Aeolian tone radiated from a circular cylinder with solid spiral fin in cross flow

Hamakawa, Hiromitsu; Adachi, Takaaki; Matsuoka, Hiroki; Hosokai, Kazuki; Nishida, Eiichi; Kurihara, Eru; Hayashi, H.

doi:10.1299/jfst.2014jfst0053

Cited by 2 publications

(1 citation statement)

References 17 publications

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“…The high density fins affect the velocity profile. However, it is dependent on the Reynolds number of external fluid flow (Hamakawa et al, 2010(Hamakawa et al, , 2014. The vortex shedding phenomenon is experimentally investigated, and results are compared with those of the bare tube with same base diameter.…”

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

View full text Add to dashboard Cite

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Applicability of the Equivalent Diameter Approach to Estimate Vortex Shedding Frequency and Acoustic Resonance Excitation From Different Finned Cylinders in Cross-Flow

Alziadeh

Mohany

2022

Journal of Pressure Vessel Technology

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This article explores the applicability of utilizing different equivalent diameter (Deq) equations to estimate the vortex shedding frequency and onset of self-excited acoustic resonance for various types of finned cylinders. The focus is on three finned cylinder types that are commonly used in industrial heat exchangers: straight, twist-serrated, and crimped spirally finned cylinders. Within each type of fins, at least three different finned cylinders are investigated. The results indicate that at off-resonance conditions, utilizing the appropriate equivalent diameter collapses the Strouhal number data within the typical Strouhal number variations of an equivalent diameter circular, bare cylinder. However, when acoustic resonance is initiated, the onset and the peak of resonance excitation in all of the finned cylinder cases generally occurred at a reduced flow velocity earlier than that observed from their equivalent diameter bare cylinders. This suggests that although utilizing the appropriate equivalent diameter can reasonably estimate the vortex shedding frequency away from acoustic resonance excitation, it cannot be used to predict the onset of acoustic resonance in finned tubes. The findings of this study indicate that the effective diameter approach is not sufficient to capture the intrinsic changes in the flow-sound interaction mechanism as a result of adding fins to a bare cylinder. Thus, a revision of the acoustic Strouhal number charts is required for finned tubes of different types and arrangements.

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Aeolian tone radiated from a circular cylinder with solid spiral fin in cross flow

Cited by 2 publications

References 17 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

Applicability of the Equivalent Diameter Approach to Estimate Vortex Shedding Frequency and Acoustic Resonance Excitation From Different Finned Cylinders in Cross-Flow

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