One of the most important principles in heat exchangers is to increase heat transfer and minimize pressure drop. In the present work, a two-tube spiral heat exchanger equipped with a conical turbulator is considered. In the first part of this analysis, the diameter of the inner spiral coil was investigated. In the second part of the study, the effect of the type of working fluid on heat transfer and the hydrodynamic factors of the fluid were investigated. In the first part of the study, the results showed that the highest value of thermal performance was at the lowest Reynolds number and the value of thermal performance at this Reynolds number (Reynolds = 250) was for diameters of 42 mm, 46 mm. and 50 mm was 35, 20 and 30 percent higher than the number 1. In the second part of the study, the results showed that the thermal performance values for Water/SWCNT_MWCNT, Water/Al2O3_TiO2 and pure water were 39 %, 37 % and 35 % higher than 1, respectively, which indicates the great effect of the conical turbulator and nanohybrid fluids in improving heat transfer. This study showed that the use of the innovative conical turbulator significantly improves heat transfer and increases the efficiency of the studied double-tube spiral heat exchanger. Therefore, the use of the conical turbulator has a significant effect on increasing the thermal performance of the intended heat exchanger and the use of this type of turbulator is recommended in the industry.

中文翻译：

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几何参数和流体参数对锥形湍流器双管螺旋式换热器热性能影响的数值研究


换热器中最重要的原则之一是增加传热并最大限度地减少压降。在本工作中，考虑了一种配备锥形湍流器的双管螺旋式换热器。在该分析的第一部分，研究了内部螺旋线圈的直径。在研究的第二部分，研究了工作流体类型对传热的影响以及流体的流体动力学因素。在研究的第一部分，结果表明，热性能的最高值位于最低的雷诺数，而该雷诺数 （Reynolds = 250） 的热性能值适用于 42 mm、46 mm 和 50 mm 的直径，比数字 1 高 35%、20% 和 30%。在研究的第二部分，结果表明，水/SWCNT_MWCNT、水/Al2O3_TiO2和纯水的热性能值分别比 1 高 39 %、37 % 和 35 %，这表明锥形湍流器和纳米混合流体在改善传热方面具有很大的作用。这项研究表明，使用创新的锥形湍流器显着改善了传热，并提高了所研究的双管螺旋换热器的效率。因此，使用锥形湍流器对提高预期热交换器的热性能有显着影响，业内建议使用这种类型的湍流器。