Purpose

The purpose of this paper is to investigate the effects of Ha and the Nanoparticles (NP) volume fraction over the irreversibility and heat transport in Darcy–Forchheimer nanofluid saturated lid-driven porous medium.

Design/methodology/approach

The present paper highlights entropy generation because of mixed convection for a lid-driven porous enclosure filled through a nanoliquid and submitted to a uniform magnetic field. The analysis is achieved using Darcy–Brinkman–Forchheimer technique. The set of partial differential equations governing the considered system was numerically solved using the finite element method.

Findings

The main observations are as follows. The results indicate that the movement of horizontal wall is an important factor for the entropy generation inside the porous cavity filled through Cu–water nanoliquid. The variation of the thermal entropy generation is linear through NPs volume fraction. The total entropy generation reduces when the Darcy, Hartmann and the nanoparticle volume fraction increase. The porous media and magnetic field effects reduce the total entropy generation.

Practical implications

Interest in studying thermal interactions by convective flow within a saturating porous medium has many fundamental considerations and has received extensive consideration in the literature because of its usefulness in a large variety of engineering applications, such as the energy storage and solar collectors, crystal growth, food processing, nuclear reactors and cooling of electronic devices, etc.

Originality/value

By examining the literature, the authors found that little attention has been paid to entropy generation encountered during convection of nanofluids. Hence, this work aims to numerically study entropy generation and heat transport in a lid-driven porous enclosure filled with a nanoliquid.

中文翻译：

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Cu-水纳米液体在多孔盖驱动腔中通过磁场的熵产生和热传输

目的

本文的目的是研究 Ha 和纳米颗粒 (NP) 体积分数对 Darcy-Forchheimer 纳米流体饱和盖驱动多孔介质中不可逆性和热传输的影响。

设计/方法/方法

本论文重点介绍了通过纳米液体填充并置于均匀磁场中的盖子驱动的多孔外壳的混合对流产生的熵。该分析是使用 Darcy-Brinkman-Forchheimer 技术实现的。使用有限元方法对控制所考虑系统的偏微分方程组进行数值求解。

发现

主要观察如下。结果表明，水平壁的运动是通过Cu-水纳米液体填充的多孔腔内熵产生的重要因素。热熵生成的变化通过 NPs 体积分数是线性的。当达西、哈特曼和纳米粒子体积分数增加时，总熵产生减少。多孔介质和磁场效应减少了总熵的产生。

实际影响

对通过饱和多孔介质内的对流流动研究热相互作用的兴趣具有许多基本考虑因素，并且由于其在各种工程应用中的有用性，例如能量存储和太阳能收集器、晶体生长、食品处理、核反应堆和电子设备的冷却等。

原创性/价值

通过查阅文献，作者发现很少关注纳米流体对流过程中遇到的熵产生。因此，这项工作旨在数值研究充满纳米液体的盖子驱动的多孔外壳中的熵产生和热传递。