a minimum
pressure to be released, i.e. the critical Laplace pressure, which is
higher than the pressure that is needed to sustain the oil flow
and continuous detachment of droplets, as soon as the oil flow
has started. If the supplied pressure across the membrane is lower
than the critical Laplace pressure, not all pores can be sustained,
and inactivation of pores occurs. Similar phenomena have been
seen with the formation of foams with membranes