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Atouk
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- TL;DR Summary
- Necessary conditions for Bernoulli's theorem.
Can Bernoulli's equation be applied between points 1 and 2, ignoring the another tank ?
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What do you think?Summary:: Necessary conditions for Bernoulli's theorem
https://www.physicsforums.com/attachments/263163
Can Bernoulli's equation be applied between points 1 and 2, ignoring the another tank ?
I would say "of course not", but I can not explain what happens with the steamline between 1 and 2...What do you think?
I see, but supposing that I have all the information about the points 1 and 2All the water would flow from the upper reservoir to the lower reservoir on the right. There would be no flow from 2 to 1 unless a huge flow were forced by the pump. It would have to provide a pressure of at least 10 psi.
I think that if you specify the flow at the pump, you can determine the pressure at the pump and the flows in the two arms using Bernoulli.I see, but supposing that I have all the information about the points 1 and 2
(speed, pressure and height), could I be able to apply Bernoulli's equation and figure out Hp?
My question is conceptual, the values don't matter.
So, in an ideal situation (steady flow, without losses in pipes, etc.)I think that if you specify the flow at the pump, you can determine the pressure at the pump and the flows in the two arms using Bernoulli.
To get your feet wet, start out by considering the problem where there is no flow from the pump.So, in an ideal situation (steady flow, without losses in pipes, etc.)
p1 / ρ + (v1^2) / 2 + g*h1 = p2 / ρ + (v2^2) / 2 + g*h2 - Hp ?
Where on Earth are you getting 10 psi from here?All the water would flow from the upper reservoir to the lower reservoir on the right. There would be no flow from 2 to 1 unless a huge flow were forced by the pump. It would have to provide a pressure of at least 10 psi.
Summary:: Necessary conditions for Bernoulli's theorem.
View attachment 263167
Can Bernoulli's equation be applied between points 1 and 2, ignoring the another tank ?
If I remember correctly, the OP showed some dimensions on his original post (which was later edited).Where on Earth are you getting 10 psi from here?
After further consideration of this situation, I totally agree.In general, this does not look like a situation where Bernoulli would apply because based on the diagram alone, I strongly suspect that there are significant viscous losses here, especially given that 2 is labeled as a river with what appears to be a free surface well below the surface of 1. Bernoulli applies to situations without significant viscous loss, and I don't see how that can be the case here.
Ah, that would explain it. I first saw it with no dimensions, so your claim seemed totally arbitrary.If I remember correctly, the OP showed some dimensions on his original post (which was later edited).