NDLI: A New Modified Pseudoequilibrium Calculation to Determine the Composition of Hydrogen and Nitrogen Plasmas at Atmospheric Pressure

Content Provider	Springer Nature Link
Author	André, P. Aubreton, J. Elchinger, M. F. Fauchais, P. Lefort, A.
Copyright Year	2001
Abstract	This paper proposes a modified pseudoequilibrium calculation, which gives almost the same results as those of kinetic calculations to determine the composition of hydrogen and nitrogen plasmas at atmospheric pressure. The computing time is two to three orders of magnitude faster than that of the kinetic calculations. First, according to experimental results, a relationship between the electron temperature T$_{e}$ and the heavy species one T$_{h}$ has been proposed. The ratio T$_{e}$/T$_{h}$ varies as a function of the logarithm of the ratio n$_{e}$/n e max , e max being the electron density in the plasma core for which equilibrium is achieved e max ~ 10 $^{ 23 }$ ). The kinetic calculations have been performed assuming the microreversibility where the backward kinetic rate coefficient k$_{b}$ is calculated by k$_{d}$/k$_{b}$=K$_{x}$, where k$_{d}$ is the direct kinetic coefficient and K$_{x}$ the molar fraction equilibrium constant. When electrons are involved in both direct and backward reactions, k$_{d}$ and K$_{x}$ are expressed as functions of T$_{e}$ . However, when the direct reaction involves electrons while the backward one is due to collisions between heavy species (or the reverse), a temperature T* between T$_{e}$ and T$_{h}$ is introduced. T* is determined as a function of the ratio of the electron flux to that of neutral species in such a way that T=T$^{e}$ for n$_{e}$ > 10$^{23}$ and T=T$_{h}$ for low values of n$_{e}$(n$_{e}$ < 10$^{15}$ m$^{−3}$). Compared to hydrogen, the nitrogen composition exhibits a very abrupt variation between 6000 and 6500 K, corresponding to a shift from the dissociation-dominated regime to that of ionization. It occurs because dissociation of nitrogen starts almost simultaneously with its ionization, which is not the case of H$_{2}$, for which dissociation is terminated long before ionization starts. If the charge transfer reaction, whose activation energy is low for both gases, is neglected, in both cases the electron density increases drastically below 9000 K. These results are quite similar to those obtained when calculating the composition with the multitemperature mass action law. The kinetic calculations are dominated by the reactions with a low activation energy: dissociation, dissociative recombination and charge transfer. Thus, a modified pseudoequilibrium calculation has been introduced, the plasma composition being calculated with the equilibrium constants corresponding to low activation energies[X$_{2}$ → 2X, e+X 2 + → 2X, X 2 + +X → X$^{+}$ + X$_{2}$ both for hydrogen (X=H) and nitrogen (X=N)] at the temperature T* between T$_{e}$ and T$_{h}$. The results are in very good agreement with those of the kinetic calculations.
Starting Page	83
Ending Page	105
Page Count	23
File Format	PDF
ISSN	02724324
Journal	Plasma Chemistry and Plasma Processing
Volume Number	21
Issue Number	1
e-ISSN	15728986
Language	English
Publisher	Kluwer Academic Publishers-Plenum Publishers
Publisher Date	2001-01-01
Publisher Place	New York
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Inorganic Chemistry Characterization and Evaluation Materials Mechanics Nuclear Physics, Heavy Ions, Hadrons Mechanical Engineering
Content Type	Text
Resource Type	Article
Subject	Chemistry Surfaces, Coatings and Films Condensed Matter Physics Chemical Engineering

Sl.	Authority	Responsibilities	Communication Details
1	Ministry of Education (GoI), Department of Higher Education	Sanctioning Authority	https://www.education.gov.in/ict-initiatives
2	Indian Institute of Technology Kharagpur	Host Institute of the Project: The host institute of the project is responsible for providing infrastructure support and hosting the project	https://www.iitkgp.ac.in
3	National Digital Library of India Office, Indian Institute of Technology Kharagpur	The administrative and infrastructural headquarters of the project	Dr. B. Sutradhar bsutra@ndl.gov.in
4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
5	Website/Portal (Helpdesk)	Queries regarding NDLI and its services	support@ndl.gov.in
6	Contents and Copyright Issues	Queries related to content curation and copyright issues	content@ndl.gov.in
7	National Digital Library of India Club (NDLI Club)	Queries related to NDLI Club formation, support, user awareness program, seminar/symposium, collaboration, social media, promotion, and outreach	clubsupport@ndl.gov.in
8	Digital Preservation Centre (DPC)	Assistance with digitizing and archiving copyright-free printed books	dpc@ndl.gov.in
9	IDR Setup or Support	Queries related to establishment and support of Institutional Digital Repository (IDR) and IDR workshops	idr@ndl.gov.in

Reduction of Chemical Reactions in Nitrogen and Nitrogen–Hydrogen Plasma Jets Flowing into Atmospheric Air

Transport Coefficients of Hydrogen and Argon–Hydrogen Plasmas

Decomposition Mechanism of Fluorinated Compounds in Water Plasmas Generated Under Atmospheric Pressure

Two-Temperature Transport Coefficients in Argon–Hydrogen Plasmas—II: Inelastic Processes and Influence of Composition

Spectroscopic Characterization of CH$_{4}$ + CO$_{2}$ Plasmas Excited by a Dielectric Barrier Discharge at Atmospheric Pressure

Decomposition of Acetaldehyde in Atmospheric Pressure Filamentary Nitrogen Plasma

Downstream Characterization of an Atmospheric Pressure Pulsed Arc Jet

Characterization of the Active Species in the Afterglow of a Nitrogen and Helium Atmospheric-Pressure Plasma

Effects of Vibrational Nonequilibrium on the Chemistry of Two-Temperature Nitrogen Plasmas

A New Modified Pseudoequilibrium Calculation to Determine the Composition of Hydrogen and Nitrogen Plasmas at Atmospheric Pressure

Similar Documents

Reduction of Chemical Reactions in Nitrogen and Nitrogen–Hydrogen Plasma Jets Flowing into Atmospheric Air

Transport Coefficients of Hydrogen and Argon–Hydrogen Plasmas

Decomposition Mechanism of Fluorinated Compounds in Water Plasmas Generated Under Atmospheric Pressure

Two-Temperature Transport Coefficients in Argon–Hydrogen Plasmas—II: Inelastic Processes and Influence of Composition

Spectroscopic Characterization of CH$_{4}$ + CO$_{2}$ Plasmas Excited by a Dielectric Barrier Discharge at Atmospheric Pressure

Decomposition of Acetaldehyde in Atmospheric Pressure Filamentary Nitrogen Plasma

Downstream Characterization of an Atmospheric Pressure Pulsed Arc Jet

Characterization of the Active Species in the Afterglow of a Nitrogen and Helium Atmospheric-Pressure Plasma

Effects of Vibrational Nonequilibrium on the Chemistry of Two-Temperature Nitrogen Plasmas

A New Modified Pseudoequilibrium Calculation to Determine the Composition of Hydrogen and Nitrogen Plasmas at Atmospheric Pressure