When air flows through a venturi it speeds up, why does it do that? In simplest terms, pressure energy is converted to kinetic energy. In more accurate terms, there is a lot going on, and pressure itself while being the prime mover, is only part of the equation. Part of the reason a venturi even works, is because there is imperfect pressure recovery, due to entropic losses, thus the outlet is always at slightly lower pressure than the inlet. High pressure always flows to low, thus the venturi outlet acts as a favorable pressure gradient for air to follow.
If the pressure in the outlet is lower than the pressure at the inlet, the flow will follow the path of least resistance and naturally seek the outlet.
When you use a shop air hose, the pressure in the hose is much higher than atmospheric, the pressurized air expands into ambient. Now, if you lower the pressure of the ambient air at the discharge point, the air that comes out of the air hose rushes out with even more force, because there is less ambient air pressure acting as a restriction.
This is the principle behind air amplifiers.
https://www.youtube.com/watch?v=6HeagI8Tkh0Therefore, the effectiveness of a venturi lies not just on the inlet pressure, but the outlet pressure as well.
The taoist principle of yin/yang separation generates power is highlighted here, the higher the separation of high and low pressure, the faster the air moves.
And to add weirdness, if you separate a positive and a negative electrical charge with a non-conductive material, at a certain current and voltage you begin ionizing the air around the charge separation. The so called dielectric barrier discharge, which can be used to influence airflow.
https://www.youtube.com/watch?v=HU0WPt9rKaI
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