Figure 13.

Collision events versus time for N_p = 20 particles (ϕ = 1%) in a turbulent flow: a) forcing as Re30 case of table 1 and ρ_p/ρ_f = 2; b) forcing as Re60 case of table 1 and ρ_p/ρ_f = 7; the four–digit number on the y–axis identifies the two interacting particles: for example, #i, j = 0412 indicates that particles #i = 4 and #j = 12 have collided. Red bullets for spherical particles, blue open circles for chiral particles.