The viscosity of dense plasmas mixtures

We present estimations of the shear viscosity of a hydrogen-carbon mixture at various concentrations computed by molecular dynamics in the frame of Kubo currents obtained directly at the hydrodynamic limit through the Bernu-Vieillefosse formalism (Bernu B. and Vieillefosse P., Phys. Rev. Al 18 (1978) 2345). It is shown that, depending on the initial temperature of the mixture, a small amount of carbon in the hydrogen plasma can strongly reduce the viscosity (kinetic regime), but in some cases-the mixing can lead to an increase (strong coupling). Those results are fitted and extended to an arbitrary mixture with the help of a one-fluid model.