Does the medium flow from top to bottom, like in full-pipe river flow?
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In a vertical pipe, with the fluid flowing from top to bottom, like in a river, how can it be ensured that the fluid fills the entire pipe? (Discuss the two cases of pumping and gravity flow – is there any difference?) ) I would like to ask the experts.
Can full pipe filling be ensured by changing the diameter? The speed must change due to gravity as it flows downward
For backflow restriction, the key is to maintain pressure and prevent the medium from vaporizing.
In the case of gravity flow, backflow restriction should be possible, just like with the IV tubes we use in humans.
Could you please explain in more detail? Why is throttling possible in the latter stage? And how should one calculate the length of the pipe when it is filled as the liquid flows downward?
I don’t quite understand. Could you please explain it in detail? In a vertical pipe as I imagine it, when flow occurs by gravity, the flow velocity increases while the flow rate remains constant; as a result, the cross-sectional area through which the fluid flows must decrease. Eventually, the fluid may only be present in the middle of the pipe, with no fluid at the walls. But how should the initial full pipe length be calculated?
Make an air release port at a high position; during the first operation, release all the gas, then close the valve to maintain a full-liquid circulation
It is sufficient to ensure that the pressure at the lower end of the pipe, after taking into account the friction losses, is greater than the pressure at the lower part.