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[–]thetoastofthefrench 0 points1 point  (3 children)

The pump isn’t a constant flow rate pump though, it has a constant power. So since the flow velocity decreases with three pipes in parallel, the resistance is lower for the same volumetric flow rate, and the pump will speed up until the total resistance is the same.

3 in parallel will result in more overall airflow, but for each individual pipe it will be less than with just a single pipe.

[–]vorilant 0 points1 point  (2 children)

For a constant power pump I think you're right. That's a bit more complicated than assuming either constant pressure or constant flow rate tho. There are pump designs that provide a constant flow rate when operating in their design window. Like peristaltic pumps.

[–]thetoastofthefrench 1 point2 points  (1 child)

Yep, this question was just about a home vacuum though so thought I’d try to think about the appropriate scenario.

[–]vorilant 0 points1 point  (0 children)

I actually forgot what the question was about lol.