Abstract Magnetohydrodynamics forced convection of CNT-water nanofluid in a layered U-shaped vented cavity involving a porous region is investigated under the impact of wall corrugation. The numerical study is performed by using the finite volume method. Impacts of Reynolds number (between 100 and 1000), Hartmann number (between 0 and 50), Darcy number (between 10−4 and 5 × 10−2), porous layer height (between 0.1H and 0.5H), height (between 0 and 0.5H) and number of triangular waves (between 1 and 16) and curvature (between 0.01H and 0.2H) at the U-turn of the vented cavity on the convective heat transfer features are examined. The flow field and heat transfer are affected by variations in the Reynolds number, magnetic field strength and permeability of the porous medium. The average Nusselt number increases significantly with higher magnetic field strength and at Hartmann number of 50, the amount of enhancement is 112% while the impact is reverse for highest value of Darcy number of the porous compound. The corrugation of the bottom wall which is a triangular wave was found to be used as an effective tool for fluid flow and heat transfer features. The average heat transfer rate reduces with higher number of corrugation waves (68.2% reduction) while it first increases then reduces with higher height of the corrugation. The curvature of the neck in the U-shaped cavity reduced the heat transfer rate which is 15.5% at the highest value.

中文翻译：

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考虑壁波纹效应的具有多孔区域的多层U形通风腔中纳米流体的磁流体动力学强制对流

摘要 研究了在壁波纹的影响下，碳纳米管-水纳米流体在涉及多孔区域的分层 U 形通风腔中的磁流体力学强制对流。数值研究是通过使用有限体积法进行的。雷诺数（介于 100 和 1000 之间）、哈特曼数（介于 0 和 50 之间）、达西数（介于 10-4 和 5 × 10-2 之间）、多孔层高度（介于 0.1H 和 0.5H 之间）、高度（介于0 和 0.5H）和三角波的数量（1 和 16 之间）和曲率（0.01H 和 0.2H 之间）在对流热传递特征上通风腔的 U 形转弯处进行了检查。流场和传热受雷诺数、磁场强度和多孔介质渗透率变化的影响。平均努塞尔数随着磁场强度的增加而显着增加，在哈特曼数为 50 时，增强量为 112%，而对多孔化合物的达西数最高值的影响则相反。发现作为三角波的底壁波纹被用作流体流动和传热特征的有效工具。平均传热率随着波纹波数的增加而降低（减少 68.2%），而随着波纹高度的增加，它首先增加然后降低。U 型腔中颈部的曲率降低了传热率，最高值为 15.5%。发现作为三角波的底壁波纹被用作流体流动和传热特征的有效工具。平均传热率随着波纹波数的增加而降低（减少 68.2%），而随着波纹高度的增加，它首先增加然后降低。U 型腔中颈部的曲率降低了传热率，最高值为 15.5%。发现作为三角波的底壁波纹被用作流体流动和传热特征的有效工具。平均传热率随着波纹波数的增加而降低（减少 68.2%），而随着波纹高度的增加，它首先增加然后降低。U 型腔中颈部的曲率降低了传热率，最高值为 15.5%。