撞击射流冷却和热辐射对半圆形多孔通道中磁流体动力混合对流和熵产的影响

IF 4 3区 工程技术 Q1 MATHEMATICS, INTERDISCIPLINARY APPLICATIONS
Aniket Halder, Arabdha Bhattacharya, Mikhail A. Sheremet, Nirmalendu Biswas, Nirmal K. Manna, Dipak Kumar Mandal, Ali J. Chamkha
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引用次数: 0

摘要

目的研究考虑冲击射流冷却和热辐射影响的半圆形多孔通道内的磁流体混合对流现象和熵的产生。本研究在前人研究的基础上,分析了高度稀释的0.1%(体积)浓度Cu-Al2O3 /水混合纳米流体的复杂流动动力学和传热特性。该调查旨在支持在不同行业开发有效的热管理系统,例如电子设备的冷却和增强的能源系统应用。设计/方法/方法本研究采用加热弯曲底壁和Cu-Al2O3 /水混合纳米流体的冷却射流,从中央顶部入口撞击,沿矩形管道有两个水平出口。使用COMSOL Multiphysics进行基于有限元的模拟,使用的是经过早期工作验证的单相均匀模型。该方法使用有效导热系数和粘度的实验数据,强调在复杂几何和多物理条件下的热性能评估。在保持纳米流体体积分数恒定的情况下,研究分析了雷诺数(Re)、修正瑞利数(Ram)、哈特曼数(Ha)、达西数(Da)和辐射参数等非量变项。为了保证数值精度,进行了网格独立性研究和代码验证。结果表明,Re的升高使热边界层厚度减小,促使气流分离,显著增大平均努塞尔数。混合对流换热增强,加上总熵生成的总体减少,随着Ha的增加而减弱。然而,更高的Ram和Da值的优化组合提高了传热性能,特别是随着Ha的增加而显著提高。辐射传热对传热和熵产都有不利的影响。虽然单相模型捕获了区分纳米流体与基础流体的关键宏观效应,但它不能提供纳米颗粒水平的见解。未来的研究可以结合两相模型来捕捉粒子水平的分散效应。此外,实验验证的发现将加强研究的结论。独创性/价值这项工作代表了开发高效热液系统的创新观点,考虑了热辐射、多孔介质和复杂几何结构中的混合纳米流体的影响。研究结果为提高实际应用中的传热效率提供了重要见解,特别是在需要先进冷却解决方案的行业。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Effect of impinging jet cooling and thermal radiation on magnetohydrodynamic mixed convection and entropy generation in a semicircular porous channel

Purpose

This study aims to examine magnetohydrodynamic mixed convective phenomena and entropy generation within a semicircular porous channel, incorporating impinging jet cooling and the effects of thermal radiation. The present study analyzes the complex flow dynamics and heat transfer characteristics of a highly diluted 0.1% (volume) concentration Cu–Al2O3/water hybrid nanofluid, based on findings from previous studies. The investigation is intended to support the development of effective thermal management systems across diverse industries, such as cooling of electronic devices and enhanced energy system applications.

Design/methodology/approach

This study incorporates a heated curved bottom wall and a cooling jet of Cu–Al2O3/water hybrid nanofluid impinging from the central top inlet, with two horizontal exit ports along the rectangular duct. Finite element-based simulations are conducted using COMSOL Multiphysics, using a single-phase homogeneous model justified by earlier works. This method uses experimental data of effective thermal conductivity and viscosity, emphasizing the evaluation of thermal performance in scenarios involving intricate geometries and multiphysical conditions. The study analyzes nondimensional variables such as Reynolds number (Re), modified Rayleigh number (Ram), Hartmann number (Ha), Darcy number (Da) and radiation parameter while maintaining a constant nanofluid volume fraction. A grid independence study and code validation were performed to ensure numerical accuracy.

Findings

The analysis indicates that elevated Re contribute to a lessening in the thermal boundary layer thickness, prompting flow separation and significantly amplifying the average Nusselt number. The mixed convective heat transfer enhancement, coupled with an overall reduction in total entropy generation, diminishes with a rising Ha. However, optimized combinations of higher values for modified Ram and Da yield improved heat transfer performance, particularly pronounced with increasing Ha. Radiative heat transfer exerts a detrimental impact on both heat transfer and entropy production.

Practical implications

While the single-phase model captures key macroscopic effects differentiating nanofluids from base fluids, it does not provide insights at the nanoparticle level. Future studies could incorporate two-phase models to capture particle-level dispersion effects. In addition, experimental validation of the findings would strengthen the study’s conclusions.

Originality/value

This work represents innovative perspectives on the development of efficient hydrothermal systems, accounting for the influences of thermal radiation, porous media and hybrid nanofluids within a complex geometry. The results offer critical insights for enhancing heat transfer efficiency in real-world applications, especially in sectors demanding advanced cooling solutions.

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来源期刊
CiteScore
9.50
自引率
11.90%
发文量
100
审稿时长
6-12 weeks
期刊介绍: The main objective of this international journal is to provide applied mathematicians, engineers and scientists engaged in computer-aided design and research in computational heat transfer and fluid dynamics, whether in academic institutions of industry, with timely and accessible information on the development, refinement and application of computer-based numerical techniques for solving problems in heat and fluid flow. - See more at: http://emeraldgrouppublishing.com/products/journals/journals.htm?id=hff#sthash.Kf80GRt8.dpuf
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