  We study, experimentally, the dynamics of a binary mixture of air-fluidized
disks. The disks are chiral since they incorporate a set of blades with
constant tilt. Both species are identical except for their blades tilt angle,
which is rotated by 180o in the second species. We analyze the phase behavior
of the system. Our analysis reveals a wide range of different fluid dynamics,
including chiral flow. This chiral flow features in its base state a large
vortex. We report, for certain ranges of relative particle density of each
species, inversion of the vorticity of this vortex. We discuss on the possible
mechanisms behind these chiral flow transitions.
