Flow Periodicity and Acoustic Resonance in Parallel Triangle Tube Bundles

Ziada, Samir; Oengören, A.

doi:10.1006/jfls.1999.0259

Cited by 52 publications

(23 citation statements)

References 14 publications

(8 reference statements)

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“…The qualitative equivalence between VIV and the transverse seiching in open channel flow was observed in the experimental investigations by Oengören and Ziada [10][11][12][13] on acoustic resonance in tube bundles. In these studies, which focused on the typical frequencies of the phenomenon, the existence of a lock-in region straddling the resonance condition was confirmed for the case of water waves.…”

Section: Introductionmentioning

confidence: 69%

Vortex-induced cross-flow seiching in cylinder arrays

Defina¹,

Pradella²

2014

Advances in Water Resources

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Section: Introductionmentioning

confidence: 69%

Vortex-induced cross-flow seiching in cylinder arrays

Defina¹,

Pradella²

2014

Advances in Water Resources

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“…A narrow band of peak appears in the turbulence and pressure spectra as shown in Figure , rotated square D. Weaver et al, 1993), normal triangular (Polak & Weaver, 1995;S Ziada, 1998) and rotated triangular tube arrays S Ziada & Oengören, 2000).…”

Section: Flow Periodicity In Tube Arraysmentioning

confidence: 93%

Development of a time delay formulation for fluidelastic instability model

Mureithi

2017

Journal of Fluids and Structures

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Tube arrays in industrial components such as heat exchangers and steam generators are susceptible to damage due to fluidelastic instability (FEI). This study focuses on the modelling of fluidelastic instability in tube arrays subjected to cross-flow. There is agreement on the idea of introducing a time delay in FEI models. Although it is one of the key parameters for FEI models, the phenomenon behind this time delay is still subject to many possible explanations, and the underlying physics is still not well understood.In the present work a new time delay formulation for the class of the quasi-steady FEI models is derived in the frequency domain in the form of an Equivalent Theodorsen Function.Unsteady and quasi-static fluid forces were measured to develop the time delay formulation.The effect of Reynolds number on the static force coefficients was also investigated. The time delay function was found to be also dependent on the Reynolds number which implies that the fluidelastic instability is also Reynolds number dependent. Comparison to other time delay functions proposed in the quasi-steady and quasi-unsteady models is made. An initial overshoot in the lift force was observed for the present model.

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“…In general, the investigated bundles will be classified into small, medium and large tube spacings. The details of the experimental techniques used in this study can be found in Ziada & Oengoeren (1992, 1993, 2000 and Oengoeren & Ziada (1992a, 1992b, 1998.…”

Section: Vorticity Shedding and Acoustic Resonance Mechanismsmentioning

confidence: 99%

“…As a result of these combined geometrical constraints, i.e. free flow lanes through a staggered tube array, the mechanisms of flow instabilities are expected to be more complex in these arrays (Ziada & Oengoeren, 2000).…”

Section: Parallel Triangle Arrays Vorticity Sheddingmentioning

confidence: 99%

“…Investigation of the acoustic resonance of parallel triangle arrays (Ziada & Oengoeren, 2000) indicated that for most of these arrays, the critical velocities for the onset of acoustic resonances cannot be ABCM predicted from the Strouhal numbers of the natural vorticity shedding, which are detected at non-resonant conditions. This feature is different from that of normal triangle arrays, but similar to the acoustic behavior of in-line arrays.…”

Section: Acoustic Strouhal Numbers In Parallel Triangle Arraysmentioning

confidence: 99%

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