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Study of the Mechanical Properties of Highly Efficient Heat Exchange Tubes

机译：高效热交换管的力学性能研究

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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：高效的热交换管是换热器广泛应用的特殊管形状，以增强传热。在该研究中，实验测量和数值模拟在两种类型的高效热交换管中进行，即螺旋槽管和会聚散热管，以研究从光滑管轧制后的机械性能的变化。发现，与光滑的管不同，在轴向载荷下的两种管中存在所有轴向，圆周和径向应力，并且最大轴向应力远大于光滑管的轴向应力远大。与光滑的管相比，高效热交换管的屈服强度和极限强度增加，而轴向弹性刚度降低。虽然抗疲劳管的抗疲劳骨折的能力小于光滑管，但它们仍然符合疲劳负载下的热交换器的要求。高效热交换管的轴向应力集中因子和刚度等同因子作为工程应用的结构参数的函数来回归。

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