Based on the three regions assumption of Zilliac

a self-pressurization model was established with the use of Peng-Robinson state of equation. An experimental apparatus of self-pressurization was constructed to verify the model. The result indicated that the saturation temperature was between the vapor and liquid temperatures

and more adjacent to the liquid temperature during the self-pressurization progress. The model showed a good performance in predicting the pressure and liquid temperature

but the formed temperature stratification in vapor region made it inaccurate to apply the lumped parameter method to model

so a model with more nodes in the vapor region was expected in future.