Figure 16. Restitution coefficient Kr (collision recovery ratio) for clusters with various fractal dimensions Dβ as shown here. Note: ri, rj — radii of i and j model particles; rij — distance between i and j colliding model particles; rcol = ri +rj — collision distance; rijrcol — relative distance between i and j colliding particles; Eint — cluster’s internal energy; Eij — kinetic energy of collision; EijEint — relative collision energy.