A single flexible tube in a rigid array as a model for fluidelastic instability in tube bundles

Khalifa, Ahmed A.; Weaver, David; Ziada, Samir

doi:10.1016/j.jfluidstructs.2012.06.007

Cited by 38 publications

(21 citation statements)

References 32 publications

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“…The prediction of the model for high Reynolds numbers is contradictory with Khalifa et al (2012)'s experiments who reported instability by negative damping, as well as several other studies for various pitch ratios. On the logarithmic scale, the trend established by these experiments is a straight line of coefficient 1, which is typical of the damping-controlled mechanism (it is 1=2 for the stiffness-controlled instability).…”

Section: Stability Of a Single Tube With The Quasi-steady Modelcontrasting

confidence: 94%

“…This means C L;y can turn negative within a few degrees. This is consistent with the work by Khalifa et al (2012) who observed that very small irregularities in the array had major effects on stability. This could also explain the large discrepancy in the collected data shown in Table 1.…”

Section: Effect Of the Angle Of The Configurationsupporting

confidence: 93%

“…Moreover, based on experimental evidence and their theoretical model, Weaver and Lever (1977) and Lever and Weaver (1986a,b) show that a single flexible tube becomes unstable at fairly the same velocity as in a fully flexible array. More recently, Khalifa et al (2012) review in the literature the work related to the study of single flexible tubes in an array. In their comprehensive review, they showed that this observation seems to be consistent especially for the parallel triangular array configuration.…”

Section: Theorymentioning

confidence: 99%

See 2 more Smart Citations

Effect of Reynolds number on the stability of a single flexible tube predicted by the quasi-steady model in tube bundles

Charreton

Béguin

et al. 2015

Journal of Fluids and Structures

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Section: Stability Of a Single Tube With The Quasi-steady Modelcontrasting

confidence: 94%

Section: Effect Of the Angle Of The Configurationsupporting

confidence: 93%

Section: Theorymentioning

confidence: 99%

See 1 more Smart Citation

Effect of Reynolds number on the stability of a single flexible tube predicted by the quasi-steady model in tube bundles

Charreton

Béguin

et al. 2015

Journal of Fluids and Structures

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“…Using the method of bandwidth, the equation (5) was used to calculate damping ratio in any medium in which the tube vibrates. (5) Where, ω 1 is the frequency of vibration (rad/s), ω 2 is the frequency of vibration (rad/s) and ω n is the natural frequency of vibration (rad/s).…”

Section: Damping Measurementsmentioning

confidence: 99%

Investigation of the Effects of the Incident Flow Angle on Vibration Behavior in Heat Exchanger Tube Bundle

Usman¹,

Khushnood²,

Nizam³

et al. 2019

Adv. Sci. Technol. Res. J.

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An experimental study on the incident flow angle effects on the vibration behavior was carried out on aluminum tube in parallel triangular tube bundle with P/D ratio of 1.375. Fluid elastic instability is the most fatal mechanism from all the vibration mechanisms and therefore must be dealt with a lot of attention. Experiments were performed on low speed water tunnel with the velocity of water ranges from 0.3 m/s to 0.7 m/s. The experiments were designed in a unique way to study the effects of incident flow angle on the vibration behavior. The monitored tube was mounted flexibly in an array of rigid tubes. The experiments were conducted on a flexible tube for different velocities ranging from 0.3 m/s to 0.7 m/s with different array rotated angles (0 to 90 degrees). It was observed that the vibration level was significantly high at 75 degree configuration as compared to other rotated angle configurations. It was also observed that the damping response is dispersed with all positive values, indicating that there is no instability in the tube.

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“…The fluidelastic interaction in cylinder arrays is complex, since it combines three types of instability (Khalifa et al, 2012;Païdoussis et al, 2010;Blevins, 1994):…”

Section: Introductionmentioning

confidence: 99%

Influence of the mass ratio on the fluidelastic instability of a flexible cylinder in a bundle of rigid tubes

Harran

2014

Journal of Fluids and Structures

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a b s t r a c tSeveral linear lumped-parameter models were proposed in the past to identify the main mechanisms underlying the cross-flow instability of a single flexible cylinder in tube bundles. Basing on such models, we analyze the influence of the mass ratio when the cylinder vibrates in the transverse direction, without structural damping (corresponding to a zero Scruton number). For two selected mass ratios, we focus on this linear interaction plotting the poles of the fluid-structure system as a function of the reduced velocity (root locus). This asymptotic approach allows a better understanding of the combined influence of the transient fluidelastic coupling and the mass ratio.where f S is the structural natural frequency and D the cylinder diameter. In addition to the geometric pattern influence, U c is affected by other phenomena:Vortex-Induced-Vibration domain and Movement-Induced-Vibration domain overlap when Scruton number is low (Weaver, 2008). According to Granger and Paidoussis (1996), this can explain some modeling difficulties for fluidelastic instability prediction.

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A single flexible tube in a rigid array as a model for fluidelastic instability in tube bundles

Cited by 38 publications

References 32 publications

Effect of Reynolds number on the stability of a single flexible tube predicted by the quasi-steady model in tube bundles

Effect of Reynolds number on the stability of a single flexible tube predicted by the quasi-steady model in tube bundles

Investigation of the Effects of the Incident Flow Angle on Vibration Behavior in Heat Exchanger Tube Bundle

Influence of the mass ratio on the fluidelastic instability of a flexible cylinder in a bundle of rigid tubes

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