THE MOTION OF AEROSOL-PARTICLES UNDER CONDITIONS OF THE THERMODIFFUSION CHAMBER

The behavior of aerosol particles was studied, when gradients of tempe rature and the concentration of the gas mixture were maintained in the carrier gas. Such conditions are implemented, for example, in a therm odiffusion chamber that has recently been extensively used for the inv estigation of versatile properties of aerosol systems, as well as in d ifferent wall temperature channels, where aerosol particles precipitat e from the flow. The case is considered, where one of the mixture comp onents undergoes a phase transition on the surface of aerosol particle s. In solving this problem, the Knudsen number is assumed to be small, which enables us to confine ourselves to the Epstein approximation; t he gradients of temperature and concentration are also assumed to be s mall. It was established that the phase transition affects in the most critical way the particle velocity, and this effect is exhibited at a ny arbitrary small volatility of the substance on the particle surface . A comparison was made with the known result (in the absence of the p hase transition). The effect discovered reveals itself most clearly fo r the aerosol particles of high thermal conductivity.