+1 vote
in Mass Transfer by (37.1k points)
If all the components except 1 of the multicomponent diffusing mixture are inert, then what will be the expression for Diffusivity of component 1 in the mixture?

(a) D1m=(N1-Y1∑Nj)/(∑(YjN1-Y1Nj)/Dij)

(b) D1m=(Y1∑Nj)/(∑(YjN1-Y1Nj)/Dij)

(c) D1m=N1/(∑[(YjN1-Y1Nj)/Dij])

(d) D1m=(1-Y1)/(∑[Yj/Dij])

The question was asked during an online interview.

This interesting question is from Multicomponent Diffusion in chapter Diffusion in Solids and Molecular Diffusion in Fluids of Mass Transfer

1 Answer

0 votes
by (39.8k points)
Right answer is (d) D1m=(1-Y1)/(∑[Yj/Dij])

The best explanation: For an inert component Nj=0.

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