Objective:
– To show pressure differential along a tube of changing diameter. Illustrates the presence of higher pressure on either side of a constriction.
Apparatus:
- Venturi tube mounted horizontally with an end rubber stopper
- 4 manometers with rubber stoppers
- Air supply (vacuum cleaner, or lab air supply)
- Special hose attachment(s)
Method:
The relative pressures are indicated by a four tube manometer filled with colored water and attached to the Venturi tube. When airflow is present, the water in the constriction area assumes a lower level than the outside tubes because of the lower pressure caused by high speed flow velocity in the area.
Note:
All the stoppers need to be removed before turning on the blower (4 on the manometers and 1 on the end of the tube).
Bernoulli’s Principle, Venturi
– Video Created at Utah State University by Professor Boyd F. Edwards and assistants.