5. The sketch shows a cylindrical hollow fiber with membrane walls. Species 'A' is undergoing steady-state diffusion through the membrane wall where its concentrations at the inner and outer membrane walls are CAI, and CA2, respectively. It can be assumed that the membrane wall eliminates any bulk diffusion effects and that the diffusion flux follows Fick's Law with a membrane diffusion coefficient, DAM- (a) Solve for the concentration profile of 'A' in the membrane wall in terms of the dimensions of the fiber and concentrations at R₁ and R₂. (b) Solve for the molar flux of 'A' leaving the outer wall of the membrane. A₂ X B₂ FIBER WALL

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Atomic diffusion in solids

In material science, diffusion can take place in solid, liquid, and gases. In solids, atomic diffusion can take place with the help of thermally activated and randomly vibrating atoms. The atomic diffusion in solids is complex and very slow in comparison to atomic diffusion in liquids and gases because the interatomic distance between the atoms is smaller in solids as compared to liquids and gases.