7.5. MOLECULAR DIFFUSION PLUS CONVECTION AND CHEMICAL REACTION

7.5A. Different Types of Fluxes and Fick's Law

In Section 6.2B the flux was defined as the molar flux of A in kg mol A/s · m2 relative to the molar average velocity νM of the whole or bulk stream. Also, NA was defined as the molar flux of A relative to stationary coordinates. Fluxes and velocities can also be defined in other ways. Table 7.5-1 lists the different types of fluxes and velocities often used in binary systems.

Table 7.5-1. Different Types of Fluxes and Velocities in Binary Systems
  Mass Flux (kg A/s · m2)Molar Flux (kg mol A/s · m2)
Relative to fixed coordinatesnA = ρ

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