BLOWDOWN FROM A VENTED PARTIALLY FULL VESSEL

Theoretical and experimental modelling of a blowdown from a partially full vessel with a vent pipe pressurized with Freon 12 has been perfor med. The effect of nucleation and slip at the liquid-vapour-vapour int erface have been introduced and assessed. A simple theoretical model u tilizing the centred expansion fan equations was used to predict the a verage velocity of the diaphragm fragments after a blowdown. Good agre ement was provided by the homogeneous model (no velocity ratio, therma l equilibrium).