Consider (5.6.4), which is the solution of the Boltzmann equation with the relaxation model for the collision

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Consider (5.6.4), which is the solution of the Boltzmann equation with the relaxation model for the collision term, in the absence of external forces and spatial gradients, and when fα0 and the relaxation time τ are time-independent. Show that, according to this simplified equation, we have

where

Thus, according to the relaxation model for the collision term, every average value < χ > α approaches equilibrium with the same relaxation time.


Equation 5.6.4.

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