Semiemprical Estimate of the Temperature of the Medium in the Corona Discharge of a Plasma-Chemical Reactor
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Journal of Engineering Physics and Thermophysics, Vol. 93, No. 6, November, 2020
SEMIEMPRICAL ESTIMATE OF THE TEMPERATURE OF THE MEDIUM IN THE CORONA DISCHARGE OF A PLASMA-CHEMICAL REACTOR E. A. Bogoslov,a M. P. Danilaev,a S. V. Drobyshev,a and V. A. Kuklina,b
UDC 537.523.3+9
Temperatures have been identified in the corona hood and streamer of a plasma-chemical reactor during the formation of a polymer film with carbon nanosized particles. A semiempirical procedure has been proposed to estimate these temperatures. It has been shown that in the case where the temperature in the streamer volume is ~600oC and it is ~1400oC in the corona hood, polycrystalline carbon nanoparticles are formed in the plasma-chemical reactor whose agglomerates penetrate into the polymer film. Keywords: temperature, plasma-chemical reactor, barrier corona discharge, carbon nanoparticles. Introduction. Initializing processes of monomer polymerization in the plasma of a gas discharge (for example, a barrier corona discharge) of atmospheric pressure makes it possible to form polymer films with high adhesion to the substrate [1, 2]. However, the destruction of the polymer-forming monomer in the high-density zones of the discharge current inevitably results in the formation of carbon particles in the medium, also including nanoparticles of various allotropic forms, which can have significant effects on the physical and mechanical properties of the material being modified [3–10]. Therefore, in using such an approach to obtaining polymer film coatings, it is necessary to control the allotropic form of carbon particles. The formation of carbon particles of various allotropic forms is determined by the comprehensive action of the corona discharge currents and the temperature of the medium, which depends on the density of the discharge current, streamers′ frequency, and the place of their localization [1, 2, 11]. Numerous investigations into the corona discharge are only limited to the analysis of its spatiotemporal electric and gas-dynamic characteristics [12–17]. Direct measurements of temperature under these conditions are fraught with major technical difficulties, which is due to the effects of the measuring instruments on the processes occurring in the plasma-chemical reactor during the formation of polymer films. The use of spectroscopy methods, including the widely used Ornstein method, for determining temperature is limited by the mandatory requirement of complete thermodynamic equilibrium [18], which is, in practice, impossible under the conditions of high temperature gradients of a barrier corona discharge of alternating current at atmospheric pressure. The goal of this investigation is to provide an estimate of the temperatures in the corona hood and streamer in a plasma-chemical reactor during the formation of a polymer film with carbon nanosized particles. Method of Investigations. In a corona discharge, heat release due to electric current flow occurs in the regions of ionization and charge drift [19]. The first of these regions is r
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