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What is the unit of mass transfer coefficient?

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in Bioprocess Engineering by (80.7k points)
What is the unit of mass transfer coefficient?

(a) ms

(b) m/s

(c) ms^2

(d) ms^-2

This question was posed to me during an interview.

My enquiry is from External Mass Transfer in portion Heterogenous Reactions of Bioprocess Engineering

1 Answer

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Best answer
Right option is (b) m/s

Explanation: Molar flux form a bulk fluid at concentration CAb to the surface of a spherical particle of diameter dp at concentration CAs:

WA = kC (CAb-CAs)

Where, WA (Molar flux) = moles/m^2s

kC (Mass transfer coefficient) = m/s.

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