  We derive a fluid-dynamic model for electron transport near a Dirac point in
graphene. The derivation is based on the minimum entropy principle, which is
exploited in order to close fluid-dynamic equations for quantum mixed states.
To this aim we make two main approximations: the usual semiclassical
approximation ($\hbar \ll 1$) and a new one, namely the `strongly-mixed state'
approximation. Particular solutions of the fluid-dynamic equations are
discussed which are of physical interest.
