Gal Soulayma, Kolsi Lioua, Hassen Walid, Ben Ali Naim, Ben Khedher Nidhal, Chamkha Ali J
Laboratory of Metrology and Energy systems, Monastir, University of Monastir, 5000 Monastir, Tunisia.
Mechanical Engineering Department, College of Engineering, University of Ha'il, 81451 Ha'il City, Saudi Arabia.
ACS Omega. 2022 Mar 31;7(14):12365-12373. doi: 10.1021/acsomega.2c00923. eCollection 2022 Apr 12.
This article provides a numerical study on carbon nanotube-water nanofluid convection in a three-dimensional cavity under a magnetic field effect. Two walls are kept at a hot temperature, and the upper and lower horizontal walls are considered adiabatic. As a new configuration, the beneficial effect of using a nanofluid is coupled with the incorporation of cold V-shape obstacle placed in the cubic cavity; in addition, an external magnetic field is applied toward the horizontal -axis direction. The finite element method based on the Galerkin's Weighted Residual technique is used to solve the three-dimensional governing equations. In this paper, the ranges of the parameters used are the Hartmann number, varied from 0 to 100, Rayleigh number from 10 to 10, nanofluid volume fraction between 0% and 4.5%, and the body V-shaped opening angle varied from 0 to 80°. The effect of the obstacle shape and the added nanoparticle concentration on the flow behaviors, the different instabilities generated, and the heat transfer exchanged were exposed. An enhancement in heat transfer was recorded by increasing the obstacle opening angle and the volume fraction of the carbon nanotubes. Special attention has also been devoted to the calculation of the different kinds of entropy generations.
本文对磁场作用下三维空腔内碳纳米管-水纳米流体对流进行了数值研究。两侧壁保持高温，上下水平壁视为绝热。作为一种新的结构，使用纳米流体的有益效果与置于立方腔内的冷V形障碍物相结合；此外，还施加了一个沿水平轴方向的外部磁场。基于伽辽金加权残值技术的有限元方法用于求解三维控制方程。本文中使用的参数范围为：哈特曼数从0到100，瑞利数从10^3到10^6，纳米流体体积分数在0%到4.5%之间，物体V形开口角度从0到80°。揭示了障碍物形状和添加的纳米颗粒浓度对流动行为、产生的不同不稳定性以及交换的热传递的影响。通过增加障碍物开口角度和碳纳米管的体积分数，记录到了热传递的增强。还特别关注了不同种类熵产生的计算。
