This work intended to model the cryogenic nitrogen spray under supercritical conditions using tabulated real-gas fluid properties. To investigate the effects of various equations of states (EoSs), four tables were generated using different EoSs such as the idea gas (IG), Peng-Robinson (PR), Soave-Redlich-Kwong (SRK), and Redlich-Kwong-Peng-Robinson (RKPR). For validations, the tabulated fluid properties using the CoolProp library were taken as the baseline case. The modelling results demonstrated that all the real-gas EoSs predicted similar spray features except for the IG EoS, which significantly underpredicted the density gradient and led to less intense jet diffusion and shorter penetration length. Of the four EoSs, the PR EoS exhibited the best agreement with the baseline case. Furthermore, the effect of ambient pressure on the spray development was also examined, ranging from the subcritical to the supercritical conditions. A highly diffusive and longer jet was observed under supercritical conditions (4 and 5 MPa). Thereafter, the effect of ambient temperature was also evaluated. It was found that the higher chamber temperature led to a more rapid decrease in density due to the better evaporation process, which resulted in a longer jet breakup length.
|Date made available
|KAUST Research Repository