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Engineering
Materials and Chemical Engineering
Mass Transfer: are both convective mass transfer and eddy diffusion the same?
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[QUOTE="Rahulx084, post: 6113128, member: 648365"] I have studied that mass transfer is of two types [LIST=1] [*]Molecular mass transfer(diffusion) [*]Eddy diffusion [/LIST] 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 ? 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 . [LIST] [*]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 [/LIST] Please help me out with this [/QUOTE]
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Engineering
Materials and Chemical Engineering
Mass Transfer: are both convective mass transfer and eddy diffusion the same?
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