Snapshots of the spatial distribution of heavy (red) and light (blue) particles in turbulent flow with St=0.6 and Re∼105, taken from numerical simulations [13, 14]. (Top) Two-dimensional projection of a slice of particle positions with sides 400η×400η×10η, where η is the inner length scale. (Bottom) Same slice but zoomed in to 205η×205η×10η. While bubbles accumulate in the cores of filamentary vortical regions, heavy particles are ejected from them and cluster in regions of larger fractal dimension (∼2.5). This phenomenon produces demixing (or segregation) of different particle species.