Transport Properties of Lennard-Jones Mixtures:A Molecular Dynamics Simulation Study

摘要

Equilibrium molecular dynamics simulations in a canonical ensemble are performed to evaluate the transport coefficients of several Lennard-Jones(LJ)mixtures at a liquid argon states of 94.4 K and 1 arm via modified Green-Kubo formulas.Two component mixture of A and B is built by considering the interaction between A and A as the attractive(A)potential,that between A and B as the attractive potential(A),and that between B and B as the repulsive potential(R),labelled as AAR mixture.Three more mixtures-ARA,ARR,and RAR are created in the same way.The behavior of the LJ energy and the transport properties for all the mixtures is easily understood in terms of the portion of attractive potential(A%).The behavior of the thermal conductivities by the translational energy transport due to molecular motion exactly coincides with that of diffusion constant while that of the thermal conductivities by the potential energy transport due to molecular motion is easily understood from the fact that the LJ energy of AAR,ARR,and RAR mixtures increases negatively with the increase of A% from that of the pure repulsive system while that of ARA changes rarely.