Effect of carrier gas pressure on vapor condensation and mass flow-rate in sonic nozzle
来源期刊：中南大学学报(英文版)2015年第12期
论文作者：DING Hong-bing WANG Chao CHEN Chao
文章页码：4864 - 4871
Key words：condensation gas-liquid flow; droplet growth; sonic nozzle; carrier gas pressure
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.
DING Hong-bing(丁红兵), WANG Chao(王超), CHEN Chao(陈超)
(Tianjin Key Laboratory of Process Measurement and Control, School of Electrical Engineering and Automation,
Tianjin University, Tianjin 300072, China)
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.
Key words:condensation gas-liquid flow; droplet growth; sonic nozzle; carrier gas pressure
