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sbu
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Imagine a high cylindrical vessel (like a vertical pipe with bottom installed) of an OD = 10 inches and fluid inside that vessel (e.g. water). If we install pressure sensor on the wall of the vessel (inside the the vessel) near the bottom, it will read hydro-static pressure of the fluid column inside the vessel.
Now imagine that we will take the bottom of the vessel away, so that fluid will fall off freely, but we will keep filling the top of the vessel with fluid so that it will be constantly kept full, even though the fluid is just leaking out at the bottom. What will the pressure sensor read?
The versions that were brought up during discussion with my colleagues are:
- sensor will read zero pressure because the fluid is in free fall and hence it is a condition similar to the absence of gravity (so falling fluid will have no weight and hence no hydro-static pressure will be exerted on the sensor)
- sensor will read hydro-static pressure minus friction pressure loss between the fluid and the walls of a vessel
It will be interesting to hear your thoughts on this :)
Now imagine that we will take the bottom of the vessel away, so that fluid will fall off freely, but we will keep filling the top of the vessel with fluid so that it will be constantly kept full, even though the fluid is just leaking out at the bottom. What will the pressure sensor read?
The versions that were brought up during discussion with my colleagues are:
- sensor will read zero pressure because the fluid is in free fall and hence it is a condition similar to the absence of gravity (so falling fluid will have no weight and hence no hydro-static pressure will be exerted on the sensor)
- sensor will read hydro-static pressure minus friction pressure loss between the fluid and the walls of a vessel
It will be interesting to hear your thoughts on this :)