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Mass Fraction Diffusion

diffusion mass transfer mass transport multicomponent diffusion

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#1 Tsino


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Posted 26 July 2017 - 07:57 AM

Sorry about the amateurish equations, seems like Mathjax doesn't work here..
Why, when fick's law expressed in mass fractions, the total mixture density isn't inside the gradient: Flux=-( mixture density)*(Diffusion coeff)*gradient(component mass fraction)
I'm confused because the concentration of the component within the mixture is  C=( mixture density)*(component mass fraction)
What am i missing here?

Edited by Tsino, 26 July 2017 - 08:00 AM.

#2 Napo


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Posted 30 July 2017 - 07:05 PM



I attached related information, from the book: "Heat Transfer" of Y. Cengel.





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