Diffusional mixing of a granular system differs from that of fluid systems in many respects, being the most important, the lack of particulate motion equivalent to molecular diffusion; i.e., there is no relative movement of particles without an energy input. If we can design a mixer that gives the grains the nec- Essary energy to flow and, at he same time, changes ran- Domly their velocities, we will, in principle, simulate the diffusive movements of molecules in a liquid or gas.
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