CFD simulation of steam jet-induced thermal mixing in subcooled water pool

Moon, Young-Tae; Lee, Hee-Do; Park, Goon-Cherl

doi:10.1016/j.nucengdes.2009.08.003

Cited by 31 publications

(17 citation statements)

References 7 publications

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“…The momentum induced by condensation regimes where the steam-water interface remains outside the pipe was initially estimated in [22] using a momentum balance over a cylindrical control volume covering the condensing jet (SCRM model). With the assumptions of negligible drag forces, uniform pressure in the liquid, entrainment perpendicular to the axial flow direction, and taking averaged flow properties, the momentum balance was derived in [18,20] as…”

Section: Ehs/ems Model For Spargersmentioning

confidence: 99%

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Pool stratification and mixing induced by steam injection through spargers: CFD modelling of the PPOOLEX and PANDA experiments

Gallego-Marcos

Kudinov

Villanueva

et al. 2019

Nuclear Engineering and Design

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Spargers are multi-hole injection pipes used in Boiling Water Reactors (BWR) and Generation III/III+ Pressurized Water Reactors (PWR) to condense steam in large water pools. During the steam injection, high pool surface temperatures induced by thermal stratification can lead to higher containment pressures compared with completely mixed pool conditions, the former posing a threat for plant safety. The Effective Heat Source (EHS) and Effective Momentum Source (EMS) models were previously developed and validated for the modelling of a steam injection through blowdown pipes. The goal of this paper is to extend the EHS/EMS model capabilities towards steam injection through multi-hole spargers. The models are implemented in ANSYS Fluent 17.0 Computational Fluid Dynamics (CFD) code and calibrated against the spargers experiments performed in the PPOOLEX and PANDA facilities, analysed by the authors in [1] (Gallego-Marcos, I., et al., 2018). CFD modelling guidelines are established for the adequate simulation of the pool behaviour. A new correlation is proposed to model the turbulent production and dissipation caused by buoyancy. Sensitivity studies addressing the effect of different assumptions on the effective momentum magnitude, profile, angle and turbulence are presented. Calibration of the effective momentum showed an inverse proportionality to the sub-cooling. Differences between the effective momentum calibrated for PPOOLEX and PANDA are discussed. Analysis of the calculated flow above the cold stratified layer showed that the erosion of the layer is induced by the action of turbulence rather than mean shear flow.

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Section: Ehs/ems Model For Spargersmentioning

confidence: 99%

“…Pool modelling during a steam injection through spargers was performed in [18,19,20], where the concept of the Steam Condensation Region Model (SCRM) was used and implemented in the CFD code of ANSYS CFX. In the SCRM, equations for mass, momentum, and energy are solved in a control volume where steam is expected to condense completely.…”

Section: Introductionmentioning

confidence: 99%

Pool stratification and mixing induced by steam injection through spargers: CFD modelling of the PPOOLEX and PANDA experiments

Gallego-Marcos

Kudinov

Villanueva

et al. 2019

Nuclear Engineering and Design

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“…An experimental investigation of steam condensation and CFD analysis of thermal stratification and mixing in subcooled water of the incontainment refueling water storage tank (IRWST) of advanced power reactor 1400 (APR1400) were performed by Song et al [30], Kang and Song [31], and Moon et al [32]. The IRWST is a BWR SP technology adopted in a PWR design to reduce the containment failure risk by condensing steam in a subcooled pool.…”

Section: State Of the Art Reviewmentioning

confidence: 99%

Approach and Development of Effective Models for Simulation of Thermal Stratification and Mixing Induced by Steam Injection into a Large Pool of Water

Hua

Villanueva

Kudinov

2014

Science and Technology of Nuclear Installations

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Steam venting and condensation in a large pool of water can lead to either thermal stratification or thermal mixing. In a pressure suppression pool (PSP) of a boiling water reactor (BWR), consistent thermal mixing maximizes the capacity of the pool while the development of thermal stratification can reduce the steam condensation capacity of the pool which in turn can lead to pressure increase in the containment and thereafter the consequences can be severe. Advanced modeling and simulation of direct contact condensation in large systems remain a challenge as evident in commercial and research codes mainly due to small time-steps necessary to resolve contact condensation in long transients. In this work, effective models, namely, the effective heat source (EHS) and effective momentum source (EMS) models, are proposed to model and simulate thermal stratification and mixing during a steam injection into a large pool of water. Specifically, the EHS/EMS models are developed for steam injection through a single vertical pipe submerged in a pool under two condensation regimes: complete condensation inside the pipe and chugging. These models are computationally efficient since small scale behaviors are not resolved but their integral effect on the large scale flow structure in the pool is taken into account.

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“…They found both the CFD codes produce similar results and the surface divergence model produces more promising results. Moon et al (2009) incorporated steam condensation region model (SCRM) into CFX code to study the thermal mixing phenomena induced by a steam jet in a subcooled water pool, and they concluded the CFD results matches the experiment well except at near the nozzle exit. Multi-interfaces advection and reconstruction solver (MARS) method was applied by Takase et al (2002) to conduct an unsteady simulation of condensing steam jet injected downwards into cool water.…”

Section: Introductionmentioning

confidence: 99%