Vorticity shedding and acoustic resonance in tube bundles

Ziada, Samir

doi:10.1590/s1678-58782006000200008

Cited by 53 publications

(21 citation statements)

References 22 publications

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“…The behavior of the peaks observed in spectra can be explained by the fact that, in this longitudinal P/D range, the flow starts forming eddies after the second row, with an established regime after the third row, as observed by Ziada (2006). Therefore, because the frequency of the disturbance remains unaltered, both wavelength and amplitude of the disturbance are increased, due to the narrowing of the flow passage after the first row and the consequent acceleration of the flow.…”

Section: Results Inmentioning

confidence: 79%

“…By means of velocity and pressure measurements, as well as flow visualization in presence or not of acoustic resonance, Ziada (2006) describes the vorticity shedding excitation in tube bundles with in-line and staggered arrangements and its relation to the acoustic resonance mechanism. Vorticity shedding excitation is shown to be generated either by jet, wake, or shear layer instabilities.…”

Section: Paper Accepted April 2009 Technical Editor: Francisco R Cmentioning

confidence: 99%

See 1 more Smart Citation

Experimental study of the propagation of a far-field disturbance in the turbulent flow through square array tube banks

Endres¹,

Möller²

2009

J. Braz. Soc. Mech. Sci. & Eng.

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Section: Results Inmentioning

confidence: 79%

Section: Paper Accepted April 2009 Technical Editor: Francisco R Cmentioning

confidence: 99%

Experimental study of the propagation of a far-field disturbance in the turbulent flow through square array tube banks

Endres¹,

Möller²

2009

J. Braz. Soc. Mech. Sci. & Eng.

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“…The PSD spectra for large flow rates is given in figure 9. As mentioned by Ziada [11], a narrow band peak indicates that it is basically a periodic phenomenon. As illustrated in figure 9, the linear relationship between the frequency, f and the flow rate, Q has been observed.…”

Section: Maximum Frequencies Depending On Flow Ratementioning

confidence: 90%

Experimental studies of a single flexibly-mounted rod in a triangular rod bundle in cross-flow

et al. 2018

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Abstract. Experiments on flow-induced vibrations using a closely-packed triangular rod array with a pitch-todiameter ratio of 1.1 in water cross-flow was carried out at Paul Scherrer Institute. The bundle consists of 21 row of five rods in each one. Single flexibly-mounted test rod (TR) is in the fourth row in an otherwise fixed array. The test rod can freely move in the transverse and in-line direction. Two accelerometer sensors were attached at both ends of the TR to measure the rod response on the fluid flow. The effect of flow rate on the stability of the flexibly-mounted TR has been analysed. During experiments, it reveals a set of conditions and tendencies for the flow-induced vibration in the closely-packed multi-rod system. In mechanical, civil or nuclear engineering communities for the structural health monitoring vibration analysis is commonly used. This work is a contribution to investigations directed on development of SINQ (Swiss Spallation Neutron Source) target accident protection system. SINQ target is located in Paul Scherrer Institute (PSI).The mock-up of SINQ target with single flexiblymounted test rod (TR) in an otherwise rigid triangular rod array, with a pitch-to-diameter ratio of 1.1 has been used to experimentally study the flow-induced vibrations (FIV) due to the water cross-flow (flow is perpendicular to the rod axis). Cross-flow-induced vibrations are responsible for the vast majority of failures [1] in the multi-tube systems. Due to the mounting of the TR, the oscillating system has relatively small stiffness features.Although an experimental investigation of the system could be expensive compared with analytical or numerical solutions, it is necessary to get an exact knowledge of the excitation mechanism of FIV in the particular rod array. The behaviour of the vibrations in the rod bundle is tightly related to the geometrical or mechanical variation of the array layout [2]. In the case of liquid as a surrounding substance, there are several basic principles of FIV excitation, for example, vortex shedding, turbulence buffeting, fluid-elastic instability [3], [4]. Weaver and Grover [5], [6] experimentally found all mentioned excitation mechanisms in a tube bank with 19 flexibly mounted tubes surrounded by 116 rigid. Fluid excitation forces originated from vortex shedding and turbulence are experimentally measured in tightly packed rigid tube bundle by Liu et al. [7]. They conclude that a rod position is the most critical e-mail: upnere@gmail.com point regarding excitation forces acting on the system. Lin and Yu [8] have done experiments to analyse the influence of surrounding cylinders on critical velocity or vibration amplitude. Experimental results showed that the cylinder induced by the cross-flow vibrates initially only at its natural frequency around the onset of fluid-elastic instability but increasing the fluid velocity the cylinder vibrations include the frequency components of the surrounding cylinders too.In the present study, non-contact measurements are used to analyse the ...

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“…Similarly, the longitudinal mode was first mode. This mode shape is referred to herein as (1,4). The mode shapes of the other resonant frequencies were obtained in the same way.…”

Section: Acoustic Resonancementioning

confidence: 99%

Effect of Arrangement of Tube Banks on Acoustic Resonance

Hamakawa¹,

Nakamura²,

Asakura³

et al. 2012

OJFD

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In the present paper the attention is focused on effect of arrangement of tube banks on acoustic resonance which occurred in the two-dimensional model of boiler. We have examined the characteristics of vortex shedding and acoustic resonance generated from in-line and staggered tube banks. At the small tube pitch ratio in in-line tube banks, acoustic resonance of third and fourth mode in the transverse direction occurred. As the tube pitch ratio in the flow direction decreased, the vortex shedding frequency became broad-band. The alternative vortex shed from in-line tube banks. The multiple resonance modes were generated within the broad-band vortex shedding frequency. And the acoustic resonances of lower-order modes occurred at the higher gap velocity. On the other hand, at the small tube pitch ratio in staggered tube banks, acoustic resonance did not occurred, although the vortex shed at the resonance frequency in tube banks. The pressure drop at staggered tube banks was larger than that of in-line tube banks. The symmetric vortices were observed inside staggered tube banks at the small tube pitch ratio.

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Vorticity shedding and acoustic resonance in tube bundles

Abstract: This paper describes the vorticity shedding excitation in tube bundles and its relation to

Cited by 53 publications

References 22 publications

Experimental study of the propagation of a far-field disturbance in the turbulent flow through square array tube banks

Experimental study of the propagation of a far-field disturbance in the turbulent flow through square array tube banks

Experimental studies of a single flexibly-mounted rod in a triangular rod bundle in cross-flow

Effect of Arrangement of Tube Banks on Acoustic Resonance

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