Photo-thermoand diffusiophoresis of heated large non-volatile spherical aerosol particles in a binary gas mixture
N.V. Malay1, E.R. Shchukin2, Z.L. Shulimanova3
1Federal State Autonomous Educational Institution of Higher Education ”Belgorod State University”, Belgorod, Russia
2Joint Institute for High Temperatures of Russian Academy of Sciences, Moscow, Russia
3Russian University of Transport, Moscow, Russia
Keywords: фото- и термофорез, диффузиофорез, нагретые крупные нелетучие сферические частицы, бинарная газовая смесь, photo- and thermophoresis, diffusiophoresis, heated large non-volatile spherical particles, binary gas mixture
Abstract
Stationary motion of a large non-volatile spherical aerosol particle, inside which heat sources operate, under the effect of the gradients of temperature and binary gas mixture component concentrations in the external field is described in the Stokes approximation. The average surface temperature of the particle is assumed to significantly differ from the temperature of the surrounding binary gas mixture. The gas dynamics equations are solved with power temperature dependences of the coefficients of viscosity, thermal conductivity, diffusion, and density of the gaseous medium. Diffusive and thermal sliding motions are taken into account in the boundary conditions. Numerical estimates have shown that the photo-thermal and diffusiophoretic force and velocity significantly depend on the average temperature of the particle surface.
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