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High Temperature Material Processes (An International Quarterly of High-Technology Plasma Processes)

Impact factor: 0.189

ISSN Print: 1093-3611
ISSN Online: 1940-4360

High Temperature Material Processes (An International Quarterly of High-Technology Plasma Processes)


16 pages

ATOMIC RECOMBINATION AND ENERGY BALANCE IN A DECAYING COLUMN OF HOT HYDROGEN GAS

J. Stevefelt
Universitaire de Bourges, Rue Gaston Berger, BP 4043, 18028 Bourges Cedex, France. Present address: CELIA, Universite Bordeaux 1, 351 Cours de la Liberation, 33405 Talence Cedex, France
Stephane Pellerin
GREMI, CNRS-Universite d'Orleans, BP 6759, 45067 Orleans Cedex 2, France LASEP, Universite d'Orleans - Antenne de Bourges, BP4043, 18028 Bourges, France
J. Chapelle
LASEP, Centre Universitaire de Bourges, Rue Gaston Berger, BP 4043, 18028 Bourges Cedex, France

ABSTRACT

The spatial and temporal evolution of the concentration of atomic radicals [H] in a high-temperature hydrogen gas column has been evaluated, assuming constant pressures in the range from 0,25 to 1.0 bar (1 bar = 105 Pa) and temperature decaying by heat conduction while energy is released by the termolecular recombination processes. The initial concentration [H], assumed to correspond to thermal equilibrium at 5000 К, would increase with .pressure, but the recombination also becomes faster with increasing pressure. As a result, high concentration of atomic radicals rapidly becomes favoured by lower gas pressure after the temperature has decayed for a certain time. Also, operation at lower pressures would make the decay of [H] radicals less dependent upon the radius of the gas column.