NDLI: Numerical Simulation of Nonequilibrium Species Diffusion in a Low-Power Nitrogen

Content Provider	Springer Nature Link
Author	Wang, Hai Xing He, Qing Song Murphy, A. B. Zhu, Tao Wei, Fu Zhi
Copyright Year	2017
Abstract	Species distributions in a low-power arcjet thruster are investigated using a two-dimensional thermal and chemical nonequilibrium numerical model that incorporates the self-consistent effective binary diffusion coefficient approximation treatment of diffusion. Plasma flows in arcjet thruster with different input mole ratios of nitrogen to hydrogen are modelled. It is found that species separation due to nonequilibrium chemical kinetic processes occurs mainly in the regions where the dissociation and ionization of nitrogen and hydrogen species take place. The enrichment of nitrogen molecules at the fringes of the arc and hydrogen molecules near the anode wall of the thruster occurs mainly because the recombination processes of these two gases occur in different temperature ranges. In the expansion portion of the thruster nozzle, the gas residence times are of the same order as some chemical kinetic processes. Comparison between the nitrogen and hydrogen species profiles at the constrictor and thruster exit shows that the recombination of hydrogen ions and atoms are dominant kinetic processes near the thruster centreline, while the chemical reactions of nitrogen species are almost frozen in the high speed flow. The effects of temperature and pressure gradients on the species diffusion inside the arcjet thruster are also presented, with thermal diffusion found to have a much larger influence than pressure diffusion.
Starting Page	877
Ending Page	895
Page Count	19
File Format	PDF
ISSN	02724324
Journal	Plasma Chemistry and Plasma Processing
Volume Number	37
Issue Number	3
e-ISSN	15728986
Language	English
Publisher	Springer US
Publisher Date	2017-02-27
Publisher Place	New York
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Species diffusion Thermal plasma flow Arcjet thruster Inorganic Chemistry Classical Mechanics Characterization and Evaluation of Materials Mechanical Engineering
Content Type	Text
Resource Type	Article
Subject	Chemistry Surfaces, Coatings and Films Condensed Matter Physics Chemical Engineering

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