Magnetohydrodynamic Natural Convection of In-Ga-Sn Alloy in a Horizontal Concentric Annulus with Internal Fins

Aidan Hickie-Bentzen, S. Tasnim, S. Mahmud
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Abstract

- The use of low melting point liquid metals in the thermal management of various systems has seen a recent increase in popularity with the increasing power of commercial CPUs. Natural convection in concentric annuli has also been a popular topic in the literature for decades due to the applications in nanotechnology and energy storage systems. In this study, numerical simulations are performed to investigate magnetohydrodynamic natural convection heat transfer in a horizontal concentric annulus with internal straight, Y-shapes, and T-shaped fins approximated as thin layers. A mix of transient and steady state simulations are conducted using COMSOL Multiphysics® with constant temperature boundary conditions to generate laminar natural convection profiles in the enclosure filled with a eutectic In-Ga-Sn alloy. The average Nusselt number (Nu) at the outer boundary is calculated to compare all simulation results. The Rayleigh number (Ra) is varied to investigate the stability of the flow profile over time, first without fins and then with straight fins. The three fin geometries are then compared at various Ra values to gauge their relative performance, and lastly the magnetic field is implemented at constant Ra for various Hartmann numbers (Ha). The fins are found to increase the stability of the flow profile over time, while the Y-shaped fins increase Nu by up to 318.7% compared to no fins at Ra = 10 4 . The magnetic field forces more even heat dissipation through the enclosure, and at Ha = 20, Nu increases by a further 78.1% for the Y-shaped fins at Ra = 10 4 .
in - ga - sn合金在带内翅片的水平同心环内的磁流体力学自然对流
-随着商用cpu功率的不断提高,在各种系统的热管理中使用低熔点液态金属最近越来越受欢迎。由于在纳米技术和储能系统中的应用,同心环空中的自然对流也是几十年来文献中的热门话题。在这项研究中,数值模拟研究了磁流体动力学自然对流换热在一个水平同心环空,内部直线型,y形和t形翅片近似为薄层。使用COMSOL Multiphysics®进行瞬态和稳态混合模拟,并具有恒温边界条件,以在填充共晶in - ga - sn合金的外壳中生成层流自然对流剖面。计算外边界处的平均努塞尔数(Nu)以比较所有模拟结果。通过改变瑞利数(Ra)来研究流型随时间的稳定性,首先是无翅片,然后是直翅片。然后将三种翅片几何形状在不同的Ra值下进行比较,以衡量它们的相对性能,最后在恒定的Ra下对不同的哈特曼数(Ha)实施磁场。随着时间的推移,鳍片增加了流型的稳定性,而在Ra = 104时,与没有鳍片相比,y形鳍片使Nu增加了318.7%。磁场使散热更加均匀,当Ha = 20时,y形翅片的Nu在Ra = 10时又增加了78.1%。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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