Abstract
The mutual diffusion under the condition of a constant density gradient of two kinds of Lennard-Jonse (L-J) liquids is studied by means of two dimensional molecular dynamics method. It is found that the diffusion velocity depends on the number density. In order to know the driving force for the mutual diffusion, the resultant force acting on particles in a region is divided into four kinds of forces. It is found that the diffusion velocity is affected strongly by two resultant forces out of four forces. The average values of resultant force with respect to the number of particles has a remarkable relation with the diffusion velocity.
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