Thermo-fluid dynamic design optimization of a concentric tube heat exchanger

IF 0.7 Q4 MECHANICS

Journal of Fluid Science and Technology Pub Date : 2019-01-01 DOI:10.1299/jfst.2019jfst0011

T. Hirano, Mitsuo Yoshimura, K. Shimoyama, A. Komiya

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引用次数: 2

Abstract

This study proposes a shape optimization approach for the cross-sectional shape of the inner pipe of a counter-flow concentric tube heat exchanger. The cross-sectional shape of the inner pipe is expressed by an algebraic expression with a small number of parameters, and their heat transfer performance is evaluated by a commercial Computational Fluid Dynamics (CFD) solver. The optimization is conducted by the Non-Dominated Sorting Genetic Algorithm II (NSGA-II) assisted by the Kriging surrogate model, and the NSGA-II finds the optimal cross-sectional shape with many protrusions around the perimeter of the inner channel to improve the heat transfer performance. In this study, heat transfer performance is evaluated from the temperature drop at the outlet of the high-temperature fluid. The present optimization finds the optimal channel with many protrusions, which achieves lower outlet temperature than a circular channel even with the same heat transfer surface area. This result indicates that the number of protrusions plays important roles which contribute not only to increase heat transfer area but also to improve heat transfer performance.

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同心管式换热器热流体动力学设计优化

本文提出了一种逆流同心管换热器内管截面形状的形状优化方法。采用带有少量参数的代数表达式来表示内管的截面形状，并利用商用计算流体力学(CFD)求解器对其传热性能进行了评估。通过非支配排序遗传算法II (non - dominate Sorting Genetic Algorithm II, NSGA-II)辅助Kriging代理模型进行优化，NSGA-II找到了内通道周长周围有许多凸起的最优截面形状，以提高传热性能。在本研究中，传热性能是从高温流体出口的温度下降来评估的。优化结果表明，在相同换热面积的情况下，具有多个凸点的最优通道的出口温度要低于圆形通道。结果表明，凸出物的数量对增大换热面积和提高换热性能具有重要作用。

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

Journal of Fluid Science and Technology MECHANICS-

CiteScore

1.00

自引率

12.50%

发文量

期刊介绍： Journal of Fluid Science and Technology (JFST) is an international journal published by the Fluids Engineering Division in the Japan Society of Mechanical Engineers (JSME). JSME had been publishing Bulletin of the JSME (1958-1986) and JSME International Journal (1987-2006) by the continuous volume numbers. Considering the recent circumstances of the academic journals in the field of mechanical engineering, JSME reorganized the journal editorial system. Namely, JSME discontinued former International Journals and projected new publications from the divisions belonging to JSME. The Fluids Engineering Division acted quickly among all divisions and launched the premiere issue of JFST in January 2006. JFST aims at contributing to the development of fluid engineering by publishing superior papers of the scientific and technological studies in this field. The editorial committee will make all efforts for promoting strictly fair and speedy review for submitted articles. All JFST papers will be available for free at the website of J-STAGE (http://www.i-product.biz/jsme/eng/), which is hosted by Japan Science and Technology Agency (JST). Thus papers can be accessed worldwide by lead scientists and engineers. In addition, authors can express their results variedly by high-quality color drawings and pictures. JFST invites the submission of original papers on wide variety of fields related to fluid mechanics and fluid engineering. The topics to be treated should be corresponding to the following keywords of the Fluids Engineering Division of the JSME. Basic keywords include: turbulent flow; multiphase flow; non-Newtonian fluids; functional fluids; quantum and molecular dynamics; wave; acoustics; vibration; free surface flows; cavitation; fluid machinery; computational fluid dynamics (CFD); experimental fluid dynamics (EFD); Bio-fluid.