The mass transfer coefficient is a diffusion rate constant that relates the rate of mass transfer, mass transfer area, and concentration gradient:
kc = (dn/dt) /AΔCA
1. kc - the mass transfer coefficient [mol/(s·m2)/(mol/m3), or m/s]
2. dn/dt - the mass transfer rate [mol/s]
3. A - the effective mass transfer area [m2]
4. ΔCA - the driving force concentration difference [mol/m3].
Mass transfer coefficients can be estimated from many different theoretical equation, correlations and analogies which are functions of material and intensive properties and flow regime. The criterion for selection of the most applicable model is dependent on the materials and the system, or environment.
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