Effects of external particles on the liquefaction property of natural gas in a Laval nozzle

In order to study the effects of external particles on the supersonic condensation process of natural gas, an experimental system to test the supersonic condensation efficiency is set up and the models for spontaneous (homogeneous) and heterogeneous condensation of natural gas are established. Vapor...

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Bibliographic Details
Published in:Powder technology 2018-11, Vol.339, p.894-902
Main Authors: Bian, Jiang, Cao, Xuewen, Yang, Wen, Du, Han, Yin, Pengbo
Format: Article
Language:English
Subjects:
Charged particles
Computational fluid dynamics
Condensation
Droplets
External particles
Flow control
Growth rate
Heterogeneous condensation
Laval nozzle
Liquefaction
Liquid flow
Natural gas
Nozzles
Nucleation
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Summary:In order to study the effects of external particles on the supersonic condensation process of natural gas, an experimental system to test the supersonic condensation efficiency is set up and the models for spontaneous (homogeneous) and heterogeneous condensation of natural gas are established. Vapor and liquid flow control equations are derived based on the two-fluid Euler model, and internally consistent classical theory and Gyarmathy's model are used to calculate the droplet nucleation rate and growth rate respectively. The results show that the due to the inhomogeneous condensation caused by the external particles, the measured droplet radius is larger, but the number of droplets is smaller in the experiment. With the increase of external particle concentration, the spontaneous condensation is gradually suppressed and heterogeneous nucleation is becoming more and more obvious. The increase of external particles concentration is beneficial to the condensation and the total humidity becomes larger, but when the external particle concentration increases to a certain value, the promotion effect is limited. In addition, other parameters such as the radius of particles also have influence on the heterogeneous condensing flow of natural gas. [Display omitted] •Physical and mathematical models for heterogeneous condensation are established.•Experimental system to test the supersonic condensation efficiency is set up.•Condensation parameters of spontaneous and heterogeneous nucleation are compared.•Effects of external particles on heterogeneous condensation process are analyzed.
ISSN:0032-5910
1873-328X
DOI:10.1016/j.powtec.2018.08.077