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The
principle of operation of most separators is the gravity differential
between
oil and water.
The motive
force acting on a sphere of oil, moving in water, is related to
the
difference in mass between the oil particle and a water particle of equal
volume.
The
resistance to the movement of the oil particle is theoretically
determined
by either:-
Stoke's
Law For small particles moving under
Streamline conditions.
Newton's
Law For larger particles moving under
Turbulent conditions.
The change
between Newton's to Stokes's law is not precisely defined and
in design
practice an intermediate law is assumed.
The
velocity of separation under Stokes's Law is too slow for effective
gravity
separation and means of coalescing small particles is required in
all
commercial separators.
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