Sunday 17 July 2016

fluid dynamics - How does a Venturi Injector comply with energy conservation?


How does a Venturi Injector comply with energy conservation?


Venturi Injector



When the water flow enters the narrower cross section its velocity increases and its pressure decreases. When the pressure gets lower than ambient atmospheric pressure the atmosphere is pushing air or liquid through the injection tube into the main line.


The particles in the injection tube get accelerated. Following conservation of energy, where does the kinetic energy come from? Please notice that I am not asking whether the kinetic energy of the flow at the exit is equal to the entry (it is not because of inelastic losses in the mixing process), but: when a fluid is pushed or sucked in from the side, where does the energy come from to accelerate it?




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