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- W2912338676 abstract "Abstract The multi-field two-fluid modeling concept has been successfully used in the past to perform Computational Multiphase Fluid Dynamics (CMFD) simulations of forced-convection boiling. Since such simulations are normally performed at the RANS-level, they do not allow for resolving local phenomena at the bubble-scale level. Instead, closure laws making use of empirical correlations deduced from selected experimental data are adopted. As different data sets of reference frequently correspond to different, and not always overlapping, experimental conditions, their application introduces considerable uncertainties into the predictions of the overall CMFD models. It has been shown before (Podowski et al., 1997) that one way to improve the accuracy of computational models is to apply a multiscale modeling approach, in which single-bubble-nucleation-level models, validated against separate-effect experiments, are used to formulate mechanistic RANS-level closure laws. This paper presents a mathematically rigorous and physically consistent model of the bubble ebullition cycle, which takes into account the coupling of transient heat transfer between solid walls and the surrounding coolant during wall quenching period. The proposed modeling approach covers a large spectrum of the geometries pertaining to both experimental boiling test sections and nuclear reactor fuel assemblies. The new model has been parametrically tested and validated against experimental data. A good agreement between the model predictions and experimental data has been obtained. The overall objective of the current work is to establish a first-principle theoretical framework for the formulation of mechanistic ensemble-averaged closure laws compatible with existing CMFD solvers." @default.
- W2912338676 created "2019-02-21" @default.
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- W2912338676 date "2019-04-01" @default.
- W2912338676 modified "2023-09-27" @default.
- W2912338676 title "Analytical modeling of the effect of heater geometry on boiling heat transfer" @default.
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- W2912338676 doi "https://doi.org/10.1016/j.nucengdes.2018.12.020" @default.
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