Bernoulli: Venturi, Aerofoil, Magnus

Also called

Bernoulli's principle · Bernoulli's equation · Venturi meter · Venturi tube · equation of continuity · streamline flow · aerofoil · dynamic lift · Magnus effect · spinning ball swerves · blowing over paper · roof blown off in a storm · pressure and speed of a fluid · fluid dynamics · manometer · बरनौली का सिद्धांत · धारारेखी प्रवाह · वेंटुरीमीटर

Topics

• Equation of continuity: for an incompressible fluid A₁v₁ = A₂v₂, so the flow speeds up where the tube narrows.
• Bernoulli’s principle: P + ½ρv² + ρgh is constant along a streamline, so faster flow means lower pressure.
• In a Venturi meter the manometer column above the narrow throat stands lowest: fast flow, low pressure.
• Air over the curved top of an aerofoil travels faster than air below, so the pressure above is lower: dynamic lift.
• A spinning ball drags air round with it; the air is faster on one side, so a pressure difference curves its path.
• Blowing over the top of a strip of paper lowers the pressure there, and the still air beneath pushes the strip up.
• In a storm the fast wind over a roof lowers the pressure above it; the still air inside pushes the roof up.
• Bernoulli’s equation is a statement of energy conservation per unit volume for steady, non-viscous, streamline flow.

About this model

A GLB file of about 447 KB, shown in Lably's 3D viewer and, on a phone, placed in your room with AR. Credit: Model, science and animation: Lably (built procedurally with three.js; no downloaded meshes). | CC BY 4.0. Original geometry and animation made for Lably.

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