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Study of the Mechanical Properties of Highly Efficient Heat Exchange Tubes

机译：高效换热管力学性能研究

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Highly efficient heat exchange tubes are special tube shapes that are widely used in heat exchangers to enhance heat transfer. In this study, experimental measurements and numerical simulations were carried out on two types of highly efficient heat exchange tubes, namely, spirally grooved tubes and converging–diverging tubes, to investigate changes in their mechanical properties after rolling from smooth tubes. It was found that, unlike the smooth tubes, all axial, circumferential, and radial stresses exist at the two types of tubes under axial loading, and the maximum axial stress is much larger than that at the smooth tubes. Compared to the smooth tubes, the yield strength and ultimate strength of the highly efficient heat exchange tubes increase while the axial elastic stiffness decreases. Although the capability of resisting fatigue fracture of the highly efficient heat exchange tubes is less than that of smooth tubes, they still meet the requirements of the heat exchanger under fatigue loading. Axial stress concentration factors and stiffness equivalent factors for the highly efficient heat exchange tubes are regressed as a function of the structural parameters for engineering applications.
机译：高效的热交换管是特殊的管形，已广泛用于热交换器中以增强热传递。在这项研究中，对两种高效换热管（螺旋槽管和会聚发散管）进行了实验测量和数值模拟，以研究从光滑管轧制后它们的机械性能变化。已经发现，与光滑管不同，在轴向载荷下，两种类型的管都存在轴向，圆周和径向应力，并且最大轴向应力比光滑管大。与光滑管相比，高效换热管的屈服强度和极限强度增加，而轴向弹性刚度减小。尽管高效换热管的抗疲劳断裂能力不及光滑管，但仍能满足热交换器在疲劳载荷下的要求。针对工程应用，将高效换热管的轴向应力集中系数和刚度等效系数作为结构参数的函数进行回归。

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