Consider a cylindrically shaped zone of diffusion (physically realized by the pr

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Consider a cylindrically shaped zone of diffusion (physically realized by the presence of a stationary diffusion medium B) of radius r1 where the diffusing species is A and the binary diffusion coefficient is (known and constant) DAB. Within the zone of diffusion a zero-th order homogeneous chemical reaction takes place with an unknown volumetric rate NA. The above zone of diffusion is enveloped by a layer of a specific type of material E of thickness d for which the binary diffusion coefficient of the diffusing species A in E is (known and constant) DAE . If the outer molar concentration value of species A of the above material layer is known and constant CA , as is the molar concentration value at the interface between the above two diffusion zones (assuming a negligible discontinuity) CA calculate both: the volumetric rate NA. the molar concentration value at the center of the above cylindrically shaped mass transfer system under steady state conditions.

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