Investigating the effects of near-wall active vortex generators on heat transfer inside a channel

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.2024.109479

引用次数: 0

Abstract

Most of previous researches on enhancing the heat transfer rate in pipes and channels have focused on passive methods. This article introduces near wall active vortex generators (NWAVG) as a strong way to enhance the heat transfer rate from rectangular channels and simultaneously keep friction losses as low as possible. This article considers three different motion patterns for NWAVG at a constant Reynolds number of 1000. Also, the impact of different numbers of vortex generators and different parameters of each motion pattern on the Darcy friction factor, the Nusselt number and the overall hydrothermal efficiency are examined. The results show that the effect of vortex generators on the heat transfer rate increases significantly when they approach the channel wall. Moreover, the results show that the NWAVG can achieve an 185 % increase in the Nusselt number with an overall hydrothermal efficiency of 1.26.

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研究近壁主动涡流发生器对通道内传热的影响

以往关于提高管道和通道传热率的研究大多集中在被动方法上。本文介绍了近壁主动涡流发生器（NWAVG），它是提高矩形水道传热率并同时尽可能降低摩擦损失的有力方法。本文考虑了雷诺数恒定为 1000 时 NWAVG 的三种不同运动模式。此外，还研究了不同数量的涡流发生器和每种运动模式的不同参数对达西摩擦因数、努塞尔特数和整体水热效率的影响。结果表明，当涡流发生器接近通道壁时，它们对传热速率的影响会显著增加。此外，结果表明，NWAVG 可使努塞尔特数增加 185%，整体水热效率达到 1.26。

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.