GP Vaguely proud of myself today that I knew that pipe diameter increase increases flow in (I hope I say this mathematically correctly) a non-linear, more-geometric fashion. Basically, doubling the pipe diameter waaaaaaay more than doubles the potential volume throughput.
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Replying to @Gormogons
to a good approximation flow is correlated with pipe cross sectional AREA, which goes up with the SQUARE of radius (A = pi r ^2). it's slightly more complicated than that bc there's skin effect drag near the boundary, and C goes up linearly with r
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Replying to @MorlockP @Gormogons
Yep, because drag would be a result of increased surface area due to crud inside the pipe (more SA, more drag) which reduces the flow you're increasing w/ incr. r. Also consider the viscosity of the fluid moving through the pipe, and you've got lots of fun food for thought!
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Replying to @ConfiteorDeo @Gormogons
not just crud, but the surface itself, even if perfectly cleanhttps://en.wikipedia.org/wiki/Skin_friction_drag …
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to a good approximation, two adjacent molecules can't move at different speeds. So if the tube wall is not moving, the water molecules up tight against it can only move very slowly. The molecules up against those (slightly closer to center) move a bit faster, but not much >>>
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