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An advanced two-fluid model has been developed in Japan Atomic Energy Agency (JAEA). In this model, an interface tracking method is combined with a two-fluid model. In this procedure, liquid clusters and bubbles larger than a computational cell are calculated using the interface tracking method, and those smaller than a cell are simulated by the two-fluid model. A turbulent dispersion force term is one of the most important constitutive equations for advanced two-fluid model. We have developed the new model for turbulent dispersion force and verified the developed model using the 3-dimensional two-fluid model code ACE-3D, and the comparisons between the results of the analyses and air-water two-phase flow experiments in 200 mm diameter pipe. In this study, to verify the applicability of developed model for middle diameter vertical pipe, we compared between the analyses of results and air-water two-phase flow experiments in 38 mm diameter pipe.

nihon kikai gakkai ronbunshū. b

Development of Numerical Procedure for Thermal Hydraulic Design of Nuclear Reactors with Advanced Two-Fluid Model (Applicability of Turbulent Dispersion Force Model for Middle Diameter Vertical Pipe)