Vacuum pump suction height
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I would like to ask my friends: with a vacuum pump that achieves a vacuum level of -0.09 Mpa, to what height can water be pumped?
H=90000/ρ/9.81≈9.19m
Theoretically 9 meters tall, actual height unknown
It should actually be a bit lower, due to the friction losses along the pipes
Indeed, considering the pipe resistance, it should be around 9 meters
This post was last edited by symc on 2018-8-29 at 15:32 :funk: Can pipe resistance be generated without flow? ……The elevation increase is different from the height to which flow occurs, right? The actual height is low because the partial pressure of the medium needs to be taken into account... but the formula above does not take this partial pressure into consideration!
Is there anyone with expertise in this craft? Give an explanation.
Firstly, it is related to the elbow and the condition of the inner wall of the pipe; the fluid itself represents the resistance. Secondly, it is related to the local atmospheric pressure. But for estimation, it can be considered as a height of 9 meters * 80% = 7.2 meters