Diffusivities and viscosities of some gases at elevated temperatures: Gas diffusivities in porous solids
Tóm tắt
A diffusion bridge apparatus has been used to measure diffusivities for the gas pairs CO2−N2, CO2−Ar, and CH4−N2 at temperatures ranging from 300 to 1000 K. The apparatus measured effective diffusivities which were transformed into ordinary diffusivities after calibration with a gas pair (CO2−N2) of known diffusivity. The apparatus was also used to measure the viscosities of the four gases over the same temperature range. The results were compared with the predictions of the Chapman-Enskog correlation (ordinary diffusivities and viscosities) and predictions for diffusion rates in porous solids developed in Monte Carlo simulations. Additional experiments examined the effect of changing pore structure on the diffusivities of gases.
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