  Viscous electron flow exhibits exotic signatures such as superballistic
conduction. Bending the geometry of the device is a must to observe
hydrodynamic effects. To this end, we build three antidot graphene
superlattices with different hole diameters. We measure their electrical
properties at various temperatures and under the effect of a perpendicular
magnetic field. We find an enhanced superballistic effect, suggesting the
effectiveness of the geometry at bending the electron flow. In addition,
superballistic conduction behaves non-monotonically with the magnetic field,
which is related with the ballistic-hydrodynamic transition. We also analyze
the device resistance as a function of the size of the antidot superlattice to
find characteristic scaling laws describing the different transport regimes. We
prove that the antidot superlattice is a convenient geometry for realizing
hydrodynamic flow, and the experiment provides valuable explanations for the
technologically relevant effects of superballistic conduction and scaling laws.
