Purpose

This paper aims to exhibit a numerical study to analyze the influence of a periodic magnetic source on free convection flow and entropy generation of a ferrofluid in a baffled cavity. In this study, ferrofluid nanofluid was selected due to its ability to image magnetic domain structures within the cavity. The non-uniform magnetic source is considered as a sinusoidal distribution in the vertical direction.

Design/methodology/approach

The finite volume technique is used to evaluate the steady two-dimensional partial differential equations that govern the flow with its corresponding boundary conditions.

Findings

The obtained results indicate that a significant increase in the average Nusselt number can be achieved with the use of the periodic magnetic source instead of a uniform case. In addition, the effectiveness of the adiabatic baffle notably depends on its position and Rayleigh number. Regardless of the values of period and Hartmann numbers, the periodic magnetic source has a higher entropy generation and lower Bejan number than the uniform magnetic source.

Originality/value

The novelty of this research lies in applying a periodic magnetic source on the natural convection of ferrofluids in a baffled cavity.

中文翻译：

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周期性磁源对折流腔内铁磁流体自然对流和熵产生的影响

目的

本文旨在通过数值研究来分析周期性磁源对挡板腔中铁磁流体的自由对流和熵产生的影响。在这项研究中，选择铁磁流体纳米流体是因为它能够对腔内的磁畴结构进行成像。不均匀的磁源被认为是垂直方向上的正弦分布。

设计/方法/方法

有限体积技术用于评估控制流动的稳态二维偏微分方程及其相应的边界条件。

发现

获得的结果表明，使用周期性磁源代替均匀情况可以实现平均努塞尔数的显着增加。此外，绝热挡板的有效性主要取决于其位置和瑞利数。无论周期和哈特曼数的值如何，周期磁源比均匀磁源具有更高的熵生成和更低的贝扬数。

原创性/价值

这项研究的新颖之处在于将周期性磁源应用于挡板腔中铁磁流体的自然对流。