Purpose

The purpose of this study is to use the incompressible smoothed particle hydrodynamics method to examine the influences of a magnetic field on the double-diffusive convection caused by a rotating circular cylinder with paddles within a square cavity filled by a nanofluid.

Design/methodology/approach

The cavity is saturated by two wavy layers of non-Darcy porous media with a variable amplitude parameter. The embedded circular cylinder with paddles carrying T_h and C_h is rotating around the cavity center by a uniform circular velocity.

Findings

The lineaments of nanofluid velocity and convective flow, as well as the mean of Nusselt and Sherwood numbers, are represented below the variations on the frequency parameter, amplitude parameter of the wavy porous layers, Darcy parameter, nanoparticles parameter, Hartmann number and Ryleigh number. The performed simulations showed the role of paddles mounted on circular cylinders for enhancing the transmission of heat and mass within a cavity. The wavy porous layers at the lower Darcy parameter are playing as a blockage for the nanofluid flow within the porous area. Increasing the concentration of the nanoparticles to 6% reduces the maximum flow speed by 8.97% and maximum streamlines |ψ|_max by 10.76%. Increasing Hartmann number to 100 reduces the maximum flow speed by 65.83% and |ψ|_max by 75.54%.

Originality/value

The novelty of this work is to examine the effects of an inclined magnetic field and rotating novel shape of a circular cylinder with paddles on the transmission of heat/mass in the interior of a nanofluid-filled cavity saturated by undulating porous medium layers.

中文翻译：

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磁场对多孔介质波状层饱和空腔中纳米流体双扩散对流的影响：ISPH 分析

目的

本研究的目的是使用不可压缩平滑粒子流体动力学方法来检查磁场对由旋转圆柱体引起的双扩散对流的影响，该圆柱体在填充有纳米流体的方形腔内具有桨叶。

设计/方法/方法

空腔被两个具有可变振幅参数的非达西多孔介质波状层所饱和。带有桨叶的​​嵌入式圆柱体携带 T_h 和 C_h 以匀速圆周速度围绕腔中心旋转。

发现

在频率参数、波状多孔层的振幅参数、达西参数、纳米粒子参数、哈特曼数和瑞利数的变化下，表示了纳米流体速度和对流的曲线，以及努塞尔数和舍伍德数的平均值。所进行的模拟显示了安装在圆柱体上的桨叶在增强腔内热量和质量传递方面的作用。在较低的达西参数处的波浪状多孔层对多孔区域内的纳米流体流动起到了阻碍作用。将纳米粒子的浓度增加到 6% 会使最大流速降低 8.97% 和最大流线 |ψ| _最大10.76%。将 Hartmann 数增加到 100 会使最大流速降低 65.83% 和 |ψ| _最大限度 75.54%。

原创性/价值

这项工作的新颖之处在于检查倾斜磁场和旋转新颖形状的带有桨叶的​​圆柱体对由起伏的多孔介质层饱和的纳米流体填充腔内部的热量/质量传递的影响。