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Mass Transfer
Diffusion
GATE 2015
Medium

For a binary mixture A-B, NA,NB are total molar fluxes; JA,JB are diffusive fluxes. Which is true for equimolar counter-diffusion?

  • ANA+NB=0 and JA+JB≠0
  • BNA+NB≠0 and JA+JB=0
  • CNA+NB≠0 and JA+JB≠0
  • NA+NB=0 and JA+JB=0

Explanation

Equimolar counter-diffusion means zero net convective flux (NA+NB=0), and diffusive fluxes always sum to zero for a binary mixture (JA+JB=0) by definition.

Source: GATE CH 2015 (2015)

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