enclosure, orientation and number of the hot and cold cylinders on the fluid flow and heat transfer characteristic. The simulations show that at low Ra, by changing shape of the enclosure from square to triangular one, the heat transfer rate decreases. It is also found that at each Ra, there is an optimum volume fraction of nanoparticles (phi(opt)) where the heat transfer rate within the enclosure has a maximum value. Moreover, the results of this study showed by altering orientation of the hot and" cold cylindeis from horizontal to vertical mode, the heat transfer rate enhances. Finally, the results indicated that, by decreasing the size of the nanoparticles, the heat transfer rate and optimal particle loading (phi opt) enhances. (C) 2016 Elsevier Ltd. All rights reserved.
引用
收藏
页码:664 / 678
页数:15
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