Accommodative dependence of thermophoresis in gases in the Knudsen regime
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The role of accommodation coefficients of energy, as well as tangential and normal momenta, in the phenomenon of thermophoresis of a spherical aerosol particle in the free molecule (Knudsen) regime is studied. The feature of this work is that it does not involve any assumptions about the distribution function of gas molecules reflected from the molecule’s surface. The accommodation coefficients are introduced in equations directly via momentum and energy flows. Expressions for the thermophoresis force and velocity, as well as for the thermal polarization of a particle (difference of temperatures in the direction of the incoming gas flow) have been obtained. It is shown that, in the Knudsen regime, the thermophoresis force and velocity depend only on the accommodation coefficients of momentum and do not depend on the accommodation coefficient of energy. The magnitude of thermal polarization, on the contrary, is directly proportional to the accommodation coefficient of energy and does not depend on the accommodation coefficients of momentum.
Keywordsthermophoresis accommodation coefficients of energy and momentum thermal polarization of the aerosol particle gas molecule
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