💨 Venturi — faster flow through the throat means lower pressure

Incompressible flow obeys continuity A₁v₁ = A₂v₂, so the fluid must speed up through the narrow throat. Bernoulli then says the pressure must fall exactly where the speed rises — read it off the standpipe heights.

Walkthrough 1 / 3

Fluid enters the wide section at v₁ and flows to the right.

Inlet speed v₁ 1.5 m/s

Throat/inlet area ratio A₂/A₁ 0.40

A₁v₁ = A₂v₂ → v₂ = — m/s · P₁ + ½ρv₁² = P₂ + ½ρv₂² → ΔP = P₁−P₂ = — Pa
the throat is fast and low-pressure (the standpipe there is shortest)

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