Formation of directed particle flows during a gas mixture burning in a channel

Authors: Sadokhina T.D.
Published in issue: #10(27)/2018
DOI: 10.18698/2541-8009-2018-10-398
Category: Physics | Chapter: Chemical physics, combustion and explosion
Keywords: microparticles spraying, gas-thermal spraying, detonation spraying, deflagation-to-detanation transition (DDT), combustion wave, burning in a channel, coating efficiency, Navier-Stokes equation
Published: 08.11.2018

The problem of the deposition of microparticles on a solid substrate is considered. A method for its solution is proposed, based on formation of a directed stream of particles in a pulse of successive compression waves generated when a gaseous mixture develops in the channel. Dependence of deposition efficiency on channel length was obtained as well as uniformity of deposition in implementation of the most productive mode was estimated by numerical simulation methods. It has been shown that the regime with gradual acceleration of microparticles in a stream generated by an accelerating flame in a short channel provides more efficient deposition of microparticles on a substrate as compared to sputtering microparticles in a detonation impulse generated by the transition of combustion to detonation in a long channel.

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