Calculation of gravity flow discharge height under negative pressure
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Calculation of the discharge height for gravity flow under negative pressure: When the tank is under negative pressure, how can one determine the required height difference to discharge the material? Are there any books or materials available?
For the Bernoulli equation to hold, a minimum condition must be met: the hydrostatic pressure of the liquid (derived from the liquid’s density and height) must be greater than the difference between atmospheric pressure and the pressure inside the tank. Next, consider the required flow rate, viscosity, etc
If emptied directly, it’s 10 meters; if discharged into a container, it’s 10 meters plus the pressure of the collection container.
Tank top pressure + height difference = friction loss in the pipeline + back pressure