The Diffusive Flux Vectors for a Mixture of Chemical Species

2 The Diffusive Flux Vectors for a Mixture of Chemical Species 

The collective flux vector associated with the property j(cj) is given by  

It is noted that, as for simple systems computing average quantities, integration over is equivalent to integration over Cj since the two velocities differ by a constant, and the integration is over the entire range of velocities. 

The specific species mass, heat and momentum fluxes can now be expressed by substituting the individual conservative properties for the function -ips-The diffusive mass flux vector is obtained if ips = nts.  

As shown earlier by (2.287), the sum of all the species mass flux vectors equals zero  

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