Purpose

This paper aims to focus on the analysis of the entropy generation in an inclined square cavity filled with a porous media saturated by a nanofluid with sinusoidal temperature distribution on the side walls, adiabatic conditions on the upper wall and a heat source at the lower wall.

Design/methodology/approach

The two-phase nanofluid model including the Brownian diffusion and thermophoresis effects has been used for simulation of nanofluid transport inside the porous cavity. The governing equations and the entropy generation owing to fluid friction, heat and mass transfer are transformed in terms of the dimensionless variables, and the results are obtained by using the finite difference method of the second-order accuracy.

Findings

The numerical results of the model are investigated, and the effect of different important parameters, such as inclination angle of the cavity, amplitude ratio of the sinusoidal temperature or phase deviation, is discussed. The results for no inclination of the cavity is compared and successfully validated with previous reported results of the literature. The important findings of the study are focused mainly on the existence of the irreversibility phenomena which are affected by the conditions of the model and the values of the studied parameters.

Originality/value

The originality of this work is given by the presented mathematical model, the numerical solution with new results for entropy generation in an inclined porous cavity filled by a nanofluid and the applications for design of electronic or energy devices.

中文翻译：

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多孔腔中纳米流体的熵产生，壁处为正弦温度，热源为波纹管

目的

本文旨在重点分析倾斜方腔中的熵生成，该方腔充满多孔介质，其侧壁为正弦温度分布的纳米流体，上壁为绝热条件，下壁为热源。

设计/方法/方法

包括布朗扩散和热泳效应的两相纳米流体模型已用于模拟多孔腔内的纳米流体传输。将控制方程和流体摩擦传热传质的熵产生转化为无量纲变量，利用二阶精度的有限差分法得到结果。

发现

研究了模型的数值结果，讨论了不同重要参数的影响，如腔倾角、正弦温度的幅值比或相位偏差。将空腔无倾斜的结果与之前报道的文献结果进行比较并成功验证。研究的重要发现主要集中在受模型条件和研究参数值影响的不可逆现象的存在上。

原创性/价值

这项工作的独创性在于所提出的数学模型、在由纳米流体填充的倾斜多孔腔中熵产生的新结果的数值解以及在电子或能源设备设计中的应用。