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首页> 外文期刊>International Journal of Heat and Mass Transfer >Entropy generation in mixed convection magnetohydrodynamic nanofluid flow in vertical channel
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Entropy generation in mixed convection magnetohydrodynamic nanofluid flow in vertical channel

机译：垂直通道内混合对流磁流体动力学纳米流体流动中的熵产生

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摘要

A numerical investigation is performed into the heat transfer performance and entropy generation characteristics of a mixed convection magnetohydrodynamic (MHD) flow of Al_2O_3-water nanofluid in a vertical asymmetrically-heated parallel-plate channel subject to viscous dissipation effects. In performing the analysis, the effects of the Lorentz force and Joule heating are modeled using the transverse momentum balance equation and energy balance equation, respectively. Moreover, the Hartmann number is assigned a value of Hm = 0 (no magnetic field) or Hm = 2 (weak magnetic field). The results show that the presence of the magnetic field increases the local Nusselt number at the hot wall. Moreover, the enhancement in the heat transfer performance increases with an increasing nanoparticle concentration. The local Nusselt number at the cold wall also increases with an increasing nanoparticle concentration. However, for a constant particle concentration, the Nusselt number reduces given the application of a magnetic field. Finally, the average entropy generation number also reduces when a magnetic field is applied.
机译：数值研究了垂直非对称加热平行平板通道中Al_2O_3-水纳米流体的混合对流磁流体动力学（MHD）流动的粘滞耗散效应。在进行分析时，分别使用横向动量平衡方程和能量平衡方程对洛伦兹力和焦耳热的影响进行建模。此外，哈特曼数被分配为Hm = 0（无磁场）或Hm = 2（弱磁场）的值。结果表明，磁场的存在会增加热壁处的局部Nusselt数。而且，随着纳米颗粒浓度的增加，传热性能的增强也增加。随着纳米粒子浓度的增加，冷壁处的局部努塞尔数也增加。但是，对于恒定的粒子浓度，在施加磁场的情况下，努塞尔数减小。最后，当施加磁场时，平均熵产生数也减小。

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