A closed solution is given for the problem of a reaction between a solid sphere and a fluid, when a solid product is formed concentrically over the sphere. The mathematical expression for the concentration of the reactant A in the bulk of fluid is derived as a function of time for this system when pore-diffusion of A governs the overall reaction rate.
P. K. Karanth and N. A. M. Rao, Trans. Faraday Soc., 1967, 63, 355 DOI: 10.1039/TF9676300355
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