Bernoulli's Principle & Fluid Flow Community
Questions, answers and tips from people who use the Bernoulli's Principle & Fluid Flow. Squeeze a pipe and watch the fluid speed up while the pressure gauge drops..
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This page shows only real posts from real people, so it starts empty. The guide below has the questions people most often have about the Bernoulli's Principle & Fluid Flow. Pick one to start a thread, or write your own.
From the tool guide: common questions about Bernoulli's Principle & Fluid Flow
The items below are not posts by community members. They come from the written guide for this tool and are here to get a conversation started. Use “Ask a follow-up” to open a thread about any of them.
What is the Venturi effect?
Fluid speeds up in a narrow section and its pressure falls.
From the tool guide Ask a follow-upDoes Bernoulli's principle explain aeroplane lift?
It is part of it; faster air over the wing means lower pressure, together with the wing deflecting air downwards.
From the tool guide Ask a follow-upKey ideas
- Continuity: A₁v₁ = A₂v₂, so a narrow pipe means faster flow.
- Bernoulli: faster fluid has lower pressure.
- Raising the outlet costs pressure (ρgh).
- The pressure drop grows with the square of the speed.
Things to try
- Squeeze the throat to 20% and read the pressure drop.
- Change to a denser fluid.
- Raise the outlet and see the pressure fall.
Where this is used
Carburettors, spray bottles, aeroplane wings, medical flow meters and chimney draughts all use Bernoulli's principle.
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