Question

What is the unit of mass transfer coefficient?

(a) ms

(b) m/s

(c) ms^2

(d) ms^-2

Answer 1

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.