Dynamics of attached turbulent cavitating flows

Wang, Guoyu; Şenocak, İnanç; Shyy, Wei; Ikohagi, Toshiaki; Cao, Shuai

doi:10.1016/s0376-0421(01)00014-8

Cited by 270 publications

(164 citation statements)

References 60 publications

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“…The following general lognormal distribution can be applied to approximately describe the nucleus-size spectral distribution [113]: 15) where Σ, ψ and ξ are fitting parameters, which depend on the considered fluid (ξ and Σ represent the average radius and the standard deviation of the distribution, respectively). Each nucleus evolves according to the Rayleigh-Plesset equation, that is, the radius (R 0 ) of the considered nucleus is used as the initial condition to solve equation (5.9).…”

Section: (A) the Rayleigh-plesset Equation For Single-bubble Dynamicsmentioning

confidence: 99%

Fluid dynamics of acoustic and hydrodynamic cavitation in hydraulic power systems

Ferrari¹

2017

Proc. R. Soc. A.

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Cavitation is the transition from a liquid to a vapour phase, due to a drop in pressure to the level of the vapour tension of the fluid. Two kinds of cavitation have been reviewed here: acoustic cavitation and hydrodynamic cavitation. As acoustic cavitation in engineering systems is related to the propagation of waves through a region subjected to liquid vaporization, the available expressions of the sound speed are discussed. One of the main effects of hydrodynamic cavitation in the nozzles and orifices of hydraulic power systems is a reduction in flow permeability. Different discharge coefficient formulae are analysed in this paper: the Reynolds number and the cavitation number result to be the key fluid dynamical parameters for liquid and cavitating flows, respectively. The latest advances in the characterization of different cavitation regimes in a nozzle, as the cavitation number reduces, are presented. The physical cause of choked flows is explained, and an analogy between cavitation and supersonic aerodynamic flows is proposed. The main approaches to cavitation modelling in hydraulic power systems are also reviewed: these are divided into homogeneous-mixture and twophase models. The homogeneous-mixture models are further subdivided into barotropic and baroclinic models. The advantages and disadvantages of an implementation of the complete Rayleigh-Plesset equation are examined.

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Section: (A) the Rayleigh-plesset Equation For Single-bubble Dynamicsmentioning

confidence: 99%

Fluid dynamics of acoustic and hydrodynamic cavitation in hydraulic power systems

Ferrari¹

2017

Proc. R. Soc. A.

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“…Model boundary condition has been formulated as follows [18,[20][21][22]: • constant and uniform velocity v in profile in the inlet cross-section, simultaneously local level of k, and ∈ indirectly by setting turbulence intensity ε and characteristic length scale λ 2 in…”

Section: General Concept and Computational Model Of Cavitating Devicementioning

confidence: 99%

Considerations of Impact of Venturi Effect on Mesophilic Digestion

Machnicka

Grűbel

Mirota

2015

Ecological Chemistry and Engineering S

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Hydrodynamic cavitation caused by the Venturi effect is one of the most promising methods of sewage sludge pre-treatment. This study has been carried out to investigate the effect of hydrodynamic cavitation on disintegration of activated sludge foam and mesophilic fermentation. Cavitation was generated in standard Venturi tube with the diameter ratio β = d0/d1 = 0.30, working at σ = 0.249. Detailed Computational Fluid Design (CFD) analysis in class of k-∈ model of internal flow has been presented. Obtained analytical investigation results confirmed the effect of strong disruption of microorganism cells and release of free organic substance into the liquid phase. After a short (30 minutes) pre-treatment, chemical oxygen demand increased by 8.63 times while Müller's disintegration degree was 50%. Moreover, undertaken mesophilic digestion trials brought significant improvement in biogas production.

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“…Wang et al [14] performed a series of experiments to study time-dependent cavitating flows around a Clark-Y hydrofoil. Figure 1 shows the shapes of cavities during an oscillation cycle.…”

Section: Evaluation Of Transport Equation-based Models (Tem)mentioning

confidence: 99%

“…The capability for simulating unsteady cavitating flows with the different cavitation models is further investigated. The computational domain and boundary conditions are given according to the experimental setup [14], which is shown in Figure 2. The Clark-Y hydrofoil is located at the center of the test section with the angle of attack equal to 8°.…”

Section: Evaluation Of Transport Equation-based Models (Tem)mentioning

confidence: 99%

A modified density based cavitation model for time dependent turbulent cavitating flow computations

Huang

Wang

2011

Chin. Sci. Bull.

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The predictive capability of transport equation-based cavitation models including the Kubota cavitation model (Model-1) and interfacial dynamics cavitation model (Model-2), is evaluated for the attached turbulent cavitating flows. In this study, the test problem is the unsteady cloud cavitating flows around a Clark-Y hydrofoil. Based on the evaluations of existing models, we identified the differences between these two vaporization and condensation processes in the affected region, and provided a modified density based cavitation model (Model-3). The numerical results of the cavity shapes, velocity distributions and dynamics of the cavity oscillations were compared to existing experimental data. Compared with the other cavitation models, a significant improvement for the numerical results of unsteady cavitating flows has been obtained with the new model. Our study provides the information for further modeling development. CFD, cavitating flows, cavitation model Citation:Huang B, Wang G Y. A modified density based cavitation model for time dependent turbulent cavitating flow computations.

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Dynamics of attached turbulent cavitating flows

Cited by 270 publications

References 60 publications

Fluid dynamics of acoustic and hydrodynamic cavitation in hydraulic power systems

Fluid dynamics of acoustic and hydrodynamic cavitation in hydraulic power systems

Considerations of Impact of Venturi Effect on Mesophilic Digestion

A modified density based cavitation model for time dependent turbulent cavitating flow computations

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