If there is resistance at the outlet of the venturi, a vacuum cannot be created at the inlet. Why? ? ?
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A experiment was conducted using a venturi tube as an auxiliary inhaler. The diameter of the venturi tube was DN25, the inlet pressure was 0.5 Mpa, the medium at the inlet was water, and the medium to be drawn in was also water. When the outlet was fully open with no resistance, a vacuum of 0.02 Mpa could be created; however, once there was pressure at the outlet, water would spray out from the venturi inlet, and no vacuum could be generated. May I ask if the inlet pressure of the venturi is 1.6 Mpa and the outlet pressure is 0.4 Mpa, can a vacuum be created? How should it be explained? ? ? ?
The vacuum generated by a venturi is calculated based on the law of conservation of energy: u2/2g + p/g + z; it is sufficient to use two points for the calculation