An investigation of two-dimensional flows of nucleating and wet steam by the time-marching method

Bakhtar, F.; Tochai, M.T. Mohammadi

doi:10.1016/0142-727x(80)90003-x

Cited by 91 publications

(43 citation statements)

References 5 publications

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“…Hill [20], Wegener [21] Moore [22] modified the Oswatisch's model for the low-pressure wet steam and moist gas nucleation in Laval nozzles and the simulation results agreed with the experimental data. After that in order to improve the calculation accuracy, Bakhtar [23] and Young [8] had put forward two dimensional models for nucleation at low pressure respectively.…”

Section: Introductionmentioning

confidence: 99%

Two-fluid model for simulation of supersonic flow of wet steam within high-pressure nozzles

Abadi

Kouhikamali

Atashkari

2015

International Journal of Thermal Sciences

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Section: Introductionmentioning

confidence: 99%

Two-fluid model for simulation of supersonic flow of wet steam within high-pressure nozzles

Abadi

Kouhikamali

Atashkari

2015

International Journal of Thermal Sciences

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“…In order to investigate the influences of friction drag on the SCWVSF, we do the simulation of several different friction drags according to the nozzle from ref. [17]. The initial stagnation pressure of inlet is p 0 =0.087 MPa.…”

Section: Influences Of Friction Dragmentioning

confidence: 99%

Influences of friction drag on spontaneous condensation in water vapor supersonic flows

Jiang

Liu

et al. 2009

Sci. China Ser. E-Technol. Sci.

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A mathematical model was developed to investigate the water vapor spontaneous condensation under supersonic flow conditions. A numerical simulation was performed for the water vapor condensable supersonic flows through Laval nozzles under different flow friction conditions. The comparison between numerical and experimental results shows that the model is accurate enough to investigate the supersonic spontaneous condensation flow of water vapor inside Laval nozzles. The influences of flow friction drag on supersonic spontaneous condensation flow of water vapor inside Laval nozzles were investigated. It was found that the flow friction has a direct effect on the spontaneous condensation process and therefore it is important for an accurate friction prediction in designing this kind of Laval nozzles.spontaneous condensation, supersonic flow, friction drag, nozzle

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“…When the multiphase flow is simulated through using two-fluid model, the major problem is the management of the discrete phase. Bakhtar and Mohammandi [9] once made numerical simulations on spontaneous condensing flow in a 2D cascade by processing the different phases with the method of homogenization and a series of corresponding experimental measurements [10,11] are conducted later as well. The processing of homogenization will improve the calculation efficiency, but the inter-phase interaction such as the momentum transfer as well as interphase velocity-slip are unable to be taken into account.…”

Section: Introductionmentioning

confidence: 99%

Numerical investigation and quantitative loss analysis of typical wet steam spontaneous condensation based on two-fluid model

et al. 2015

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Mass of one water molecule (g mol −1 ) γThe specific heat ratio R Gas constant (J mol −1 K −1 ) r * Critical radius (m) Kn Knudsen number T g Temperature of the ambient vapor (K) ξ Molecule fraction of condensation p d Hypothetical ambient pressure (Pa) r Drop radius (m) ρ g Gas phase conditions of density (kg m −3 ) ρ l Liquid phase conditions of density (kg m −3 ) u i i-Wise component of velocity (m s −1 ) p eff Effective pressure (Pa) g i i-Wise component of acceleration of gravity (m s −2 ) e Total energy per unit mass (J kg −1 ) λ eff Effective heat conductivity (W m −2 k −1 ) T g Temperature for gas phase (K) μ g Dynamic viscosity for gas phase (N s m −2 ) μ t Eddy viscosity for gas phase δ ij Kronecker symbol P rt Turbulent Prandtl number S m Source term for mass exchange (kg m −3 ) S u Source term for momentum exchange (kg m −2 s −1 ) S e Source term for energy exchange (J m −3 ) G Cunningham correction factor ρ m Local average density of mixed phase (kg m −3 ) u pi i-Wise component of droplet velocity (m s −1 ) Y Wetness fraction in mixture μ pEddy viscosity for liquid phase N Droplet concentration (kg −1 ) B(T g ) Second order virial coefficient Abstract A two-fluid model with the influence of interphase velocity-slip taken into account is proposed and a modified realizable k-ε turbulence model is put forward as well to make the equation set of two-fluid model closed. Based on this two-fluid model, numerical simulations are implemented on typical wet steam flow in different cases. Good consistency between numerical result and the experimental result implies that this two-fluid model is provided with high accuracy and wide applicability. The flow field analysis also shows that there exist several particular sites along the flow direction. These particular sites could illustrate the development mechanism of nucleation and droplet growing. In addition, further discussion about the flow in cascade then indicates that the presence of condensation has strong impact on the flow while the impact of interphase velocity-slip is relatively weaker. The composition of total pressure loss is present here, the majority of total pressure loss brought by condensation is about 8.78 % of inlet total pressure while the inter-phase velocity-slip just results in a small part of about 0.42 % of inlet total pressure, the rest of the total pressure loss is caused by pneumatic factors and this part is about 3.95 % of inlet total pressure. List of symbols INucleation rate (kg −1 s −1 ) θ Non-isothermal correction factor * Ke Cui Heat Mass Transfer 1 3 C(T g ) Third order virial coefficient k Turbulent kinetic energy (m 2 s −2 ) ε(ε ijk ) Turbulent dissipation rate (m 2 s −3 ) h fg

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An investigation of two-dimensional flows of nucleating and wet steam by the time-marching method

Cited by 91 publications

References 5 publications

Two-fluid model for simulation of supersonic flow of wet steam within high-pressure nozzles

Two-fluid model for simulation of supersonic flow of wet steam within high-pressure nozzles

Influences of friction drag on spontaneous condensation in water vapor supersonic flows

Numerical investigation and quantitative loss analysis of typical wet steam spontaneous condensation based on two-fluid model

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