CFD Simulation of Critical Heat Flux in a Tube (original) (raw)
This paper presents numerical simulations of the boiling flow in a tube with a Departure from Nucleate Boiling type of critical heat flux (CHF). Standard tables of CHF produced by the Russian Academy of Sciences were used as a data set. The simulations were performed with the multiphase code NEPTUNE_CFD V1.0.7. A simple criterion based on the void fraction at the wall was used for the CHF prediction. Four data series were selected from the tables. In every series, one of the following parameters was variable: the local equilibrium quality, the mass flux, pressure and the tube diameter. The remaining three parameters were fixed. In every data point, a numerical simulation was performed so as to find out the interval of the wall heat fluxes at which the boiling crisis occurs. NEPTUNE was able to quite accurately predict CHF in cases with high mass fluxes and high pressures. On the other hand, in one low-mass-flux case, the CHF in the calculation occurred at a wall heat flux as low as ...
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