配备扭曲椭圆管的新型毫微米级散热器的数值研究

IF 3.8 3区 工程技术 Q3 ENERGY & FUELS Chemical Engineering and Processing - Process Intensification Pub Date : 2024-09-01 DOI:10.1016/j.cep.2024.109970
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引用次数: 0

摘要

一些小型化学反应器的热管理对于获得高质量的最终产品至关重要,而散热器在此类系统的散热方面可以发挥显著作用。为此,本研究评估了装有扭曲椭圆管(TET)的散热器中的共轭传热问题。研究了雷诺数(Re = 250、350、500、700 和 950)和扭曲比(TR = 2.5、5 和 10)等重要参数对新型散热器的水热和热力学性能的影响。漩涡流是流体颗粒从热表面向冷表面迁移的主要原因,反之亦然。研究结果表明,TET 可使管壁温度更加均匀,避免产生热点。与普通椭圆管相比,散热片内 TET 的存在提高了传热率,并将压力降分别扩大了 1.08-2.03 倍和 1.02-1.92 倍。此外,TET 还降低了散热器内部的熵产生率,在 TR = 2.5 和 Re = 250 时检测到的第二定律效率最佳值约为 35%。
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Numerical investigation on a novel milli-sized heat sink equipped by twisted elliptical tubes

Thermal management in some small chemical reactors is essential to achieve a final high-quality product and heat sinks can play a remarkable role in dissipating heat from such systems. In this regard, this study attends to evaluate the conjugate heat transfer problem in a heat sink equipped by twisted elliptical tubes (TETs). The effects of significant parameters such as Reynolds number (Re = 250, 350, 500, 700 and 950) and twist ratio (TR = 2.5, 5 and 10) on hydrothermal and thermodynamics performance of the novel heat sink are investigated. The swirling flow is the main reason of fluid particles migration from hot surface to cold one and vice versa, leading a better heat transfer occurs at the expense of not significant pressure loss augmentation. The results revealed that the TETs are responsible of more wall temperature uniformity and avoids generating hot spots. Compared with plain elliptical tubes, the presence of TETs inside heat sink improves the heat transfer rate and enlarges the pressure drop by 1.08–2.03 times and by 1.02–1.92 times, respectively. In addition, the TETs decrease the entropy generation rate inside heat sink and the best value of second law efficiency is about 35 %, detected at TR = 2.5 and Re = 250.

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来源期刊
CiteScore
7.80
自引率
9.30%
发文量
408
审稿时长
49 days
期刊介绍: Chemical Engineering and Processing: Process Intensification is intended for practicing researchers in industry and academia, working in the field of Process Engineering and related to the subject of Process Intensification.Articles published in the Journal demonstrate how novel discoveries, developments and theories in the field of Process Engineering and in particular Process Intensification may be used for analysis and design of innovative equipment and processing methods with substantially improved sustainability, efficiency and environmental performance.
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