The integral mean diffusivity for particle-gas mass transfer calculations under thermal plasma conditions

• A new integral mean diffusivity is proposed for the calculation of the mass transfer rate around a small particle immersed in a thermal plasma gas. Analogous to the integral mean thermal conductivity widely used for the corresponding heat transfer calculations, the integral mean diffusivity greatly facilitates the use of the convenient isothermal correlation, Sh=2.0, for the gas-particle mass transfer calculations. The calculation method accounts for both ordinary molecular diffusion and thermal diffusion. The latter has been found to play a significant role under thermal plasma conditions. The use of the integral mean diffusivity is illustrated with an example calculation on an Ar-He plasma system. © 1985 Plenum Publishing Corporation.

Nyckelord

analytical studies

exact and approximate solutions

Heat and mass transfer

molecular diffusion

small particles

thermal diffusion

thermal plasmas

ARGON

HELIUM

MASS TRANSFER

INTEGRAL MEAN DIFFUSIVITY

PLASMAS

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