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As shown in the above sketch, gaseous species, A reacts with spherical solid, B , after diffusing through the porous product layer, C , according
As shown in the above sketch, gaseous species, A reacts with spherical solid, B after diffusing through the porous product layer, according to
The reaction rate at the surface of is instantaneous and it can be assumed that quasisteadystate conditions prevail; ie accumulation terms in the conservation equations can be neglected. If the molar flux of with respect to fixed coordinates is essentially equal to the molecular diffusion flux with an effective diffusivity,
a solve for the concentration profile of in the product layer if its concentration at
b In reality, varies with time as is consumed and the molar flow rate of at is equal to the molar rate of disappearance of If the molar density of is constant, take an unsteadystate molar balance on and show that
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