CFD analysis of the subcooled boiling flow in a rod bundle

The subcooled boiling flow in a heated rod bundle was analyzed using a commercial computational fluid dynamics(CFD) code. The volume fraction of vapor and velocities and temperatures of liquid and vapor were predicted by applying the multidimensional two-fluid model and the subcooled boiling model to the rod bundle. The wall heat partition model due to forced convection, evaporation and liquid quenching was used and the vapor condensation and/or evaporation in the bulk were also taken into account. The vapor-induced turbulence was linearly superposed with the shear-induced liquid turbulence. The predicted void fractions in the mainstream and radial directions agree with the experimental results fairly well. The distributions of the liquid velocity and temperature, and rates of the vapor condensation-evaporation in the bulk were also reasonably predicted