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Mass Diffusivity
The Chapman-Enskog theory gives for the mass diffusivity of a binary gas a relation similar to those for the viscosity and the thermal conductivity:
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Fig. 4.4. Thermal conductivity k, different approximations, Table 4.4, as function of the temperature T. |
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Fig. 4.5. Prandtl number Pr and specific heat at constant pressure cp of air, Table 4.4, as function of the temperature T. |
VT3 (ma + Mb)
Dab = DBa = const.—————- P— ————- . (4.24)
pazA B QDab
The dimension of DaB is [m2/s]. Since we do not intend to derive and use approximate relations for it, we renounce a detailed discussion and refer the reader to, e. g., [2, 3].
