Rate of Entropy Production in Multicomponent Systems with Chemical Reaction

25-8 RATE OF ENTROPY PRODUCTION IN MULTICOMPONENT SYSTEMS WITH CHEMICAL REACTION 

The convective flux of entropy is given by p s, where v is the mass-average velocity of the mixture. The molecular flux of entropy with respect to v is deflned by 

it is necessary to proceed as follows to obtain an expression for sg - 

Step 1. Insert the molecular flux of entropy given by (25-37) into the defining equation for entropy production [i.e., (25-38)]  

Step 2. Perform the vector mathematics required in equation (25-39), which involves the divergence of the product of a vector and a scalar  

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