Detailed flow and force measurements in a rotated triangular tube bundle subjected to two-phase cross-flow

Pettigrew, M. J.; Zhang, C.; Mureithi, Njuki W.; Pamfil, D.

doi:10.1016/j.jfluidstructs.2005.02.007

Cited by 43 publications

(10 citation statements)

References 9 publications

(9 reference statements)

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“…However, it seems unlikely to happen inside the tube bundles due to the complex structure and high Reynolds number. Pettigrew et al (2004) carried out detailed flow measurements in a rotated triangular tube array subjected to two-phase cross-flow and identified that even at high void fraction up to 90% no evidence of periodic vortex shedding can be found.…”

Section: Research Backgroundmentioning

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: Research Backgroundmentioning

confidence: 99%

Development of a time delay formulation for fluidelastic instability model

Mureithi

2017

Journal of Fluids and Structures

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“…The domain is two-dimensional. This simplification is supported by the work of Pettigrew et al (2005) and Zhang et al (2007). The structured mesh is constructed with maximal cell size of approximately 1mm 2 .…”

Section: Case Descriptionmentioning

confidence: 99%

Effect of a new synthetic bubble model on forces in simulations of two-phase flows in tube bundles

Moerloose

Bral

Demeester

et al. 2021

European Journal of Mechanics - B/Fluids

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“…However, there is intrusion to the fluid by the tiny fiber probe. Another study [63] developed a fiber-optic probe to measure local void fraction. Each probe has a conical tip and is made from an optical fiber of 170 μm diameter.…”

Section: Advanced Void Fraction Measurement Techniquesmentioning

confidence: 99%

A Critical Review of Advanced Experimental Techniques to Measure Two- Phase Gas/Liquid Flow

Rahman¹,

Heidrick²,

Fleck³

2009

TOEFJ

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Gas assisted atomization is becoming increasingly important in many industrial applications such as physical, chemical and petroleum processes. In order to achieve proper atomization it is crucial to have proper mixing of gas (air) and liquid (water) in the feeding conduit before it enters into the nozzle. The flow regime, as well as the flow pattern and structure of the flow, are some of the important parameters that describe two-phase gas/liquid flows, and identify twophase gas/liquid flow regimes. It is also desirable to know under what conditions there is a transition among the different flow regimes (dispersed, stratified, annular, annular-dispersed, slug, wavy-slug, mist-annular). Due to the existence of relative movement in the interfaces and variable interactions between two phases, two-phase gas/liquid flow is a complex transport phenomenon compared to single-phase flow. Still, there is no effective technique to identify the two-phase gas/liquid flow regimes and it is even difficult to capture the accurate flow structures in smaller conduits in turbulent flow cases. Lack of solid and comprehensive theories for predicting and calculating the pressure and void fraction variations in two-phase air/water flow situations has left engineers without essential information for proper design of two-phase flow systems. This review is an effort to explore the state of the present advanced measurement techniques in this field of research. Subsequently, some of the advanced void fraction, photonics and pressure measurement techniques and correlations for identification of two-phase gas/liquid flow regimes and bubble sizes are investigated.

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Detailed flow and force measurements in a rotated triangular tube bundle subjected to two-phase cross-flow

Cited by 43 publications

References 9 publications

Development of a time delay formulation for fluidelastic instability model

Development of a time delay formulation for fluidelastic instability model

Effect of a new synthetic bubble model on forces in simulations of two-phase flows in tube bundles

A Critical Review of Advanced Experimental Techniques to Measure Two- Phase Gas/Liquid Flow

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