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Numerical simulation of two-phase critical flow in a convergent-divergent nozzle

Ishigaki, Masahiro ; Watanabe, Tadashi; Nakamura, Hideo  

In this research, two-phase critical flow with the phase change in the Super Moby Dick convergent-divergent nozzle is analyzed numerically by the CFD code FLUENT, and we discuss the performance of the numerical code by comparing the mass flow rates, pressure and void fractions by the numerical simulations with those values by the experiments. The cavitation model is applied together with the evaporation-condensation model. The estimations of mass flow rate agree with the experimental results for the low axial pressure difference. On the other hand, the mass flow rates are under-estimated when the axial pressure difference is high. It is found that the mass flow rate is improved much by taking into account the effect of the wall vapor generation.

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