分析磁性、焦耳加热和熵产生在充满铁磁流体的倾斜多孔介质中的相互作用

IF 2.3 3区工程技术 Q1 NUCLEAR SCIENCE & TECHNOLOGY

Annals of Nuclear Energy Pub Date : 2025-08-19 DOI:10.1016/j.anucene.2025.111801

Siam Abrar Saad , Srinivas Reddy Kallem , Siva Reddy Sheri , Sumon Saha

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引用次数: 0

摘要

本文研究了磁流体力学（MHD）、焦耳加热和熵生成在具有离散加热和冷却源的倾斜多孔方形腔内发热的fe3o4 -水铁磁流体的自然对流传热中的相互作用。了解这种复杂的相互作用对于优化核反应堆、电子冷却和过程工业等应用中的热系统至关重要，这些应用需要高效的传热和最小的不可逆性。本研究采用数值方法，利用Galerkin有限元法求解了多孔介质流动Darcy-Brinkman-Forchheimer模型下的二维Navier-Stokes方程和热能方程。参数化模拟在瑞利数（109≤Ra≤1012）、哈特曼数（0≤Ha≤50）、倾角（0°≤γ≤45°）、内部产热因子（0≤Δ≤1）和多孔材料（铜粉、砖和钠钙硅酸盐）范围内进行。主要研究结果表明，在高瑞利数和大倾角（高达62%）下，铁磁流体填充铜粉多孔畴的热性能得到显著改善。相反，内部热的产生降低了传热效率，增加了熵的产生。然而，由于多孔介质中铁磁流体运动受到抑制，MHD效应对系统整体效率的影响可以忽略不计。有趣的是，将多孔介质换成钠钙硅酸盐可以提高热效率（高达300%），并降低Ra≥5.5×1011的不可逆性（高达0.54%）。该研究独特地整合了MHD、焦耳加热、内部产热和多孔介质的影响，分析了倾斜的铁磁流体填充多孔腔中离散加热的热效率和不可逆性，以确定最佳配置，这超越了现有文献。

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Analyzing the interaction of magnetism, Joule heating, and entropy generation in an inclined porous media filled with ferrofluid

This study presents the interplay of magnetohydrodynamics (MHD), Joule heating, and entropy generation in the natural convection heat transfer of a heat-generating Fe₃O₄–water ferrofluid within an inclined porous square cavity featuring discrete heating and cooling sources. Understanding this complex interaction is vital for optimizing thermal systems in applications such as nuclear reactors, electronic cooling, and process industries, where efficient heat transfer and minimal irreversibility are anticipated. The research employs a numerical approach using the Galerkin finite element method to solve the two-dimensional Navier–Stokes and thermal energy equations under the Darcy–Brinkman–Forchheimer model for porous medium flow. Parametric simulations are conducted across a range of Rayleigh numbers (

1 0^{9} \leq R a \leq 1 0^{12}

), Hartmann numbers (

0 \leq H a \leq 50

), inclination angles (

0 ° \leq γ \leq 45 °

), internal heat generation factors (

0 \leq Δ \leq 1

), and porous materials (copper powder, brick, and soda-lime silicate). Key findings reveal that thermal performance improves significantly at higher Rayleigh numbers and greater inclination angles (up to 62%) in the ferrofluid filled copper powder porous domain. Conversely, internal heat generation reduces heat transfer efficiency and increases entropy generation. However, the MHD effect exerts negligible influence on the system’s overall efficiency due to suppressed ferrofluid motion in the porous medium. Interestingly, swapping porous medium to soda-lime silicate enhances thermal efficacy (up to 300%) and reduces irreversibilities (up to 0.54%) for

R a \geq 5.5 \times 1 0^{11}

. This study uniquely integrates the effect of MHD, Joule heating, internal heat generation, and porous media analyzing thermal efficacy and irreversibilities in an inclined ferrofluid-filled porous chamber with discrete heating to identify optimal configurations, which advances beyond existing literature.

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来源期刊

Annals of Nuclear Energy 工程技术-核科学技术

CiteScore

4.30

自引率

21.10%

发文量

632

审稿时长

7.3 months

期刊介绍： Annals of Nuclear Energy provides an international medium for the communication of original research, ideas and developments in all areas of the field of nuclear energy science and technology. Its scope embraces nuclear fuel reserves, fuel cycles and cost, materials, processing, system and component technology (fission only), design and optimization, direct conversion of nuclear energy sources, environmental control, reactor physics, heat transfer and fluid dynamics, structural analysis, fuel management, future developments, nuclear fuel and safety, nuclear aerosol, neutron physics, computer technology (both software and hardware), risk assessment, radioactive waste disposal and reactor thermal hydraulics. Papers submitted to Annals need to demonstrate a clear link to nuclear power generation/nuclear engineering. Papers which deal with pure nuclear physics, pure health physics, imaging, or attenuation and shielding properties of concretes and various geological materials are not within the scope of the journal. Also, papers that deal with policy or economics are not within the scope of the journal.