Examining of nanofluid natural convection heat transfer in a Γ-shaped enclosure including a rectangular hot obstacle using the lattice Boltzmann method

被引:61
|
作者
Mohebbi, Rasul [1 ]
Izadi, Mohsen [2 ]
Sajjadi, Hasan [3 ]
Delouei, Amin Amiri [3 ]
Sheremet, Mikhail A. [4 ]
机构
[1] Damghan Univ, Sch Engn, POB 3671641167, Damghan, Iran
[2] Lorestan Univ, Dept Mech Engn, Fac Engn, Khorramabad, Iran
[3] Univ Bojnord, Dept Mech Engn, Fac Engn, Bojnord 9453155111, Iran
[4] Tomsk State Univ, Lab Convect Heat & Mass Transfer, Tomsk 634050, Russia
关键词
Gamma-shaped enclosure; Hot obstacle; LBM; Streamlines; Isotherms; Heat transfer rate; Nanofluid; FORCING IMMERSED BOUNDARY; POWER-LAW FLUID; MIXED-CONVECTION; NUMERICAL-SIMULATION; SQUARE CAVITY; TRANSFER AUGMENTATION; FORCED-CONVECTION; FLOW; CHANNEL; CYLINDER;
D O I
10.1016/j.physa.2019.04.067
中图分类号
O4 [物理学];
学科分类号
0702 ;
摘要
The present investigation is set to evaluate the nanofluid thermogravitational convection within a Gamma-shaped enclosure that consists of a local heater by the lattice Boltzmann method (LBM). In this study the Rayleigh number (10(3)-10(6)), cavity's aspect ratio (0.2-0.6), nanofluid solid volume fraction (0-0.05), height and location of the heater on the liquid circulation and heat transfer parameters examined with respect to the Gamma-shaped enclosure. The study is innovated in nature as it combines the nanofluid and the hot obstacle within the same Gamma-shaped enclosure. The results of the conducted analyses indicate that the mean Nusselt number would increase as the Rayleigh number and nanoparticles concentration increased. This resulted in a reduction in the enclosure aspect ratio and increment in the obstacle's height. The thermal transmission rate is highly affected by the obstacle's position. Also, it is found that, when the heater is situated on the left border, the mean Nusselt number would be maximized. (C) 2019 Elsevier B.V. All rights reserved.
引用
收藏
页数:20
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