Status of dynamic water film model development in 3-D CFD code GASFLOW-MPI for analysis of passive containment cooling system

Xiao, Jianlin; Travis, J.R.; Bottoni, M.

doi:10.1016/j.anucene.2017.04.007

Cited by 21 publications

(3 citation statements)

References 10 publications

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“…However, these current codes were lack of the experiment validation and did not consider the gradient distribution of parameters in the direction of the channel gap height, so their application was limited. Recently, in the 3-D GASFLOW-MPI CFD code, a dynamic water film model was developed by Xiao et al [17] through adding essential interphase exchange source terms in the governing equations of mass, momentum, and energy. ey believed that this film model in GASFLOW-MPI code could efficiently analyze the heat removal capacity of PCCS, from the excellent comparisons of the calculation results between CFD code and exact numerical solution (ENS).…”

Section: Introductionmentioning

confidence: 99%

Numerical Investigation of Water Film Evaporation with the Countercurrent Air in the Asymmetric Heating Rectangular Channel for Passive Containment Cooling System

2020

Science and Technology of Nuclear Installations

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Passive containment cooling system (PCCS) is an important passive safety facility in the large advanced pressurized water reactor. Using the physical laws, such as gravity and buoyancy, the water film/air countercurrent flow is formed in the external annular channel to keep inside temperature and pressure below the maximum design values. Due to the large curvature radius of the annular channel, one of the short arc segments is taken out, as a rectangular channel, to analyze the main water film evaporation heat transfer characteristics. Two numerical methods are used to predict the water film evaporative mass flow rate during the heat transfer process in the large-scale rectangular channel with asymmetric heating when the water film temperature is not saturated. At the same time, these numerical simulation results are validated by the experiment which is set up to study water film/air countercurrent flow heat transfer on a vertical back heating plate with 5 m in length and 1.2 m in width. It is shown that the maximum deviation between numerical simulation and experiment is 30%. In addition, the influences on these parameters, such as heat flux, evaporative mass flow rate, and water film thickness, are evaluated under the different tilted angles of the rectangular channel and horizontal plane, water/air inlet flow rates, water/air inlet temperatures, heating surface temperatures, and air inlet relative humidities. All these results can provide a good guidance for the design of PCCS in the future.

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Section: Introductionmentioning

confidence: 99%

Numerical Investigation of Water Film Evaporation with the Countercurrent Air in the Asymmetric Heating Rectangular Channel for Passive Containment Cooling System

2020

Science and Technology of Nuclear Installations

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“…Several studies have been performed to predict water film evaporation and condensation using different CFD codes. Xiao et al [8] developed a dynamic water film model in a 3-D GASFLOW-MPI code by adding essential interphase exchange source terms in the mass, momentum, and energy governing equations. They found that the code could efficiently analyse the heat removal capacity of a PCCS unit.…”

Section: Introductionmentioning

confidence: 99%

Numerical Simulation of Liquid Film Evaporation and Condensation for Water Reactors

Xia,

Ali,

Khaware

et al. 2024

Proceedings of the 9th World Congress on Momentum, Heat and Mass Transfer

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A detailed analysis of liquid film evaporation and condensation has become increasingly important, especially in water reactor designs. For example, the prediction of liquid film evaporation is critical to the design of Passive Containment Cooling Systems (PCCS), which are important passive safety facilities in modern Pressurized Water Reactors (PWR). To keep the maximum design values of pressure and temperature under control, a water/air counter-current flow is often employed within the external channel of the PCCS. It is thus essential to analyse the evaporation mass flow rate and heat transfer of the water film for the overall performance of PCCS. On the other hand, hydrogen might be released into the reactor containment during an incident due to cladding oxidation at elevated temperatures. Given the high flammability of gaseous hydrogen, it is paramount to know its local distribution in the containment building while considering wall condensation, which will increase the non-condensable gas concentration on the walls.Another example is evaluating the containment loads in the Light Water Reactor (LWR) plants and predicting their condensation behaviour in the presence of non-condensable gases. With the advantages of Computational Fluid Dynamics (CFD) and recent model developments, the numerical analysis of evaporation and condensation of liquid films has become more convenient than expensive experiments for real-world applications. In this paper, the numerical model of Eulerian Wall Film (EWF) implemented within Ansys Fluent® has been validated based on two canonical cases. The first one refers to the experiments performed by Hu et al. [1], where the heat transfer during the water film evaporation on a vertical plate has been studied. The average heat flux and water film evaporative ratio match the available experimental data well. The second case relates to the experiments done by Ambrosini et al. [2], also known as the "CONAN" case, where the wall film condensation in the presence of non-condensable substances has been studied under different steam mass fraction and velocity conditions. The surface heat flux and condensate mass flow rate also match the experimental measurements. The present numerical workflow using EWF could be applied to more complex devices for liquid film evaporation and condensation simulations.

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“…The 3D code GASFLOW-MPI has been modified to simulate the PCS water falling film in a more realistic way [70], [71]. Its results have been compared with COMMIX results and the model has been used to simulate AP1000 containment under different accident scenarios specially, for studying hydrogen risk under severe accident conditions [72]- [75].…”

Section: 22passive Containment Safety System (Pcs)mentioning

confidence: 99%

Development of an AP1000 3D full containment model using an innovative approach

Estévez-Albuja¹

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Status of dynamic water film model development in 3-D CFD code GASFLOW-MPI for analysis of passive containment cooling system

Cited by 21 publications

References 10 publications

Numerical Investigation of Water Film Evaporation with the Countercurrent Air in the Asymmetric Heating Rectangular Channel for Passive Containment Cooling System

Numerical Investigation of Water Film Evaporation with the Countercurrent Air in the Asymmetric Heating Rectangular Channel for Passive Containment Cooling System

Numerical Simulation of Liquid Film Evaporation and Condensation for Water Reactors

Development of an AP1000 3D full containment model using an innovative approach

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