Purpose

This paper aims to numerically investigate the thermal performance evaluation of a microchannel with different porous media insert configurations.

Design/methodology/approach

Heat transfer and pressure drop of fluid flow through a three-dimensional (3D) microchannel with different partially and filled porous media insert configurations are investigated numerically. The number of divisions and positions of porous material inside the microchannel for 12 different arrangements are considered. A control volume method is used for single-phase laminar flow with the Darcy–Forchheimer model used for the porous media. The geometry of the problem consists of a microchannel with a rectangular cross-section of 0.4 mm × 0.2 mm and length 20 mm, with a stainless steel porous material insert with a porosity coefficient of ε = 0.32 and a Darcy number of Da = 2.7 × 10⁻⁴.

Findings

Numerical results show that when the transverse arrangement is used, as the number of partitions increases, the thermal performance is improved and the heat transfer increases up to 300% compared to that of the plain microchannel. Comparing the obtained results from the microchannels with transverse and longitudinal configurations, at low Reynolds numbers, the transverse arrangement of porous blocks and at high Reynold numbers, the longitudinal arrangement present the best thermal performance which is virtually four times higher compared to the obtained Nu numbers from the plain microchannel. The results show that as the volume of porous material is constant in the cases with various transverse porous blocks, the pressure drop is not changed in these cases. Also, the highest thermal performance ratio is when the porous material is placed along the walls in a longitudinal direction.

Originality/value

To the best knowledge of the authors, in the previous research, the effect of the arrangement and location of the porous medium in the transverse and longitudinal direction in the microchannel and their effect in different states on the behavior of flow and heat transfer has not been numerically investigated. In this study, the porous media configuration and its placement in a 3D microchannel were numerically studied. The effect of porous material layout and configurations in different longitudinal and transverse directions on the pressure drop, heat transfer and thermal performance in the 3D microchannel is investigated numerically.

中文翻译：

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具有不同多孔介质插入配置的微通道的热性能评估

目的

本文旨在数值研究具有不同多孔介质插入配置的微通道的热性能评估。

设计/方法/方法

数值研究了流体通过具有不同部分填充和填充多孔介质插入配置的三维 (3D) 微通道的传热和压降。考虑了 12 种不同排列的微通道内的多孔材料的划分数量和位置。控制体积法用于单相层流，Darcy-Forchheimer 模型用于多孔介质。该问题的几何结构包括一个矩形横截面为 0.4 mm × 0.2 mm、长度为 20 mm 的微通道，以及一个孔隙系数 ε = 0.32 和达西数 Da = 2.7 × 的不锈钢多孔材料插件10 ^-4。

发现

数值结果表明，当采用横向布置时，随着隔板数量的增加，热性能得到改善，与普通微通道相比，传热提高了300%。比较从具有横向和纵向配置的微通道获得的结果，在低雷诺数、多孔块的横向排列和高雷诺数下，纵向排列呈现出最佳的热性能，与获得的 Nu 数相比几乎高出四倍来自普通的微通道。结果表明，由于多孔材料的体积在具有各种横向多孔块的情况下是恒定的，因此在这些情况下压降没有变化。还，

原创性/价值

据作者所知，在之前的研究中，多孔介质在微通道中的横向和纵向的排列和位置以及它们在不同状态下对流动和传热行为的影响尚未得到证实。数值研究。在这项研究中，对多孔介质配置及其在 3D 微通道中的位置进行了数值研究。数值研究了多孔材料在不同纵向和横向的布局和配置对3D微通道中压降、传热和热性能的影响。