The calculation of dryout in a rod bundle

Abstract A model of annular two-phase flow is used to calculate dryout on the assumption that dryout occurs when the liquid flowrate in the film on the solid surfaces becomes equal to zero. To enable the calculation to be performed, the processes of entrainment and deposition of liquid droplets must be adequately described. The rod bundle is divided, for calculational purposes, into rod centred subchannels, and the liquid flows in the liquid films and as droplets in each subchannel are calculated. The agreement between experiment and calculation for dryout power is encouraging.

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