- #1

fysik

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In venturi meters, orifice plate meters and generally when there is a neck, constriction at a point in a pipe there is, at that point, a drop in pressure and an increase in velocity, so that the whole energy is preserved (theoretically)

my question is, why if we increase the flow rate (which means we increase the pressure in the pipe?) we have a much larger drop in pressure at the constriction?

that drop in pressure is larger, going through the same restricted hole, but why? what is the cause of this?

I could expected the drop in pressure to be the same, as the diameter of the hole is the same

but it seems that MORE energy becomes from pressure energy into kinetic energy with increased flow rate

but why?

thanks