Host: The Japan Society of Mechanical Engineers
Name : The 30th International Conference on Nuclear Engineering (ICONE30)
Date : May 21, 2023 - May 26, 2023
Modelling of the interphase momentum exchange mainly involves the bubble size and interphase forces in the subcooled boiling flow simulations utilizing the Euler-Euler two fluid framework. Several mechanisms comprising nucleation, coalescence, breakup and condensation should be primarily considered for bubble size modelling based on iMUSIG model. In present study, the closure models are developed in OpenFOAM and assessed with the DEBORA experiment data. Based on the previously developed five-component wall boiling model, different bubble coalescence and breakup models are employed to simulate the bubble size respectively. Guo model for coalescence, Luo model for breakup, Ranz-Marshall correlation for condensation were proved as the suitable closure models for bubble size modelling in boiling flow, by which the contributions of each mechanism are further analyzed. The liquid in the near-wall region approaches to the saturation state, the condensation effects may be neglected, while the condensation is of importance in the upstream due to the subcooled liquid. The breakup process may also be unimportant for small bubbles compared with the coalescence process in the near-wall or low-subcooling region.
