Numerical evaluation of the impact of using spiral innovative turbulator on improving the thermal performance of a helical double-pipe heat exchanger

Q1 Chemical Engineering International Journal of Thermofluids Pub Date : 2024-08-26 DOI:10.1016/j.ijft.2024.100830
Seyed Soheil Mousavi Ajarostaghi , Ali Basem , Khalid Waleed Al-Mansoori , Abbas J. Sultan , Mortatha Al-Yasiri , Seyed Hossein Hashemi Karouei , Hossein Ahangaran
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Abstract

Due to the necessity of performing thermal operations, heat exchangers are widely employed in many different areas. The heat transfer and fluid flow within a spiral double-pipe heat exchanger fitted with a novel turbulator were numerically assessed in this work. The presented novel turbulator is a curved tube with holes incorporated into its thickness and spiral ribs on its inner wall. The turbulator wall's curved rib design produces secondary flows at the turbulator output when fluid flows through the tube and the perforations. A commercial CFD tool, based on the finite volume technique, was used to conduct the numerical simulations. The fluid flow regime is turbulence (Re = 8,000 – 14,000). Two sections make up this work. The first portion looked at how the hydrothermal behavior of the fluid flow inside the proposed turbulator was affected by the angle at which the curved ribs rotated. For this angle, three values were considered: θ = 30, 90, and 150°, and the outcomes were contrasted with those of a plain spiral double-tube heat exchanger (turbulator not included). Then, the number of embedded holes in the turbulator's thickness changes in the second part, and three values of N = 12, 16, and 20 were considered. According to the first part's findings, the model exhibiting θ = 90° had a greater thermal performance factor at Re = 10,000. This model has a more noteworthy thermal performance factor than the models with θ = 150 and θ = 30° by approximately 15.62 % and 22.65 %, respectively (at Re = 10,000). Furthermore, the second section's numerical findings showed that the model with N = 20 had more extraordinary thermal performance at Re = 10,000. Model N = 20 has a thermal performance factor of about 16.93 % and 17.55 % greater than models N = 16 and N = 12. Within the proposed heat exchanger, the recommended turbulator produced a sizable rotating flow, and including embedded holes significantly reduced the pressure drop this kind of turbulator causes.

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使用螺旋创新涡轮器对提高螺旋双管热交换器热性能影响的数值评估
由于热操作的必要性,热交换器被广泛应用于许多不同领域。在这项工作中,对装有新型涡轮器的螺旋双管热交换器内的传热和流体流动进行了数值评估。所介绍的新型涡轮器是一根弯曲的管子,其厚度上有孔,内壁上有螺旋肋条。当流体流经管道和穿孔时,涡轮壁上的弧形肋条设计会在涡轮输出端产生二次流。数值模拟使用了基于有限体积技术的商用 CFD 工具。流体流动状态为湍流(Re = 8,000 - 14,000)。这项工作分为两个部分。第一部分研究了拟议湍流器内部流体流动的水热行为如何受到弯曲肋条旋转角度的影响。对于这个角度,考虑了三个值:θ = 30、90 和 150°,并将结果与普通螺旋双管热交换器(不包括湍流器)的结果进行了对比。然后,在第二部分中,涡轮器厚度中的嵌入孔数量发生了变化,并考虑了 N = 12、16 和 20 三个值。根据第一部分的研究结果,在 Re = 10,000 时,θ = 90° 的模型具有更大的热性能系数。与 θ = 150 和 θ = 30° 的模型相比,该模型的热性能系数更为显著,分别提高了约 15.62 % 和 22.65 %(Re = 10,000 时)。此外,第二部分的数值研究结果表明,在 Re = 10,000 时,N = 20 的模型具有更出色的热性能。N = 20 型号的热性能系数比 N = 16 和 N = 12 型号分别高出约 16.93 % 和 17.55 %。在建议的热交换器中,推荐使用的涡轮产生了大量的旋转流,而嵌入孔则大大降低了这种涡轮造成的压降。
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来源期刊
International Journal of Thermofluids
International Journal of Thermofluids Engineering-Mechanical Engineering
CiteScore
10.10
自引率
0.00%
发文量
111
审稿时长
66 days
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