Effect of carrier gas pressure on vapor condensation and mass flow-rate in sonic nozzle

Abstract

Non-equilibrium vapor condensation of moist gas through a sonic nozzle is a very complicated phenomenon and is related to the measurement accuracy of sonic nozzle. A gas-liquid two-phase model for the moist gas condensation flow was built and validated by moist nitrogen experiment of homogeneous nucleation through a transonic nozzle. The effects of carrier gas pressure on position and status of condensation onset in sonic nozzle were investigated in detail. The results show that condensation process is not easy to occur at lower carrier pressure and throat diameter. The main factors influencing condensation onset are boundary layer thickness, heat capacity of carrier gas and expansion rate. All of results can be used to further analyze the effect of condensation on mass flow-rate of sonic nozzle.

Keywords

condensation gas-liquid flow / droplet growth / sonic nozzle / carrier gas pressure

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