The characteristics of heat transfer and fluid flow of an internally longitudinal finned tube were numerically studied. The results were validated with published experimental data, comparing the heat transfer coefficient and friction factor calculated in our numerical study with the corresponding values obtained from experimental data, with a highest deviation of . Exploring a novel hollow longitudinal fin design to enhance heat transfer and reduce pressure drop, while investigating key parameters like fin angle inscribed diameter , and fin thickness . Through comprehensive analysis, valuable insights are offered into optimizing thermal performance compared to traditional smooth tube configurations. The study reveals that a rise in leads to a rise in heat transfer coefficient and a reduction in friction factor. Notably, in the case of internally finned tubes at the are times higher, respectively, compared to smooth tubes under a constant mass flow rate ranging from . Furthermore, variations in impact the for internally finned tubes, with a decrease in resulting in increased . Specifically, at = 8, the exceed those of smooth tubes by times, respectively, under a constant mass flow rate across the same range. Additionally, the study investigates the effects of on internally finned tubes, showing that as the increases, the increase. In the case of , the increase to times higher, respectively, compared to smooth tubes under a constant mass flow rate from 10 kg/h to 60 kg/h.

中文翻译：

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内纵向翅片管的传热和流体流动性能：数值研究和实验验证

对内纵向翅片管的传热和流体流动特性进行了数值研究。结果通过已发表的实验数据进行了验证，将我们数值研究中计算的传热系数和摩擦系数与实验数据获得的相应值进行了比较，最大偏差为 。探索一种新颖的中空纵向翅片设计，以增强传热并降低压降，同时研究翅片角度内切直径和翅片厚度等关键参数。通过全面分析，与传统光滑管配置相比，可以为优化热性能提供宝贵的见解。研究表明，温度升高会导致传热系数升高和摩擦系数降低。值得注意的是，在恒定质量流量范围为 的情况下，与光滑管相比，内翅片管的 分别高出 3 倍。此外，变化对内部翅片管的影响，减少导致增加。具体来说，当= 8时，在相同范围内的恒定质量流量下，分别超过光滑管数倍。此外，该研究还调查了对内部翅片管的影响，结果表明，随着温度的增加，该影响也会增加。在 的情况下，与光滑管相比，在恒定质量流量从 10 kg/h 到 60 kg/h 的情况下，增幅分别高出几倍。