Numerical investigation of effects of uniform magnetic field on heat transfer around a sphere

Abbasi Zeinab; Molaei Dehkordi Asghar; Abbasi Fateme

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Numerical investigation of effects of uniform magnetic field on heat transfer around a sphere

机译：均匀磁场对球体传热影响的数值研究

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In this article, ferrohydrodynamic forced-convection heat transfer from a heated sphere embedded in a ferrofluid in the presence of the uniform external magnetic field has been studied numerically for the first time over a wide range of Reynolds number value, nanoparticle diameter, particle volume fraction, and magnetic field intensity. Despite the uniform external magnetic field applied, the internal magnetic field near the sphere could be nonuniform due to the considerable difference between the relative magnetic permeability of the sphere and the surrounding medium. Kelvin body force arises from this nonuniformity and induces vortexes near the sphere. These vortexes disturb the boundary layer, decrease the heat-transfer resistance, and enhance the heat-transfer rate. Variations of the local Nusselt number value were investigated to examine the effects of aforementioned parameters. The obtained simulation results indicate that the average Nu value strongly depends on the magnetic field intensity. Furthermore, the simulation results obtained for drag coefficient and Nu values were validated against those reported in the literature in the absence of magnetic field. The obtained simulation results were successfully correlated with Reynolds and Prandtl numbers.

机译：在本文中，首次在广泛的雷诺数值，纳米粒子直径，粒子体积分数的范围内，进行了数值研究，研究了在均匀外部磁场存在下，从嵌入铁磁流体中的加热球体获得的铁流体动力强迫对流传热。，以及磁场强度。尽管施加了均匀的外部磁场，但由于球体与周围介质的相对磁导率之间存在相当大的差异，因此球体附近的内部磁场可能会不均匀。开尔文体力源自这种不均匀性，并在球体附近引起涡旋。这些涡旋干扰边界层，降低了传热阻力，并提高了传热速率。研究了局部Nusselt值的变化，以检验上述参数的影响。所获得的模拟结果表明，平均Nu值在很大程度上取决于磁场强度。此外，针对阻力系数和Nu值获得的仿真结果与文献报道的在没有磁场的情况下的结果进行了验证。获得的仿真结果已成功与雷诺数和Prandtl数相关。

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来源
《International Journal of Heat and Mass Transfer》 |2017年第11期|703-714|共12页
作者
Abbasi Zeinab; Molaei Dehkordi Asghar; Abbasi Fateme;
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作者单位

Department of Chemical and Petroleum Engineering, Sharif University of Technology, P.O. Box 11155-9465, Tehran, Iran;

Department of Chemical and Petroleum Engineering, Sharif University of Technology, P.O. Box 11155-9465, Tehran, Iran;

Department of Chemical and Petroleum Engineering, Sharif University of Technology, P.O. Box 11155-9465, Tehran, Iran;

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收录信息美国《科学引文索引》(SCI);美国《工程索引》(EI);
原文格式 PDF
正文语种 eng
中图分类
关键词
Ferrohydrodynamics; Forced -convection heat transfer; Magnetic field; Magnetic nanoparticles;

机译：铁流体动力学;强制对流换热;磁场;磁性纳米粒子;

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Numerical investigation of effects of uniform magnetic field on heat transfer around a sphere

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