If You Doubled The Diameter Of A Pipe...

[sandyRoe]

... carrying fluids, how much more could it move?

[Peter Pedant]

2 to the power 4 - 16 times - Poiseuille's equation I think

[miser]

I thought it was four times as much

[Peter Pedant]

varies with r4, and so  2r  - oops that is doubling the radius

d is now 2d wh is 4r - raise to the power four  ( 256)

lots !.

 

[Canary42]

Cross section area is increased by 4 times miser, but it's more complex when dealing with fluid movement. PP seems to have the answer. 

[New Judge]

Four times as much.

Doubling the cross-sectional area of the pipe increases its area fourfold.

[Peter Pedant]

no woner the bogs in a lot of Courts of the realm dont work

[Prudie]

It could hold 4 times more but that's not the same as move, that would depend on the power behind the rate of flow.

[newmodarmy]

It's a cylinder for which volume is proportional to radius squared so I'd say 4 times too.

[Peter Pedant]

Hagen Pooiseuille - 

here

https://www.sciencedirect.com/topics/engineering/hagen-poiseuille-equation

not that well explained

Poiseuille was trying to model blood flow - and made various assumptions - such as Blood was a newtonian fluid. It isnt. Ironic it was . but works well in various conditions

The blood against a vascular wall is  devoid of blood cells. This makes the fluid far LESS viscous

[Peter Pedant]

for which volume is proportional to radius squared

yes for static fluids

the OP used the word 'move' - dynamic. Difft formula.

[Atheist]

Prudie's point is good. The flow rate would vary with the pressure applied. No pressure no flow - high pressure high flow.

What inspired the question?

[Atheist]

And viscosity?

[Peter Pedant]

high pressure high flow. ( actually the formula shows double the pressure difference, double the flow ( rate)

er yeah - but we were talking about radii = not pressure

[sandyRoe]

Atheist 

Something I saw on FB. 

It said when Bazelgette was designing the London sewers he decided to double their diameter, saying we can't know what the demand will be in the future.

[newmodarmy]

Force = pressure x area.

Sandy only mentioned changing the area( via the diameter).

So answer is still 2^2 =4

[douglas9401]

Engineers at the time said he was inexpert, just going through the motions.

[Peter Pedant]

Bazelgette was designing the London sewers

typical -  victorian over-engineering. but of course  you pay

Newton Heath down the Droyl ( Droylsden Rd) they were replacing the gas pipes. Old, looked like iron sewer down pipes, new looked like yellow plastic firbre optic jobbies.

The first lot ( gas to the Droyl) went in, in 1856.

[jackthehat]

The capacity is quadrupled but other factors will determine the actual flow.

[ToraToraTora]

18:41 I got dougie!

[ToraToraTora]

I got it!