Thermophoresis of a Small Evaporating Particle in a High-Temperature Diatomic Gas

✍ Scribed by Xi Chen

• Publisher: Elsevier Science
• Year: 1997
• Tongue: English
• Weight: 202 KB
• Volume: 191
• Category: Article
• ISSN: 0021-9797
• DOI: 10.1006/jcis.1997.4979

✦ Synopsis

sented in Ref. ( 5) was restricted to a monatomic gas and Kinetic-theory analytical results are presented concerning the for completely diffuse reflection of atoms at the particle effect of intense evaporation on the thermophoretic force acting surface. The present paper intends to extend the previous on a spherical particle suspended in a high-temperature diatomic analysis (3, 4) to the case of high-temperature diatomic gas for the case of free-molecule regime. Molecule dissociation and gases in which molecule dissociation in the bulk gas and atom recombination are included in the analysis. It has been shown atom recombination at the particle surface are concerned, that evaporation may substantially enhance the thermophoretic but the gas temperature is not too high so that gas ionization force acting on a particle, especially for the case of the particle is still negligible. Incomplete thermal accommodation and a materials with low evaporation latent heat and small molecular combined specular and diffuse reflection of gas atoms or weight and at high gas temperatures. The values of the effective atomic and molecular thermal-accommodation factors do not af-molecules at the particle surface will be incorporated in the fect the thermophoretic force acting on a nonevaporating particle, analysis. The research results presented here will be useful but they affect significantly the evaporation-added thermophofor many applications such as the synthesis of fine powders retic force. It has been shown that the recombination fraction of by injecting solute droplets as the raw materials into a highatoms at the particle surface does not influence the thermotemperature gas reactor, the electron depletion technique by phoresis.