Effects of evaporation coefficient, heat and mass transfer and thermal diffusion on photophoresis of a large highly viscous droplet

A theoretical description of the photophoretic motion of a large highly viscous spherical droplet (there is no circulation of matter inside the particle and interfacial surface tension forces) in a viscous binary gas mixture is carried out in the quasi-stationary approximation at low Reynolds and Peclet numbers. The obtained formulas allow, for small relative temperature differences in the vicinity of the droplet, to estimate the contribution of the direct influence of the evaporation rate and heat and mass transfer on the photophoresis rate, velocity distribution, temperatures and concentration of the volatile component, taking into account thermal diffusion. It is shown that photophoresis associated with convective heat and mass transfer takes place for highly heat-conducting particles.