gravity, pressure and viscous
gravity, pressure and turbulent
pressure, viscous and turbulent
gravity, viscous and turbulent
smooth and streamline flow
laminar flow
steady flow
highly turbulent flow.
less than 2000
between 2000 and 4000
more than 4000
less than 4000
frictional force
viscosity
surface friction
all of these
minimum
maximum
zero
could be any value.