Does a Thicker Pipe Increase Pressure?

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    Pipe Pressure
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Discussion Overview

The discussion revolves around the relationship between pipe thickness and pressure, specifically whether a thicker pipe results in higher pressure compared to a thinner pipe when both have the same mass flow rate. The scope includes theoretical considerations and applications of fluid dynamics principles.

Discussion Character

  • Debate/contested

Main Points Raised

  • One participant questions the assumption that a thicker pipe would have higher pressure than a thinner pipe, suggesting that the thinner pipe might actually exhibit higher pressure.
  • Another participant references Bernoulli's principle to argue that if a thicker pipe has a larger outer radius but a smaller inner radius, it would lead to greater pressure due to the velocity changes in the fluid.
  • A clarification is made regarding terminology, specifying that "thicker" refers to a larger inner diameter rather than outer dimensions.
  • One participant asserts that there is no fixed relationship between pressure and flow, indicating that a pressure difference can exist between pipes of different thicknesses when the same fluid flows through them, and explains that the thicker pipe has lower resistance to flow, resulting in a lower pressure drop per length.

Areas of Agreement / Disagreement

Participants express differing views on the relationship between pipe thickness and pressure, with no consensus reached on whether a thicker pipe inherently results in higher pressure.

Contextual Notes

Participants rely on fluid dynamics principles, but there are unresolved assumptions regarding the definitions of "thicker" and "thinner" pipes, as well as the specific conditions under which pressure is measured.

eddiej90
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Can someone explain to me why a thicker pipe would have a higher pressure than that of a thinner pipe with the same mass flow rate?

Surely the thinner pipe would have a higher pressure?
 
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What do you mean by a "thicker pipe"? If pipe "B" has the same outer radius as pipe "A", but thicker, then it will have smaller inner radius and, by Bernoulli's principle (voko's link), have greater pressure. Of course, if a thicker pipe will withstand a greater pressure before bursting.
 
Sorry, my bad terminology letting me down there. One pipe has a larger inner diameter than the other.

Thanks
 
There is no fixed relation between pressure and flow. If you combine both and let the same stuff flow through both pipes, you can see a pressure difference.

Think of it like this, with a flow thick pipe -> thin pipe: The material has to increase its velocity at the boundary (as you have the same flow in both pipes). This requires an overpressure in the thick pipe. In the reversed flow direction, the material does slow down, this corresponds to a higher pressure in the thick pipe, too.What you probably mean is the pressure drop per length in the pipes: This is lower in the thicker pipe, as the resistance to flow is lower there.
 

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