Two-Phase Eulerian/Lagrangian Model for Nucleating Steam Flow

Gerber, A. G.

doi:10.1115/1.1454109

Cited by 99 publications

(53 citation statements)

References 15 publications

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“…9, No. 4;2015 dynamic component of cavitation mass transfer models used earlier, based on a dynamics of cavitation bubble (Singhal et al, 2001;Zwart et al, 2004;Sauer et al, 2000). The new cavitation model takes into account viscosity of cavitating fluid in Reley-Plesset equation.…”

Section: Discussionmentioning

confidence: 99%

“…That could be explained by taking into account the fluid viscosity (80 sSt for hydraulic oil Shell T46). Primarily Zwart-Gerber-Belamri model was verified for water and with viscosity of 1 sSt during vapor cavitation (Zwart et al 2004). …”

Section: Discussionmentioning

confidence: 99%

“…For numerical simulation the cavitation model based on Interface capturing method was used (Zwart et al, 2004). The model consists of mass balance equation, momentum equation and turbulence model.…”

Section: Numerical Simulation Of Cavitating Flowmentioning

confidence: 99%

See 2 more Smart Citations

Numerical Cavitation Model for Simulation of Mass Flow Stabilization Effect in ANSYS CFX

Konstantinov¹,

Tselischev²,

Tselischev³

2014

MAS

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The aim of the article is improvement of numerical cavitation models for simulation of an effect of cavitation stabilization of fluid mass flow. The methods of development of a new dynamic component for a numerical model of cavitation mass transfer is presented in the paper. Application of the new method resulted in a new dynamic component for numerical model of cavitation mass transfer, which takes into account fluid viscosity in Reley-Plesset equation. Relying on the methods being considered fundamentally new hydroautomatic devices such as cavitation mass flow stabilizers and flow dividers could be designed. The new dynamic component has become the basis for the new numerical model of cavitation mass transfer. The effect of cavitation stabilization of fluid mass flow was simulated by this dynamic component. The numerical model was verified by experimental researches of the effect of cavitation stabilization of fluid mass flow in a jet element "pipe-pipe". The results of simulation showed that the new numerical model of cavitation mass transfer can simulate the jet pipes with the difference between results of simulation and experiment not exceeding 2,5% and visualizing a cavitation zone more adequate.

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

See 1 more Smart Citation

Numerical Cavitation Model for Simulation of Mass Flow Stabilization Effect in ANSYS CFX

Konstantinov¹,

Tselischev²,

Tselischev³

2014

MAS

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“…In recent years, Gerber [17] used the classical theory of nucleation and proposed a new numerical model (Eulerian-Lagrangian) to solve the two-phase compressible ows in steam nozzles and turbine blades. Then, Gerber and Kermani [1] presented a pressurebased Eulerian{Eulerian multi-phase model for nonequilibrium condensation in transonic steam ow.…”

Section: Introductionmentioning

confidence: 99%

Effects of non-equilibrium condensation on aerodynamics of the flow field in a steam turbine cascade

Esfe¹,

Kermani²,

Saffar‐Avval³

2017

Scientia Iranica

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Abstract. In the present paper, an in-house CFD code is developed using Roe scheme to simulate a condensing two-phase ow in blade to blade passage of a steam turbine. E ects of condensation on the ow eld of steam turbine rotor tip section are investigated for di erent outlet pressures. Firstly, comparison is performed between results of wet and dry cases. Then, e ects of outlet pressure variations on the ow eld are studied. Finally, e ects of condensation on di erent speci cations of the ow eld (total pressure loss coe cient, entropy generation, and deviation angle) are investigated. Also, the mechanism of ow deviation in the cascade ow eld is described. Condensation has a great in uence on the behavior of the ow eld based on the numerical results of this paper. It changes the out ow direction, and consequently the ow entering to the next blade deviates from its on-design condition; thus, additional losses are produced. For example, the value of deviation angle reaches 7:62 for wet case and exit Mach number M e = 1:45. Also, there are stagnation pressure loss and entropy generation due to non-equilibrium condensation that reduce the e ciency of the steam turbine.

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“…Gerber (Gerber et al, 2002) developed the Eulerian/Lagrangian and Eulerian/Eulerian two-phase models for predicting the condensation flow with the classical nucleation theory. The effects of friction factor on the condensation flows in the Laval nozzles were performed using the single fluid model (Jiang et al, 2009).…”

Section: Introductionmentioning

confidence: 99%

Numerical Simulation on Condensing Flow of Water Vapor of Wet Natural Gas Inside the Nozzle

Rong-ge¹,

Jin²,

Han³

et al. 2017

Frontiers in Heat and Mass Transfer

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Combines theories of gas dynamics, fluid dynamics and numerical heat transfer theory, the condensing flow characteristics of water vapor in wet natural gas within the Laval nozzle were studied. A mathematical model was developed to predict the spontaneous condensing phenomenon in the supersonic flows using the classical nucleation and droplet growth theories. The numerical approach is validated with the experimental data by using UDF and UDS modules in FLUENT software, which shows a good agreement between them, and showed that the mathematical model can better predict the parameter changes in the condensation process. The condensation characteristics of water vapor in the Laval nozzle are described in detail. The results show that the condensation process was a rapid variation of the vapor-liquid phase change both in the space and in time, the distribution of nucleation rate is restricted to a small area. The spontaneous condensation of water vapor will not appear immediately when the steam reaches the saturation state. Instead, it occurs downstream the nozzle throat, where the steam is in the state of supersaturation. The previous accumulation of Supersaturation has led to a nuclear process occurring in a very short time. The degree of supercooling was also dramatically reduced in this small area, and when it is below the supersaturation limitation, the nucleation process ceases to occur.

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Two-Phase Eulerian/Lagrangian Model for Nucleating Steam Flow

Cited by 99 publications

References 15 publications

Numerical Cavitation Model for Simulation of Mass Flow Stabilization Effect in ANSYS CFX

Numerical Cavitation Model for Simulation of Mass Flow Stabilization Effect in ANSYS CFX

Effects of non-equilibrium condensation on aerodynamics of the flow field in a steam turbine cascade

Numerical Simulation on Condensing Flow of Water Vapor of Wet Natural Gas Inside the Nozzle

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