A colleague recently proposed a question to me about the Venturi effect. He stated that fluids flow from high pressure to low pressure in a pipe, but if you have a pipe restriction (like a venturi tube), then since the fluid velocity is increased, the pressure drops. However, after the venturi tube ends and the pipe returns to original diameter, then the velocity decreases and pressure goes back up. He was wondering why the fluid appears to flow from a low pressure area to a high pressure area. I wasn't sure what a good technical explanation for this would be. Any help on the subject would be appreciated.
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