Numerical study on the nucleation law of water vapor condensation in laval nozzle.

Ni, Weijun; Sun, Runyu; Liu, Gang; Ma, Fei; Fan, Chaobo; Xie, Cong; Kang, Yong

Abstract

In order to explore the formation of condensed droplets and the process of agglomeration into droplets during the gas-liquid separation in the Laval nozzle, the wet gas is taken as the research object, and the numerical simulation model and control equations for the condensation of wet gas are established, which are simulated by Fluent software the effects of three parameters, the inlet relative humidity, the inlet and outlet pressure ratio and the inlet temperature, on the law of water vapor condensation and nucleation in the supersonic nozzle were analyzed. The results show that the higher the relative humidity is, the greater the peak value of the nucleation rate is, and the location of water vapor nucleation is getting closer to the throat of the nozzle; as the pressure ratio increases, the peak value of the nucleation rate becomes larger, and the pressure ratio is. It has an impact on the peak value of the nucleation rate; the lower the inlet temperature, the greater the peak value of the nucleation rate, and the inlet temperature has the greatest influence on the nucleation rate. When the inlet temperature is 285K, the nucleation rate reaches the maximum value and the nucleation position is closest to Throat, that is, the time of nucleation is the shortest, and the position of nucleation is the most forward. Therefore, in the actual application process, the length of the expansion section can be adjusted by the relative humidity of the wet gas, and the equipment can be simplified; at the same time, the dehydration efficiency of the Laval nozzle can be improved by increasing the inlet and outlet pressure ratio or reducing the inlet temperature of the nozzle.

Citation

NI, W., SUN, R., LIU, G., MA, F., FAN, C., XIE, C. and KANG, Y. 2023. Numerical study of the nucleation law of water vapor condensation in laval nozzle. In Proceedings of the 3rd International conference on new energy and power engineering 2023 (ICNEPE 2023), 24-26 November 2023, Huzhou, China. Piscataway: IEEE [online], pages 264-268. Available from: https://doi.org/10.1109/ICNEPE60694.2023.10429753

• Conference Name: 3rd International conference on new energy and power engineering 2023 (ICNEPE 2023)
• Conference Location: Huzhou, China
• Start Date: Nov 24, 2023
• End Date: Nov 26, 2023
• Acceptance Date: Nov 20, 2023
• Online Publication Date: Nov 26, 2023
• Publication Date: Dec 31, 2023
• Deposit Date: Mar 25, 2024
• Publicly Available Date: Mar 25, 2024
• Publisher: Institute of Electrical and Electronics Engineers (IEEE)
• Pages: 264-268
• DOI: https://doi.org/10.1109/ICNEPE60694.2023.10429753
• Keywords: Laval nozzle; Condensation nucleation; Dehydration; Numerical simulation
• Public URL: https://rgu-repository.worktribe.com/output/2278405