The thermophoretic force acting on a spherical non-evaporating or evaporating particle suspended in a rarefied plasma

摘要: Previous thermophoretic force studies for a spherical particle suspended in rarefied plasma have been improved upon on the basis of more detailed analysis concerning interaction between charged sphere and ions electrons. Revised analytical expressions acting non-evaporating or evaporating extreme case free-molecule regime thin sheath are presented. Besides metallic limiting case, also obtained non-metallic cases particulate materials (with zero electrical conductivity). It has shown that ion electron components appreciably different from previous results. The is directly proportional to square radius. Evaporation may greatly enhance due additional contribution caused by reaction non-uniform evaporated mass flux flowing out particle. This evaporation-added significant with comparatively low latent heat evaporation at high temperatures. For without evaporation, there only small difference particles their forces. However, marked exist temperatures terms total forces because floating potential distributions surfaces two types cause local evaporated-mass along surface.