is there a theoretical formula to verify pressure drop
Dear everyone!
I used fluent to calculate the pressure drop inside a thin circular tube. My doubt is how the pressure drop is calculated? How do I know if the calculation is accurate and is there a theoretical formula to verify it?Thank you inadvance! gearman |
I would look to use the usual moody chart, see https://en.wikipedia.org/wiki/Moody_chart. It works
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just do the case with zero roughness.. It's the smooth pipe curve in the moody diagram
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There is no general rule for setting the roughness height. There isn't even a definition for what the roughness height even is. Roughness functions are developed by blatantly assuming that Nikuradse's law of the wall holds via circular logic. You find an equivalent roughness function by fitting the pressure drop and not the other way around. You can't predict the pressure drop unless you already know the roughness height and you can't know the roughness height unless you've measured the pressure drop.
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