翅片密度和翅片高度对水错流作用下翅片管阵列流激振动特性的影响

IF 1.7 4区 材料科学 Q3 MATERIALS SCIENCE, MULTIDISCIPLINARY Multidiscipline Modeling in Materials and Structures Pub Date : 2023-01-05 DOI:10.1108/mmms-08-2022-0163
S. Desai, Mangalsing Narsing Sonare
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引用次数: 0

摘要

目的壳管式换热器失稳临界值的临界速度预测,对于避免水交叉流动引起的流激振动导致管件失效具有重要意义。翅片管换热器的流激振动受翅片高度、翅片节距、翅片材料、管阵、节距比、翅片类型、流体速度等参数的影响。本文采用节距比为1.79的普通方翅片管阵列,对管壳式换热器的流体弹性失稳特性进行了实验研究。设计/方法/方法在水流回路和振动测量系统的实验测试装置上,对平面阵列、2个翅片管阵列(翅片密度分别为3fpi和9fpi)和2个翅片管阵列(翅片高度分别为3mm和6mm)进行了实验测试。研究目的是评估鳍密度和鳍高度对不稳定阈值的影响。确定了不稳定阈值处的临界速度,以表征不同管阵的流体弹性不稳定行为。通过确定流体弹性失稳前小峰对应的斯特劳哈尔数,研究了管阵的涡脱落行为。发现翅片管阵列的流体弹性失稳行为是翅片管参数的函数。实验结果表明,增加翅片密度和翅片高度可以延迟翅片管阵列的失稳阈值。研究还发现,在相同螺距比下,翅片管阵列的临界不稳定速度比普通管阵列高。外箱的设计修改进一步降低了固有频率。这使得所有五管阵列都能达到明显的不稳定性。独创性/价值研究数据通过了解鳍高和鳍密度对普通方形翅片管阵列在水流交叉作用下流体弹性失稳阈值的影响,为现有的知识体系增加了价值。
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Effect of fin density and fin height on flow-induced vibration behavior of finned tube arrays subjected to water cross flow
PurposeThe prediction of critical velocity at instability threshold for shell and tube heat exchangers is important to avoid failure of tubes as a result of flow-induced vibrations due to water cross flow. The flow-induced vibration in finned tube heat exchangers is affected by various parameters such as fin height, fin pitch, fin material, tube array, pitch ratio, fin type, fluid velocity etc. In this paper, an experimental investigation of fluid elastic instability in shell and tube heat exchangers is carried out by subjecting normal square finned tube arrays of pitch ratio 1.79 to water cross flow.Design/methodology/approachThe five tube arrays, namely plain array, two finned tube arrays with 3 fpi and 9 fpi fin density, and two finned tube arrays with 3 mm and 6 mm fin height are tested in the experimental test setup with water flow loop and vibration measurement system. The research objective is to evaluate the effect of fin density and fin height on the instability threshold. The critical velocity at instability threshold is determined to characterize the fluid elastic instability behavior of different tube arrays. The vortex shedding behavior of the tube arrays is also studied by determining Strouhal number corresponding to the small peaks before fluid elastic instability.FindingsThe fluid elastic instability behavior of the tube arrays was found to be the function of fin tube parameters. The experimental results indicate that an increase in fin density and fin height results in delaying the instability threshold for finned tube arrays. It is also observed that critical velocity at instability is increased for finned tube arrays compared to plain tube arrays of the same pitch ratio. The design modifications in the outer box have resulted in further reduction in the natural frequency. This enabled to reach clear instability for all the five-tube arrays.Originality/valueThe research data add the value to the present body of knowledge by knowing the effect of fin height and fin density on the fluid elastic instability threshold of normal square finned tube arrays subjected to water cross flow.
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来源期刊
CiteScore
3.70
自引率
5.00%
发文量
60
期刊介绍: Multidiscipline Modeling in Materials and Structures is published by Emerald Group Publishing Limited from 2010
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