Purpose

The purpose of this study is to analyze the nonhomogeneous model on the mixed convection of Al2O3–Fe3O4 Bingham plastic hybrid nanofluid in a ventilated enclosure subject to an externally imposed uniform magnetic field. Entropy generation and the pressure drop are determined to analyze the performance of the heat transfer. The significance of Joule heating arising due to the applied magnetic field on the heat transfer of the yield stress fluid is described.

Design/methodology/approach

The ventilation in the enclosure of heated walls is created by an opening on one vertical wall through which cold fluid is injected and another opening on the opposite vertical wall through which fluid can flow out.

Findings

This study finds that the inclusion of Fe₃O₄ nanoparticles with the Al₂O₃-viscoplastic nanofluid augments the heat transfer. This rate of enhancement in heat transfer is higher than the rate by which the entropy generation is increased as well as the enhancement in the pressure drop. The yield stress has an adverse effect on the heat transfer; however, it favors thermal mixing. The magnetic field, which is acting opposite to the direction of the inlet jet, manifests heat transfer of the viscoplastic hybrid nanofluid. The horizontal jet of cold fluid produces the optimal heat transfer.

Originality/value

The objective of this study is to analyze the impact of the inclined cold jet of viscoplastic electrically conducting hybrid nanofluid on heat transfer from the enclosure in the presence of a uniform magnetic field. The combined effect of hybrid nanoparticles and a magnetic field to enhance heat transfer of a viscoplastic fluid in a ventilated enclosure has not been addressed before.

中文翻译：

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与通过在通风外壳中的宾厄姆塑料流体的混合对流中施加磁场和混合纳米粒子产生的熵相比，传热增强

目的

本研究的目的是分析 Al2O3–Fe3O4 Bingham 塑料混合纳米流体在外部施加均匀磁场的通风外壳中混合对流的非均匀模型。确定熵产生和压降以分析传热性能。描述了由于施加的磁场对屈服应力流体的传热而产生的焦耳热的重要性。

设计/方法/方法

加热壁的外壳中的通风是由一个垂直壁上的一个开口产生的，冷流体通过该开口注入，另一个垂直壁上的另一个开口通过该开口流体可以流出。

发现

本研究发现，将 Fe ₃ O ₄纳米颗粒与 Al ₂ O ₃ -粘塑性纳米流体结合可增强传热。这种热传递的增强速率高于熵产生增加的速率以及压降的增强。屈服应力对传热有不利影响；然而，它有利于热混合。与入口射流方向相反的磁场表现出粘塑性混合纳米流体的热传递。冷流体的水平射流产生最佳的热传递。

原创性/价值

本研究的目的是分析在存在均匀磁场的情况下，粘塑性导电混合纳米流体的倾斜冷射流对外壳传热的影响。混合纳米粒子和磁场的组合效应以增强通风外壳中粘塑性流体的传热，以前没有得到解决。