Heat transfer enhancement of a copper tube with constant wall temperature using a novel horizontal perforated teardrop-shaped turbulators (PTST)

IF 4.9 2区工程技术 Q1 ENGINEERING, MECHANICAL

International Journal of Thermal Sciences Pub Date : 2023-10-01 DOI:10.1016/j.ijthermalsci.2023.108418

Hongliang Wang , Azher M. Abed , A. Al-Zubaidi , Ahmed Deifalla , Ahmed M. Galal , Yanan Zhou , S.P. Ghoushchi

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引用次数: 2

Abstract

Considering that turbulators generally have a high pressure drop level and as a result low thermal performance, in this research a numerical study conducted for a new form of aerodynamically designed turbulators that are concentrically perforated to have less pressure drop. In this study, the effects of a novel perforated teardrop-shaped turbulator (PTST) on the hydro-thermal parameters were numerically examined. Results were compared with a plain tube and a tube equipped with a simple teardrop-shaped turbulator (STST). PTST with the horizontal perforation geometry including a square, hexagon, octagon, and circle holes was installed inside a copper tube with constant wall temperature. The effect of the horizontal perforation cross-section area on the heat transfer and pressure drop was also evaluated. Tests were conducted under turbulence flow rates in the range of 0.044–0.099 kg/s. To select the optimal case, the thermal enhancement factor (TEF) was calculated. The results clarified that the hole area and hole geometry have a significant effect on TEF and hydro-thermal parameters. The highest heat transfers and pressure drop took place in the presence of the STST, while the highest TEF was equivalent to 1.39 and occurred in the presence of a PTST with a 5 mm diameter circular hole. The heat transfers in the presents of STST and PTST increased by 310.1% and 298% compared to the plain tube. Finally, a correlation expressing the relationship of TEF and perforation area was also presented based on curve fitting.

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利用新型水平多孔泪滴型紊流器(PTST)增强铜管恒壁温传热

考虑到紊流通常具有较高的压降水平，从而导致较低的热性能，本研究对一种新型的同心穿孔气动设计紊流进行了数值研究，以减小压降。本文研究了一种新型的多孔泪滴形湍流器(PTST)对水热参数的影响。结果与普通管和装有简易泪滴形湍流器(STST)的管进行比较。PTST的水平射孔几何形状包括正方形、六边形、八边形和圆形孔，安装在铜管内，壁温恒定。分析了水平射孔截面面积对传热和压降的影响。试验在0.044-0.099 kg/s的湍流流速范围内进行。为了选择最佳情况，计算了热增强系数(TEF)。结果表明，井眼面积和井眼几何形状对TEF和热液参数有显著影响。在有STST存在时，传热和压降最高，而在有直径5mm圆孔的PTST存在时，TEF最高，相当于1.39。与普通管相比，STST和PTST的换热量分别增加了310.1%和298%。最后，通过曲线拟合得到了TEF与射孔面积的相关关系。

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.