I have studied that mass transfer is of two types(adsbygoogle = window.adsbygoogle || []).push({});

then in later portion of the book I found that there is convective mass transfer too, I wanted to ask if both convective mass transfer and eddy diffusion are same ?

- Molecular mass transfer(diffusion)
- Eddy diffusion

I read this equation N_i = J_i + C_i V_m

where J_i = molar diffusive flux of component i related to molar average velocity

N_i =Total molar flux of component i

C_i V_m = convective flux of species i due to molar average velocity

lets take an example of a fluid flowing in pipe with some velocity x and I drop some ink in the flowing fluid , so now this is a binary mixture of fluid and ink . My question is what are absolute velocities of both species and what is the molar average velocity , if concentration is C1 and C2 respectively .I'm confused in the definition of these velocities .

Please help me out with this

- Why this equation is used in proving D_AB=D_BA , like in a ethanol water system where only diffusion is taking place and this equation have convective term too.
- convective diffusion term of particular species=(mole fraction)(N) , is this term and N_A = K_c (concentration difference) are same ? where K_c =convective mass transfer coefficient

**Physics Forums | Science Articles, Homework Help, Discussion**

Dismiss Notice

Join Physics Forums Today!

The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

# Mass Transfer

Can you offer guidance or do you also need help?

**Physics Forums | Science Articles, Homework Help, Discussion**