Abstract In order to design a new vortex generator (VG) and effectively induce and properly control the vibrations of elastic coil pipes (ECPs) in heat exchanger (HE), the effects of the fluid flow parameters, vortex element size and external flow field on vortex flows in a fluid domain with variable cross-section were analyzed. The vibration and heat transfer characteristics of the ECPs were studied based on the new VG. The numerical results show that the fluid flow parameters, vortex element size and external flow field have influence on the frequency and intensity of vortex flow. The VG designed in this paper can generate vortex flows with basically the same frequency and intensity at each branch outlet. Under the action of the new VG, the vibration amplitudes of the ECPs are significantly enhanced and the vibration uniformity is improved. Meanwhile, the new VG can increase the heat transfer coefficients of the ECPs and improve the consistency of the heat transfer performances of the ECPs.

中文翻译：

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变截面流体域涡流分析及新型涡流发生器设计

摘要 为了设计一种新型涡流发生器 (VG) 并有效诱导和适当控制换热器 (HE) 中弹性盘管 (ECP) 的振动，流体流动参数、涡元尺寸和外部流场对换热器 (HE) 中的振动的影响分析了具有可变截面的流体域中的涡流。基于新的 VG 研究了 ECP 的振动和传热特性。数值结果表明，流体流动参数、涡元尺寸和外部流场对涡流的频率和强度有影响。本文设计的VG可以在每个分支出口产生频率和强度基本相同的涡流。在新型VG的作用下，ECPs的振幅显着增强，振动均匀性得到改善。