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Fluid elastic instability and vortex induced vibration parameters in finned tube arrays with P/D ratio 1.79

机译:P/D比为1.79的翅片管阵列流体弹性不稳定性和涡旋引起的振动参数

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Purpose - This paper aims to analyze the effect of fin geometry on mechanisms of flow induced vibration. Finned tube arrays are used in a heat exchanger to increase its efficiency. Therefore, it is necessary to investigate the effect of geometric parameters of the fin fluid elastic instability and vortex shedding. In this paper, the effect of fin height, fin density and tube pitch ratio for parallel triangular tube array on fluid elastic instability and vortex shedding is analyzed. Design/methodology/approach - Experimental analysis was carried out on a parallel triangular finned tube array with a pitch ratio of 1.79 subjected to water crossflow. The experimentation aims to study fluid elastic instability and vortex-induced vibration mechanism responsible for flow induced vibration for finned tube array. A fully flexible finned tube array of the copper tube was used with its base diameter of 19.05 mm and thickness of 2 mm. Over the tube surface, crimped fins of height 6 mm and the same material are welded spirally with fin density 8.47 mm and 2.82 mm. Experimental analysis was carried out on a test setup developed for the same. The results obtained for the finned tube array were compared with those for the plain tube array with the same base tube diameter. Findings - For parallel triangular tube array of copper material, test results show that critical velocity increases with an increase in fin pitch density for low pitch tube array. Before the occurrence of instability, the rate of growth in tube vibrations is high for plain tubes compared to that with fin tubes. The results based on Owen's hypothesis show vortex shedding before the occurrence of fluid elastic instability. The effect of fin geometry on vortex-induced forces is analyzed. For the tube array pattern understudy, the values of Conner's constant K for coarse fin-tube and fine fin tube array are obtained, respectively, 6.14 and 7.25. Originality/value - This paper fulfills the need for research on the effect of fin geometry on fluid elastic instability and Vortex shedding on a tube array subjected to water cross flow when the pitch ratio is less than two, i.e. with a low pitch ratio.
机译:目的 - 本文旨在分析翅片几何形状对流动诱导振动机理的影响。翅片管阵列用于热交换器以提高其效率。因此,有必要研究鳍片流体弹性不稳定性和涡流脱落的几何参数的影响。本文分析了平行三角管阵列的鳍片高度、鳍片密度和管节距比对流体弹性失稳和涡流脱落的影响。设计/方法/途径 - 在水错流作用下,在螺距比为1.79的平行三角形翅片管阵列上进行了实验分析。该实验旨在研究翅片管阵列的流体弹性不稳定性和涡旋引起的振动机理。使用铜管的全柔性翅片管阵列,其底座直径为19.05 mm,厚度为2 mm。在管面上,高度为 6 mm 的卷曲翅片和相同材料以螺旋方式焊接,翅片密度为 8.47 mm 和 2.82 mm。在为此开发的测试装置上进行了实验分析。将翅片管阵列的结果与相同基管直径的普通管阵列的结果进行了比较。结果 - 对于铜材料的平行三角形管阵列,试验结果表明,低间距管阵列的临界速度随着翅片间距密度的增加而增加。在不稳定发生之前,与翅片管相比,普通管的管振动增长率很高。基于Owen假说的结果表明,涡旋在流体弹性不稳定发生之前就已经脱落。分析了翅片几何形状对涡旋致力的影响。对于管阵列模型,粗翅片管和细翅片管阵列的康纳常数K值分别为6.14和7.25。独创性/价值 - 本文满足了研究鳍片几何形状对节距比小于 2 时(即低节距比)在水横流作用下管阵列上流体弹性不稳定性和涡流脱落的影响的需要。

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