Abstract
A model for the heat transfer from a stationary, infinite plasma to a particle is developed so as to include rarefaction effects over the entire range of Knudsen numbers, and thermal and chemical nonequilibrium in the vicinity of the particle surface. The overall heat transfer rate is obtained by separately determining the contributions due to heavy species conduction and to energy transport by ion flow to the particle surface. Knudsen effects are accounted for by means of Sherman's interpolation formula for the conduction problem and its equivalent in electrostatic probe theory for the ion transport to the surface. Results are presented for argon plasmas in the pressure range 0.1–1 atm, and for particle sizes in the range 10–100 μm.
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