Thermo-hydraulic characteristics of offset strip fin heat exchanger with vortex generators

IF 4.9 2区工程技术 Q1 ENGINEERING, MECHANICAL

International Journal of Thermal Sciences Pub Date : 2024-10-16 DOI:10.1016/j.ijthermalsci.2024.109459

Taipeng Guo , Qifan Wang , Yu Zhang , Zhentao Liu

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Abstract

The finned structure of the Offset Strip Fin (OSF) and the vortex generators (VG) both offer significant potential for enhanced heat transfer. This paper investigates the thermal-hydraulic characteristics of the OSF heat exchanger (HEX) with VG installed on the rib base surface. The study examines the geometrical configuration of the VG, including their shape, spatial positioning, longitudinal extent, and angle of attack, to determine their respective impacts on system performance. VG shapes perform differently across various Reynolds numbers (Re), defining the transition point as the Thermal Exchange Efficacy Transition Re (Re_TEET). Findings suggest that increasing the distance of VG from the fin's leading edge, along with extending their length and increasing their angle of attack, collectively improves heat transfer efficiency and reduces the Re_TEET. However, achieving the Re_TEET becomes unfeasible when the angle of attack surpasses a certain threshold. At lower Reynolds numbers, the optimum performance occurs at a 45° angle of attack. As the Reynolds number increases, the optimum performance decreases with an increased angle of attack.

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带涡流发生器的偏置带翅片热交换器的热液压特性

偏置带翅片（OSF）的翅片结构和涡流发生器（VG）都为增强传热提供了巨大的潜力。本文研究了在肋片底面安装 VG 的 OSF 热交换器 (HEX) 的热液压特性。研究考察了 VG 的几何配置，包括其形状、空间定位、纵向范围和攻角，以确定它们各自对系统性能的影响。在不同的雷诺数 (Re) 下，VG 的形状表现不同，因此将过渡点定义为热交换效率过渡 Re (ReTEET)。研究结果表明，增加 VG 与鳍片前缘的距离、延长 VG 的长度和增大 VG 的攻角，可共同提高热传导效率并降低 ReTEET。然而，当攻角超过一定临界值时，达到 ReTEET 就变得不可行了。在雷诺数较低时，最佳性能出现在 45° 攻角处。随着雷诺数的增加，最佳性能会随着攻角的增大而降低。

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

International Journal of Thermal Sciences 工程技术-工程：机械

CiteScore

8.10

自引率

11.10%

发文量

531

审稿时长

55 days

期刊介绍： The International Journal of Thermal Sciences is a journal devoted to the publication of fundamental studies on the physics of transfer processes in general, with an emphasis on thermal aspects and also applied research on various processes, energy systems and the environment. Articles are published in English and French, and are subject to peer review. The fundamental subjects considered within the scope of the journal are: * Heat and relevant mass transfer at all scales (nano, micro and macro) and in all types of material (heterogeneous, composites, biological,...) and fluid flow * Forced, natural or mixed convection in reactive or non-reactive media * Single or multi–phase fluid flow with or without phase change * Near–and far–field radiative heat transfer * Combined modes of heat transfer in complex systems (for example, plasmas, biological, geological,...) * Multiscale modelling The applied research topics include: * Heat exchangers, heat pipes, cooling processes * Transport phenomena taking place in industrial processes (chemical, food and agricultural, metallurgical, space and aeronautical, automobile industries) * Nano–and micro–technology for energy, space, biosystems and devices * Heat transport analysis in advanced systems * Impact of energy–related processes on environment, and emerging energy systems The study of thermophysical properties of materials and fluids, thermal measurement techniques, inverse methods, and the developments of experimental methods are within the scope of the International Journal of Thermal Sciences which also covers the modelling, and numerical methods applied to thermal transfer.