PHYSICAClass 11 Physics simulations · Mechanical Properties of Fluids
Venturimeter
Water speeds up through a narrow throat and its pressure drops — read the drop on the vertical tubes.
What to notice
Fluid moves fastest where the pipe is narrowest, and the pressure there is lowest.
Key relation
A₁v₁ = A₂v₂ ; P₁ − P₂ = ½ρ(v₂² − v₁²)
Try this
Halve the throat diameter. By what factor does the speed rise?
What you can change
- Flow rate: 0.5 to 10 L/s
- Main pipe diameter: 4 to 10 cm
- Throat diameter: 1.5 to 4 cm
More in Mechanical Properties of Fluids
- Lift on an aerofoil
- Float or sink?
- Capillary rise and depression
- Flow through a narrowing pipe
- Pressure inside drops and bubbles
- Hydraulic lift (Pascal)
- Pressure at depth in a tank
- Viscous drag and terminal speed
- Water jet from a tank
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