The influence of a nonconservative force proportional to the velocity acting on a system described by the Boltzmann equation is analyzed. When this force is the only external action on the system, an H-theorem is proved, showing that the distribution function tends towards a Maxwellian with a...

The nonequilibrium entropy of a dilute gas under uniform shear flow is analyzed in terms of an expansion in powers of the shear rate. To this end, the Boltzmann equation for Maxwell molecules is exactly solved to super-Burnett order, the next two orders being also partially obtained. This allows...