On the influence of thermal phenomena during cavitation through an orifice

Thermal properties of cryogenic fluids can profoundly change the nature cavitation since fluid pressure drop is not, anymore, only driving parameter this phenomenon. In research, we have conducted experiments inducing via a cylindrical orifice using Liquid Nitrogen as working and exploring regimes going from bubbly to full flashing. Among others, performed unsteady measurements derive speed sound during high-speed imaging understand evolution two-phase flow along pipe. our analysis use five dimensionless numbers describe conditions upstream downstream orifice, type transition taking place across orifice. paper, show that initial subcooling level ?Tsub superheat Rp are two parameters essential take into account metastability fluid. Therefore, propose new semi-empirical model for predicting effect thermal on cavitation. Specifically, define T which, multiplied by saturation at inlet temperature, allows us estimate reached cavitate.