The flow rate of grains through large orifices
is known to be dependent on its diameter to a 5/2 power
law. This relationship has been checked for big outlet sizes,
whereas an empirical fitting parameter is needed to reproduce
the behavior for small openings. In this work, we provide
experimental data and numerical simulations covering a
wide span of outlet sizes, both in three- and two-dimensions.
This allows us to showthat the laws that are usually employed
are satisfactory only if a small range of openings is considered.
We propose a new law for the mass flow rate of grains
that correctly reproduces the data for all the orifice sizes,
including the behaviors for very large and very small outlet