Onset of Flash Boiling Under Rapid Depressurization Conditions Across Positive and Negative Pressure Ranges. A Theoretical Model

This work presents an analytical thermodynamic model capable of predicting the ONB across both positive and negative pressure conditions. By leveraging classical nucleation theory (CNT) and introducing normalized thermodynamic parameters, the model establishes a universal correlation applicable to various fluids over a wide temperature range (0.6 < Tr < 0.98). The model addresses two fundamental questions: (1) What is the minimal depressurization rate required to reach spinodal conditions? (2) For a given depressurization rate and initial conditions, at what pressure does nucleation occur?