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Mass Fraction Diffusion

diffusion mass transfer mass transport multicomponent diffusion

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#1 Tsino

Tsino

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Posted 26 July 2017 - 07:57 AM

Hi
 
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?
 
Thanks! 

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


#2 Napo

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Posted 30 July 2017 - 07:05 PM

Tsino,

 

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

 

Napo.

 

 

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