Performance optimization of water-Al2O3 nanofluid flow and heat transfer in trapezoidal cooling microchannel using constructal theory and two phase Eulerian-Lagrangian approach

被引:37
作者
Khodabandeh, Erfan [1 ]
Abbassi, Abbas [1 ]
机构
[1] Amirkabir Univ Technol, Mech Engn Dept, 424 Hafez Ave,POB 15875-4413, Tehran, Iran
关键词
Constructal theory; Microchannel; Nano-particle; Trapezoidal; Eulerian-Lagrangian; Tow phase method; DEVELOPED FORCED-CONVECTION; THERMOPHYSICAL PROPERTIES; ARC FURNACE; SINK; CHANNELS; POWER;
D O I
10.1016/j.powtec.2017.09.046
中图分类号
TQ [化学工业];
学科分类号
0817 ;
摘要
In this study, the performance of micro heat sink with nanofluid of water-Al2O3 of 1% and the optimum geometry dimensions are evaluated in the trapezoidal microchannel by using constructal theory and the two-phase Eulerian-Lagrangian method. Also, the optimal microchannel diameter obtained with the intersection of asymptotes method, was compared with the numerical state. The results show that for a constant pressure drop, microchannel with a 70 degrees side angle in the optimum state, has the maximum total thermal conductivity in the dimensionless state. In addition, by reducing the side angle of the trapezoidal cross-section, the total thermal conductivity would be reduced in a dimensionless state. The maximum thermal conductivity in a trapezoidal microchannel will happen in the volume fraction range of 0.4 <=eta <= 0.5. The maximum and minimum error between numerical and analytical study for the optimum hydraulic diameter is 47.54% and 32%, respectively. (C) 2017 Elsevier B.V. All rights reserved.
引用
收藏
页码:103 / 114
页数:12
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