Diffusiophoresis and Photophoresis of Heated Large Nonvolatile Aerosol Spherical Particles
N. V. Malai1, E. R. Shchukin2, Z. L. Shulimanova3, D. N. Efimtseva1
1National Research University “Belgorod State University”, Belgorod, 308007, Russia
2Joint Institute for High Temperatures, Moscow, 125412, Russia
3Russian University of Transport, Moscow, 127994, Russia
Keywords: диффузио- и фотофорез, нагретые крупные нелетучие сферические частицы, diffusiophoresis and photophoresis, heated large nonvolatile spherical particles
Abstract
This paper describes a theoretical study of the steady motion of a large solid nonvolatile aerosol spherical particle, which contains thermal sources within itself, in a concentration gradient of binary gas mixture components. It is assumed that an average particle surface temperature significantly differs from the temperature of the binary gas mixture surrounding it. Equations of gas dynamics are solved taking into account the power-law dependence of the molecular transfer coefficients (viscosity, thermal conductivity, and diffusion) and the density of the gaseous medium on temperature. Under boundary conditions, diffusion and thermal slip are taken into account. Numerical estimates show that the diffusion and photophoretic forces and velocity substantially depend on the average particle surface temperature.
|
