Spiral heat exchangers in the heat transfer field have attracted researchers' attention due to their better heat transfer characteristics. This review discusses the increase in efficiency of this type of converter. to better understand the efficiency of the intended spiral exchanger, thermal efficiency (performance evaluation criteria) was chosen as the performance index in the present work, and the simulations were carried out in a calm regime () and for two positive and negative flows and using three types of fluids. This study aims to conduct a numerical analysis of the impact of nanohybrid fluid type and fluid volume concentration on heat transfer and pressure drop in a spiral double-double-tube exchanger incorporating a conical turbulator. Computational fluid dynamics was employed in the study. The problem is tackled using ANSYS FLUENT 18 to conduct CFD simulations utilizing the finite volume method. The numerical findings indicate that employing countercurrent flow and a nanohybrid fluid of Water/MoS–FeO significantly impacts overall performance, potentially boosting the spiral heat exchanger's efficiency by 8 %. The findings indicated that raising the volume concentration of the nanohybrid fluid Water/MoS–FeO from 0.3 % to 0.5 % and 0.7 % leads to a notable enhancement in the thermal efficiency of this converter type. The converter achieves its peak efficiency at Reynolds number 200 when using the nanohybrid fluid Water/MoS–FeO, resulting in a 4 % and 17 % increase in thermal performance compared to the other two concentrations.

中文翻译：

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流体纳米混合类型和流体体积浓度对配备创新锥形湍流器的螺旋双管换热器传热和压降影响的数值研究


传热领域中的螺旋换热器因其较好的传热特性而引起了研究人员的关注。本综述讨论了此类转换器效率的提高。为了更好地了解预期螺旋换热器的效率，选择热效率（性能评估标准）作为本工作中的性能指标，并在平静状态（）和两种正向和反向流动下进行模拟，并使用三种类型的流体。本研究旨在对纳米混合流体类型和流体体积浓度对包含锥形湍流器的螺旋双双管交换器中的传热和压降的影响进行数值分析。该研究采用了计算流体动力学。使用 ANSYS FLUENT 18 利用有限体积法进行 CFD 模拟来解决该问题。数值结果表明，采用逆流和水/MoS-FeO 纳米混合流体可显着影响整体性能，有可能将螺旋换热器的效率提高 8%。研究结果表明，将纳米混合流体水/MoS2-Fe2O3 的体积浓度从 0.3% 提高到 0.5% 和 0.7% 可以显着提高该转换器类型的热效率。当使用纳米混合流体水/MoS2-Fe2O3时，转换器在雷诺数 200 时达到峰值效率，与其他两种浓度相比，热性能提高了 4% 和 17%。