3D CFD simulation of flashing flows in a converging-diverging nozzle

Liao, Yixiang; Lucas, Dirk

doi:10.1016/j.nucengdes.2015.06.015

Cited by 58 publications

(40 citation statements)

References 29 publications

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“…The constants , , and the classical Boussinesq eddy viscosity assumption are used. The SST model of Menter (1993), which is expected to perform well in the near wall regions and used successfully by Liao and Lucas (2015) for flashing inside long converging-diverging nozzle, has also been tested.…”

Section: Turbulence Modellingmentioning

confidence: 99%

Numerical simulation of subcooled and superheated jets under thermodynamic non-equilibrium

Lyras

Dembele

Schmidt

et al. 2018

International Journal of Multiphase Flow

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This is a PDF file of an unedited manuscript that has been accepted for publication. As a service to our customers we are providing this early version of the manuscript. The manuscript will undergo copyediting, typesetting, and review of the resulting proof before it is published in its final form. Please note that during the production process errors may be discovered which could affect the content, and all legal disclaimers that apply to the journal pertain. Highlights  FlashFOAM had been developed within the frame of OpenFOAM for simulating flashing jets  It accounts for the inter-phase heat transfer with the Homogeneous Relaxation Model (HRM).  A series of validation studies dedicated to long nozzles are reported.  The code has demonstrated its capability to capture the flow characteristics and vapour generation in cryogenic liquid jets.  The dependency of the geometry of the nozzles, pressure and subcooled degree on the vapour generation has been analysed.  The validation study has demonstrated that FlashFOAM can be used to simulate flash boiling scenarios accurately and predict the properties of flash atomisation.

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Section: Turbulence Modellingmentioning

confidence: 99%

Numerical simulation of subcooled and superheated jets under thermodynamic non-equilibrium

Lyras

Dembele

Schmidt

et al. 2018

International Journal of Multiphase Flow

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show abstract

“…Similar to the limitation of the last method with constant bubble size, the disagreement results from the prescription of a constant bubble number density and neglecting bubble dynamics, such as coalescence and break-up. The sensitivity study on the prescribed values for bubble number density was performed in the previous work of [32]. …”

Section: Simulation Resultsmentioning

confidence: 99%

Possibilities and Limitations of CFD Simulation for Flashing Flow Scenarios in Nuclear Applications

Liao

Lucas

2017

Energies

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Abstract:The flashing phenomenon is relevant to nuclear safety analysis, for example by a loss of coolant accident and safety release scenarios. It has been studied intensively by means of experiments and simulations with system codes, but computational fluid dynamics (CFD) simulation is still at the embryonic stage. Rapid increasing computer speed makes it possible to apply the CFD technology in such complex flow situations. Nevertheless, a thorough evaluation on the limitations and restrictions is still missing, which is however indispensable for reliable application, as well as further development. In the present work, the commonly-used two-fluid model with different mono-disperse assumptions is used to simulate various flashing scenarios. With the help of available experimental data, the results are evaluated, and the limitations are discussed. A poly-disperse method is found necessary for a reliable prediction of mean bubble size and phase distribution. The first attempts to trace the evolution of the bubble size distribution by means of poly-disperse simulations are made.

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“…For further details about the numerical setup, the reader is referred to [69,70]. The presumed bubble concentration is found to have a negligible effect on the results, and a value of 10 4 m −3 is adopted in all the cases.…”

Section: Cfd Simulation Of Bubble Growth In Superheated Liquidmentioning

confidence: 99%

Evaluation of Interfacial Heat Transfer Models for Flashing Flow with Two-Fluid CFD

Liao

Lucas

2018

Fluids

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Abstract:The complexity of flashing flows is increased vastly by the interphase heat transfer as well as its coupling with mass and momentum transfers. A reliable heat transfer coefficient is the key in the modelling of such kinds of flows with the two-fluid model. An extensive literature survey on computational modelling of flashing flows has been given in previous work. The present work is aimed at giving a brief review on available theories and correlations for the estimation of interphase heat transfer coefficient, and evaluating them quantitatively based on computational fluid dynamics simulations of bubble growth in superheated liquid. The comparison of predictions for bubble growth rate obtained by using different correlations with the experimental as well as direct numerical simulation data reveals that the performance of the correlations is dependent on the Jakob number and Reynolds number. No generally applicable correlations are available. Both conduction and convection are important in cases of bubble rising and translating in stagnant liquid at high Jakob numbers. The correlations combining the analytical solution for heat diffusion and the theoretical relation for potential flow give the best agreement.

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3D CFD simulation of flashing flows in a converging-diverging nozzle

Cited by 58 publications

References 29 publications

Numerical simulation of subcooled and superheated jets under thermodynamic non-equilibrium

Numerical simulation of subcooled and superheated jets under thermodynamic non-equilibrium

Possibilities and Limitations of CFD Simulation for Flashing Flow Scenarios in Nuclear Applications

Evaluation of Interfacial Heat Transfer Models for Flashing Flow with Two-Fluid CFD

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