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The effective diffusivity of substrate in the solid, \(\mathcal{D}_{Ac}\) is dependent of substrate.(a) True(b) FalseThe question was asked during an interview.This interesting question is from Internal Mass Transfer and Reaction topic in portion Heterogenous Reactions of Bioprocess Engineering

Answer»

The correct choice is (b) False

To ELABORATE: The value of \(\mathcal{D}_{Ac}\) is a complex function of the molecular – diffusion characteristics of the SUBSTRATE, the tortuousness of the diffusion path within the solid, and the fraction of the particle volume available for diffusion. \(\mathcal{D}_{Ac}\) is CONSTANT and independent of substrate CONCENTRATION in the particle; this MEANS that \(\mathcal{D}_{Ac}\) does not change with position.



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