On the stability of heat exchanger tube bundles, part I: Modified theoretical model

Lever, J. H.; Weaver, David

doi:10.1016/s0022-460x(86)80114-6

Cited by 91 publications

(45 citation statements)

References 13 publications

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“…Lever and Weaver (1986) pointed out that the single flexible tube in the rotated triangular tube array has essentially the same critical velocity as the corresponding fully flexible tube array and the dynamic instability occurs in the transverse direction. For simplicity, consideration is given here to the particular case of a single flexible tube in an otherwise rigid tube array which is free to move in the transverse direction.…”

Section: Methodologiesmentioning

confidence: 99%

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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Section: Methodologiesmentioning

confidence: 99%

Development of a time delay formulation for fluidelastic instability model

Mureithi

2017

Journal of Fluids and Structures

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“…This e!ect has been attributed to time delays between the #uid force and tube motion [17,18]. The system does not exhibit dynamic divergence because the non-linear &cubic' damping term forces the response to follow a stable limit cycle.…”

Section: Resultsmentioning

confidence: 99%

Application of Force-State Mapping to a Non-Linear Fluid–elastic System

Meskell

Fitzpatrick

Rice

2001

Mechanical Systems and Signal Processing

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“…Reducing the problem complexity and the amount of empirical coefficients required for a fundamental study is necessary to gain insights into the physics of the phenomenon. Weaver and Lever [18] and Lever and Weaver [19,20] verified that an ordinary simplified method to solve this problem is to use a single elastically mounted cylinder in a rigid array. They showed that a single flexible cylinder placed in a rigid array of cylinders undergo fluid-elastic instability at essentially the same stability threshold as the same array with all the cylinders flexible.…”

Section: Introductionmentioning

confidence: 99%

Instability behaviors of a cylinder array under both increasing and decreasing flow velocities

Zhang¹,

Jiang²,

Xiao³

2017

J. vibroeng.

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Abstract. This study aimed to investigate the effects of increasing and decreasing crossflow velocities on the fluid-elastic instability behaviors of cylinder arrays. The responses of an elastically mounted cylinder in a rigid normal square cylinder array in a water tunnel subjected to crossflow were tested. The responses were simultaneously obtained from both in-line and transverse vibrations. Results show that the responses under increasing freestream velocity differ from those under decreasing freestream velocity. Under decreasing freestream velocity, fluid-elastic instability was accompanied by nonlinear hysteresis, and the cylinder exhibiting this instability can remain in this state for a certain range of flow velocities. Added mass coefficients were also obtained. Two criteria for fluid-elastic instability were applied.

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On the stability of heat exchanger tube bundles, part I: Modified theoretical model

Cited by 91 publications

References 13 publications

Development of a time delay formulation for fluidelastic instability model

Development of a time delay formulation for fluidelastic instability model

Application of Force-State Mapping to a Non-Linear Fluid–elastic System

Instability behaviors of a cylinder array under both increasing and decreasing flow velocities

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