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Joseph Gwinn

On May 28, 2017, wrote
(in ):

huge snip

I know how a centrifugal pump works. That video doesn't address the issue in
question: What happens when the input pressure is higher than the example in
your video? And how does it work?

Notice that you did not address the issue of the involute volume increasing
as the liquid flows from the center to the periphery, and the effect that has
on pressure.

I think that the missing piece is Bernoullis Equation:

..http://hyperphysics.phy-astr.gsu.edu/hbase/pber.html
..https://en.wikipedia.org/wiki/Bernoulli%27s_principle

For water (and air at low velocity compared to the speed of sound), read the
stuff about incompressible flow.

Joe Gwinn