Analysis of enhanced heat transfer characteristics in a bionic fish scale tube for turbulent flow

IF 2.6 3区工程技术 Q1 NUCLEAR SCIENCE & TECHNOLOGY

Nuclear Engineering and Technology Pub Date : 2025-05-24 DOI:10.1016/j.net.2025.103715

Xiaoya Liu , Xinwen Zhao , Lingke Ran , Hongguang Xiao , Yongfa Zhang , Yinxing Zhang , Yiqiang Liu , Nan Zhang , Ming Ding

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引用次数: 0

Abstract

The miniaturization and compactness of heat exchangers are of great significance to marine power plant. Combining bionic technologies and passive technologies, a bionic fish scale tube (BFST) is proposed to enhance convective heat transfer coefficient of tube. The numerical simulation on flow and heat transfer characteristics of BFST is deliberated in turbulent flow region. Effects of various vertical heights, horizontal gaps, circumferential numbers and distance of adjacent fish scales have been investigated. Furthermore, the entropy generation and field synergy are also analyzed and correlations for Nusselt number and friction factor are obtained. These results suggest that local velocity increment, vortexes formed at the behind of fish scales and swirling of the flow are three main factors to improve the tube inner convective heat transfer coefficient. The Nusselt number is also significantly increased with the increment of vertical height, horizontal gap and circumferential numbers. Moreover, the maximum value of performance evaluation criteria at the ranges of studied can be up to 1.352 for BFST. S/S₀ of BFST are aggrandize with the Reynolds number increasing, which vary from 1.66 to 16.75. At last, the Nusselt number and friction factor correlations can predict the numerical data within R-square of 0.9910 and 0.9712 respectively.

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仿生鱼鳞管紊流强化传热特性分析

换热器的小型化和紧凑化对船舶动力装置具有重要意义。将仿生技术与被动技术相结合，提出了一种提高鱼鳞管对流换热系数的仿生鱼鳞管。研究了湍流区BFST的流动和换热特性的数值模拟。研究了不同垂直高度、水平间隙、邻近鱼鳞的周长和距离对鱼鳞的影响。此外，还分析了熵的产生和场协同作用，得到了努塞尔数与摩擦因数的相关关系。结果表明，局部速度的增加、鱼鳞尾部涡的形成和气流的旋流是提高管内对流换热系数的三个主要因素。努塞尔数也随着垂直高度、水平间隙和周向数的增加而显著增加。在研究范围内，BFST的性能评价指标最大值可达1.352。随着雷诺数的增加，BFST的S/S增大，在1.66 ~ 16.75之间。最后，Nusselt数和摩擦因子相关性可以分别在0.9910和0.9712的r平方范围内预测数值数据。

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来源期刊

Nuclear Engineering and Technology 工程技术-核科学技术

CiteScore

4.80

自引率

7.40%

发文量

431

审稿时长

3.5 months

期刊介绍： Nuclear Engineering and Technology (NET), an international journal of the Korean Nuclear Society (KNS), publishes peer-reviewed papers on original research, ideas and developments in all areas of the field of nuclear science and technology. NET bimonthly publishes original articles, reviews, and technical notes. The journal is listed in the Science Citation Index Expanded (SCIE) of Thomson Reuters. NET covers all fields for peaceful utilization of nuclear energy and radiation as follows: 1) Reactor Physics 2) Thermal Hydraulics 3) Nuclear Safety 4) Nuclear I&C 5) Nuclear Physics, Fusion, and Laser Technology 6) Nuclear Fuel Cycle and Radioactive Waste Management 7) Nuclear Fuel and Reactor Materials 8) Radiation Application 9) Radiation Protection 10) Nuclear Structural Analysis and Plant Management & Maintenance 11) Nuclear Policy, Economics, and Human Resource Development