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Which equation represents the steady state connective mass transfer in a transfer zone within a flowing fluid?

Which equation represents the steady state connective mass transfer in a transfer zone within a flowing fluid? Correct Answer NA = kA ΔCA

The equation for connective mass transfer is NA = kA ΔCA where, NA is the flux of A, kA is the mass transfer coefficient of A within the transfer zone, ΔCA is the concentration difference across transfer zone. The flux of the solute is due to combination of molecular diffusion and the eddy diffusion.

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