The Venturi Effect is the increase in a fluid's speed caused by constriction. Air is also considered a fluid. We commonly experience the Venturi Effect when we walk between two buildings located close to each other. The wind in the alley between the buildings will be stronger than what it is on either the front or back side. The back side of the building will create a low pressure area. Science projects can easily be created to demonstrate this effect and how the principle applies to our everyday lives.
Things You'll Need
- Wooden box
- Large stone
- Food coloring
- Rubber stopper with tube and second hole without a tube
Fill a small wooden box with sand. The sand should be level with the edges of the box. Place a small backstop behind the box to catch the sand. This backstop can be a wall or a foam poster board.
Place a large stone in the sand. Position the stone in the middle of the box. The largest face of the stone should be facing towards the front of the box.
Place a fan in front of the box. Turn the fan on, and watch what happens to the sand. The Venturi Effect will cause the wind from the fan to increase in speed as it hits the face of the stone. It will pick up the sand immediately in front of the stone and deposit the sand on the sides and back of the stone because the speed will immediately drop as the wind clears the sides and back of the stone.
Use the results of this experiment to demonstrate why some areas in the United States have restricted the building of tall skyscrapers next to beaches.
Fill a small glass beaker about halfway with water and food coloring.
Use a rubber stopper that is made for testing the Venturi Effect. The stopper will have a tube running through its middle. The stopper will also have another hole offset with no tubing placed in it.
Place the rubber stopper in the glass beaker. The tubing should reach the colored water.
Take a large syringe, and fill it with air. Position the syringe near the top edge of the exposed tubing on the side away from the hole with no tubing. Depress the plunger as quickly as you can.
Observe that as the air passes over the tube, water rises up and out of the tubing. This result is because on the opposite side of the tube a low pressure area is created allowing the colored water to rise up the tube. This principle is used for all commerical paint sprayers.
- Photo Credit airplane wings in the clouds image by Andrew Buckin from Fotolia.com
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