A multiscale approach simulating generic pool boiling
A multiscale approach simulating generic pool boiling
The paper presents an application of the GENTOP model for phase transfer and discusses the sub-models used. Boiling of a heated surface under atmospheric conditions is simulated by the multi-field CFD approach. Sub-cooled water in a generic pool is heated up first in the near wall region leading to the generation of small bubbles. Further away from the bottom wall larger bubbles are generated by coalescence and evaporation. The CFD simulation bases on the recently developed GEneralized TwO Phase flow (GENTOP) concept. It is a multi-field model using the Euler-Euler approach and it allows the consideration of different local flow morphologies including transitions between them. Small steam bubbles are handled as dispersed phases while the interface of large gas structures is statistically resolved. The GENTOP sub-models need a constant improvement and separate, intensive validation effort using CFD grade experiments. Recently, a bubble dynamics model inside the heat partitioning approach has been developed and will be applied in GENTOP in future.
Keywords: multi-phase; boiling; GENTOP; multi-scale; CFD
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Lecture (Conference)
18th International Topical Meeting on Nuclear Reactor Thermal Hydraulics (NURETH-18), 18.-23.08.2019, Portland, USA -
Contribution to proceedings
18th International Topical Meeting on Nuclear Reactor Thermal Hydraulics (NURETH-18), 18.-23.08.2019, Portland, USA -
Nuclear Science and Engineering 194(2020)10, 859-872
Online First (2020) DOI: 10.1080/00295639.2020.1764265
Cited 3 times in Scopus
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- Final Draft PDF 1,1 MB Secondary publication
Permalink: https://www.hzdr.de/publications/Publ-29043