Entropy generation in conjugate mixed convection of a rough cylindrical surface confined within a square chamber under internal heat generation

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

Annals of Nuclear Energy Pub Date : 2025-09-23 DOI:10.1016/j.anucene.2025.111898

Mohammad Shakhawat Khan, Md. Maruf Tahmid, Saad Al Razee, Tawsif Iqbal, Sumon Saha

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Abstract

This study investigates conjugate mixed convection in a lid-driven cavity containing a rough-walled cylinder with internal heat generation. Three roughness geometries (circular, triangular, square) and different cylinder placements are considered, with the working fluid modeled as a water-ethylene glycol mixture undergoing laminar flow (10³ ≤ Gr ≤ 10⁵, 31.62 ≤ Re ≤ 316.23, 0.1 ≤ Ri ≤ 10). The dynamics of fluid motion and thermal distribution within the solid cylinder and the cavity are dictated by two-dimensional Navier-Stokes and energy equations, which are numerically resolved through the finite element approach. The current study reveals that a circular-shaped rough cylinder positioned at the center of the cavity yields better optimization through ECOP and effectiveness when there is no internal heat generation. With the internal heat generation, thermal transport drops around 10 % at a high Re, whereas the ECOP drops around 70 % for the entire range of parameters. Hence, the other parameter should be optimized to mitigate this adverse situation when the system involves heat generation.

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内热作用下方形腔室内粗糙圆柱面共轭混合对流的熵生成

本研究探讨了含内热产生的粗壁圆柱体的盖驱动腔内的共轭混合对流。考虑了三种粗糙度几何形状（圆形、三角形、方形）和不同的圆柱体放置位置，将工作流体建模为层流的水-乙二醇混合物（103≤Gr≤105,31.62≤Re≤316.23,0.1≤Ri≤10）。固体圆柱体和腔内流体运动和热分布的动力学由二维Navier-Stokes方程和能量方程决定，并通过有限元方法进行数值求解。目前的研究表明，在腔体中心放置圆形粗圆柱，在没有内部产生热量的情况下，通过ECOP和效率可以获得更好的优化效果。随着内部热的产生，在高Re下，热输运下降约10%，而在整个参数范围内，ECOP下降约70%。因此，当系统涉及产生热量时，其他参数应进行优化以减轻这种不利情况。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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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.