Numerical investigation of the effects of geometric and fluid parameters on the thermal performance of a double -tube spiral heat exchanger with a conical turbulator

IF 6.4 2区工程技术 Q1 THERMODYNAMICS Case Studies in Thermal Engineering Pub Date : 2025-01-01 DOI:10.1016/j.csite.2024.105613

Seyed Hossein Hashemi Karouei , Walaa Nasser Abbas , Mohammed Ali , Dhuha Radhi Nayyef , Karrar K. Abdul Hussein , Karrar A. Hammoodi , Seyed Saeed Hosseini Azizi

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Abstract

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 / A l_{2} O_{3}_T i O_{2}

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.

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几何参数和流体参数对带有锥形涡轮的双管螺旋热交换器热性能影响的数值研究

换热器的一个最重要的原则是增加传热和减小压降。本文研究了一种带有锥形湍流器的双管螺旋换热器。在分析的第一部分，研究了内螺旋线圈的直径。在研究的第二部分，研究了工质类型对传热的影响以及工质的流体动力因素。在研究的第一部分中，研究结果表明，在最低雷诺数下的热性能值最高，并且在该雷诺数（雷诺数为250）下，直径为42 mm、46 mm和50 mm时的热性能值分别比1高35%、20%和30%。在第二部分的研究中，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%，表明锥形湍流器和纳米混合流体对改善传热有很大的作用。研究表明，采用创新的锥形紊流器后，所研究的双管螺旋换热器的传热效果显著改善，效率提高。因此，使用锥形紊流器对提高预期换热器的热性能有显著的效果，行业中推荐使用这种类型的紊流器。

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来源期刊

Case Studies in Thermal Engineering Chemical Engineering-Fluid Flow and Transfer Processes

CiteScore

8.60

自引率

11.80%

发文量

812

审稿时长

76 days

期刊介绍： Case Studies in Thermal Engineering provides a forum for the rapid publication of short, structured Case Studies in Thermal Engineering and related Short Communications. It provides an essential compendium of case studies for researchers and practitioners in the field of thermal engineering and others who are interested in aspects of thermal engineering cases that could affect other engineering processes. The journal not only publishes new and novel case studies, but also provides a forum for the publication of high quality descriptions of classic thermal engineering problems. The scope of the journal includes case studies of thermal engineering problems in components, devices and systems using existing experimental and numerical techniques in the areas of mechanical, aerospace, chemical, medical, thermal management for electronics, heat exchangers, regeneration, solar thermal energy, thermal storage, building energy conservation, and power generation. Case studies of thermal problems in other areas will also be considered.