Thermophoresis of Axially Symmetric Bodies
ROYAL INST OF TECH STOCKHOLM (SWEDEN) DEPT OF MECHANICS
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Thermophoresis of axially symmetric bodies is investigated to first order in the Knudsen-number, Kn. The study is made in the limit where the typical length of the immersed body is small compared to the mean free path. It is shown that in this case, in contrast to what is the case for spherical bodies, the arising thermal force on the body is not in general antiparallel to the temperature gradient. It is also shown that the gas excerts a torque on the body, which in magnitude and direction depends on the body geometry. Equations of motion describing the body movement are derived. Asymptotic solutions are studied.
- Fluid Mechanics