Geodesic
Mathematical model of a two-temperature medium of gassolid nanoparticles with laser methane pyrolysis
Matematičeskoe modelirovanie, Tome 35 (2023) no. 4, pp. 24-50.

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A mathematical model of a two-phase chemically active medium of gas and solid ultrafine particles in the field of laser radiation with detailed heat transfer processes between gas and particles has been created. The mathematical model is a system of NavierStokes equations in the approximation of small Mach numbers and several temperatures, which describes the dynamics of a viscous multicomponent heat-conducting medium with diffusion, chemical reactions and energy supply through laser radiation. A computational algorithm has been developed for studying chemical processes in a gas-dust medium with single-velocity dynamics of a multicomponent gas under the action of laser radiation. This mathematical model is characterized by the presence of several very different temporal and spatial scales. The computational algorithm is based on the scheme of splitting by physical processes. For a two-phase medium from a multicomponent gas and nanodispersed solid particles, theoretical studies of multidirectional processes of thermal relaxation and specific heating-cooling of the components of a two-phase medium by laser radiation, thermal effects of chemical reactions, and intrinsic radiation of particles were carried out. It is shown that laser radiation can form a separation of the particle temperature from the gas temperature and provide the activation of methane with conversion to ethylene and hydrogen. The developed numerical model will find its application in the creation of new technologies of laser thermochemistry.
Keywords: two-phase medium, heat transfer, two-temperature medium, Navier-Stokes equations, numerical model, chemical reactions, methane.
Mots-clés : nanoparticles 
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V. N. Snytnikov; E. E. Peskova; O. P. Stoyanovskaya. Mathematical model of a two-temperature medium of gassolid nanoparticles with laser methane pyrolysis. Matematičeskoe modelirovanie, Tome 35 (2023) no. 4, pp. 24-50. http://geodesic.mathdoc.fr/item/MM_2023_35_4_a1/

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