Tuesday, January 28, 2020

fluid dynamics - How does this spray gun work?



This is the critter spray gun. enter image description here


The liquid in the jar is at atmospheric pressure (there's a vent hole connecting it to the atmosphere). A fast jet of air flowing right over the end of the pickup tube sucks the liquid up the tube and into the air stream. How exactly does this fast stream of air creates suction? It's released in the atmosphere, so shouldn't it also be at atmospheric pressure?


enter image description here




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