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Thermal Sciences 2004. Proceedings of the ASME - ZSIS International Thermal Science Seminar II
June, 13-16, 2004, Bled, Slovenia

DOI: 10.1615/ICHMT.2004.IntThermSciSemin


ISBN Print: 978-9-61913-930-1

A contribution to multidimensional two-fluid modeling of subcooled boiling flow

pages 627-634
DOI: 10.1615/ICHMT.2004.IntThermSciSemin.770
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摘要

The need to investigate low-pressure subcooled boiling has recently appeared in reactor safety analyses. The topic of the present work is a multi-dimensional modeling of subcooled boiling flow using a two-fluid approach and calculation of local two-phase flow parameters (void fraction and bubble size). Phase-change and hydrodynamic mechanisms are modeled. The dependence of bubble diameter on local flow conditions was taken into account. A sensitivity analysis of closure equations highlighted the importance of lateral hydrodynamic mechanisms and variation of local bubble diameter in the modeling of subcooled flow boiling at low-pressure conditions. The evolutions of two-phase flow parameters in the radial and axial directions are calculated for experimental conditions from the literature [1] and compared to experimental results.

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