Numerical study of structural parameters of perforated baffle on heat transfer enhancement in coiled elastic copper tube heat exchanger

IF 6.1 2区工程技术 Q2 ENERGY & FUELS

Applied Thermal Engineering Pub Date : 2024-11-19 DOI:10.1016/j.applthermaleng.2024.124993

Yaru Sun , Dequan Li , Jiadong Ji , Zisen Hua

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引用次数: 0

Abstract

To bridge the research gaps regarding the heat transfer enhancement characteristics of coiled elastic copper tube (CECT) by spiral baffle, the CECT heat exchangers equipped with perforated and those with non-perforated spiral baffles (CECT-WP, CECT-NP) are presented. A two-way fluid–structure interaction method is utilized to numerically study the effects of the baffle helix turn number and perforation diameter on fluid flow and heat transfer at different inflow Reynolds numbers. The results show that there exists an optimal helix turn number and perforation diameter for the best heat transfer performance. Compared with CECT-NP, when the helix turn number ranges from 5 to 9, the JF-factor of CECT-WP is improved by up to 4.28 % at helix turn number of 8; when the baffle perforation diameter ranges from 12 to 24 mm, the JF-factor of CECT-WP is improved by up to 4.02 % at perforation diameter of 21 mm. Moreover, the structure of the CECT-WP is further optimized by reducing the number of spiral baffles from four to two, and ultimately to one. The vibration-enhanced heat transfer and overall heat transfer performances are found to be the best with one spiral baffle, showing improvements of up to 1.35 % and 4.24 %, respectively. Installing perforated spiral baffles in the CECT heat exchanger is an effective technique for improving overall heat transfer performance and has enlightening significance for engineering applications.

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穿孔挡板结构参数对盘绕式弹性铜管热交换器传热强化作用的数值研究

为了弥补有关螺旋挡板增强盘绕弹性铜管（CECT）传热特性的研究空白，本文介绍了配备有孔螺旋挡板和无孔螺旋挡板的 CECT 热交换器（CECT-WP、CECT-NP）。利用双向流体-结构相互作用方法，对不同流入雷诺数下挡板螺旋转数和穿孔直径对流体流动和传热的影响进行了数值研究。结果表明，存在一个最佳的螺旋转数和穿孔直径，以获得最佳的传热性能。与 CECT-NP 相比，当螺旋转数在 5 到 9 之间时，CECT-WP 的 JF 因子在螺旋转数为 8 时提高了 4.28%；当挡板穿孔直径在 12 到 24 毫米之间时，CECT-WP 的 JF 因子在穿孔直径为 21 毫米时提高了 4.02%。此外，通过将螺旋挡板的数量从四个减少到两个，并最终减少到一个，CECT-WP 的结构得到了进一步优化。结果发现，一个螺旋挡板的振动增强传热性能和整体传热性能最好，分别提高了 1.35% 和 4.24%。在 CECT 热交换器中安装穿孔螺旋挡板是提高整体传热性能的有效技术，对工程应用具有启示意义。

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

Applied Thermal Engineering 工程技术-工程：机械

CiteScore

11.30

自引率

15.60%

发文量

1474

审稿时长

57 days

期刊介绍： Applied Thermal Engineering disseminates novel research related to the design, development and demonstration of components, devices, equipment, technologies and systems involving thermal processes for the production, storage, utilization and conservation of energy, with a focus on engineering application. The journal publishes high-quality and high-impact Original Research Articles, Review Articles, Short Communications and Letters to the Editor on cutting-edge innovations in research, and recent advances or issues of interest to the thermal engineering community.