The heat transfer and resistance performances of heat exchangers with symmetric, asymmetric, and helical corrugated tubes are investigated experimentally. Numerical simulations are conducted to examine the mechanism of thermodynamics and fluid flow. The total heat transfer efficiency of heat exchangers using these tubes is analyzed, and optimal velocity matching values are presented. The results demonstrate that the heat transfer and resistance performances of each corrugated tube on the shell side are better than those on the tube side. When compared with the symmetric corrugated tube, the large fillet radius of the asymmetric corrugated tube reduces the heat transfer and resistance performances, and the helical structure of the helical corrugated tube leads to a significant decrease in the resistance performance with a slight decrease in the heat transfer performance. The comprehensive heat transfer performance of the helical corrugated tube is better than those of other corrugated tubes by 1.5 times on the tube side and 1.67 times on the shell side. Additionally, based on the mechanism analysis, the large fillet radius of the asymmetric corrugated tube reduces the size and strength of the vortex at corrugation, while the helical flow in the helical corrugated tube significantly reduces the size of the vortex in the axial direction and extends the vortex in the radial direction. Furthermore, the maximum heat transfer efficiency and optimal velocity matching values are obtained by analyzing the total heat transfer capacity and fluid transport power of heat exchangers using the experimental tubes.

中文翻译：

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使用波纹管研究换热器中的传热增强和速度匹配

实验研究了对称，不对称和螺旋波纹管的换热器的传热和阻力性能。进行数值模拟以检查热力学和流体流动的机理。分析了使用这些管的热交换器的总传热效率，并给出了最佳速度匹配值。结果表明，每个波纹管在壳侧的传热和阻力性能均优​​于管侧。与对称波纹管相比，不对称波纹管的大圆角半径会降低传热和阻力性能，螺旋波纹管的螺旋结构导致电阻性能显着降低，而传热性能略有下降。螺旋波纹管的综合传热性能比其他波纹管高1.5倍，壳侧1.67倍。另外，基于机理分析，不对称波纹管的大圆角半径减小了波纹形成时涡旋的尺寸和强度，而螺旋波纹管中的螺旋流动显着减小了轴向涡旋的尺寸并延伸。径向上的涡旋。此外，