On the Theory of Thermodiffusiophoresis of a Moderately Coarse Two-Layer Volatile Aerosol Particle

摘要

A hydrodynamic method with slip is used to construct a theory of uniform thermodiffusiophoretic transfer of a volatile high-viscosity two-layer particle under conditions in which one component of a moderately rarefied binary gas mixture undergoes phase transition on the particle's surface. The solid spherical core and high-viscosity sheath of the particle are concentric to each other. The theory suggests that, when moving, a twolayer volatile aerosol particle may be considered as a homogeneous particle with an effective thermal conductivity. The effect of the evaporation rate, interfacial temperature steps, and presence of the core on the rate of thermodiffusiophoresis is considered. Thermal diffusion terms, Stefan effects, and the heat evolution due to the convective transfer of the evaporating mass are taken into account. Under the same initial assumptions, formulas derived in this work are of wider practical significance than those following from the conventional approaches.