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A COMPARISON BETWEEN THE KINETIC THEORY OF - page 6 / 25

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The vectors and and the second-order tensors are all functions of , and are given as solutions of integrodifferential equations [2]. The general diffusional driving forces, , include the concentration (or activity) driving force, the pressure gradient driving force, and the external driving force (BSL, p. 766):

(1.13)

(although for ideal gases, a somewat simpler expression can be used: BSL, p. 860).

1e. The fluxes in terms of the transport properties

When the Boltzmann equation has been solved, then one can express the fluxes in terms of the transport properties:

Species mass flux:(1.14)

Momentum flux:

(1.15)

Heat flux:

(1.16)

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