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Effect of a rotating cylinder in forced convection of ferrofluid over a backward facing step

机译:旋转圆柱体对铁磁流体在对向步骤后强制对流的影响

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摘要

In this study, numerical analysis of the heat transfer enhancement and fluid flow characteristics of a rotating cylinder under the influence of magnetic dipole in the backward facing step geometry is conducted. The governing equations are solved with a finite element based commercial solver. The effects of Reynolds number (10 ≤ Re ≤ 200), cylinder rotation angle (-75 ≤ Ω ≤ 75) and strength of the magnetic dipole (0 ≤ γ ≤ 16) on the heat transfer characteristics are studied for backward facing step flow. It is observed that the length and size of the recirculation zones can be controlled with magnetic dipole strength and cylinder rotation angles. As the Reynolds number increases, local Nusselt number increases and number of peaks in the presence of the magnetic field decreases. The effect of cylinder rotation on the local Nusselt number distribution is more pronounced at low Reynolds number.
机译:在这项研究中,对电磁偶极子影响下旋转圆柱体的传热增强和流体流动特性进行了数值分析。控制方程由基于有限元的商用求解器求解。研究了雷诺数(10≤Re≤200),圆柱旋转角(-75≤Ω≤75)和磁偶极子的强度(0≤γ≤16)对传热特性的影响。可以看出,可以通过磁偶极强度和圆柱旋转角度来控制再循环区的长度和大小。随着雷诺数增加,局部Nusselt数增加,并且在磁场存在下的峰数减少。在低雷诺数下,圆柱体旋转对局部Nusselt数分布的影响更为明显。

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