Near-Wake Characteristics and Acoustic Resonance Excitation of Crimped Spirally Finned Cylinders in Cross-Flow

Alziadeh, Mohammed; Mohany, Atef

doi:10.1115/1.4040549

Cited by 23 publications

(2 citation statements)

References 32 publications

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“…The sound pressure and velocity were measured for finned cylinders with three different fin densities (Eid and Ziada, 2011). The fins slightly reduce the strength of vortex shedding for isolated cylinders, but they significantly reduce the radiated sound before and during the acoustic resonance (Alziadeh and Mohany, 2018). Lumsden and Weaver (2010) have tested normal square and rotated square finned tube arrays in the air, while Wang and Weaver (2012) have conducted wind tunnel experiments on normal triangular and parallel triangular finned tube arrays.…”

Section: Finned Tubes In Air Cross Flowmentioning

confidence: 99%

Effect of fin density and fin height on flow-induced vibration behavior of finned tube arrays subjected to water cross flow

Desai

Sonare

2023

MMMS

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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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Section: Finned Tubes In Air Cross Flowmentioning

confidence: 99%

Effect of fin density and fin height on flow-induced vibration behavior of finned tube arrays subjected to water cross flow

Desai

Sonare

2023

MMMS

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“…The fin geometry and tube material jeopardize the stability of the tube array. In finned tube arrays, many studies have been carried out in the area of tube array failure due to acoustic resonance (Alziadeh and Mohany, 2018; Eid and Ziada, 2010). Some experimental work has been reported on vortex shedding and fluid elastic instability when tube arrays are subjected to both water crossflow, as well as air crossflow by considering different values of tube pitch ratio, different fin geometries and tube array patterns (Arshad et al , 2018; Hayat et al , 2019; Yadav and Mohanty, 2021).…”

Section: Introductionmentioning

confidence: 99%

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

Yadav¹,

Mohanty²

2021

WJE

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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.

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Numerical Analyze of the Flow Around an Airfoil Excited by Ultrasonic Radiation Force

Mehdari

Mohamed

2023

Lecture Notes in Mechanical Engineering

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Near-Wake Characteristics and Acoustic Resonance Excitation of Crimped Spirally Finned Cylinders in Cross-Flow

Cited by 23 publications

References 32 publications

Effect of fin density and fin height on flow-induced vibration behavior of finned tube arrays subjected to water cross flow

Effect of fin density and fin height on flow-induced vibration behavior of finned tube arrays subjected to water cross flow

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

Numerical Analyze of the Flow Around an Airfoil Excited by Ultrasonic Radiation Force

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