The simulation of mass transfer processes of multi-component systems by Maxwell-Stefan model

To quantitatively study the interaction between each species of multi-component system during mass transfer in porous media, the Maxwell-Stefan model is used to simulate the pure diffusion process of CH ₄/Ar/H ₂ mixture gas in a single straight channel and the absorption process of C ₂H ₆/C ₃H ₈/N ₂ mixture gas in the active carbon. The interaction between each species is described and analyzed quantitatively. The results show that: for diffusion process, the interaction among species is caused by dragging effect of heavy species on light one; for absorption process, the interaction arises from the displacement of weak adsorbate by strong one; and the mass transfer process is dominated by bulk diffusion.