Chimney Draw With Water

Purpose

To illustrate the concept of chimney draw due to the Bernoulli effect.

Equipment

Flask of colored water, plastic tube, compressed air source.

Suggestions

This is the principle of an atomizer, such as those which squirt a fine mist of perfume.

Setup Time

5 min.

Images

f5-10

Description

A plastic tube is inserted into a water reservoir, and a jet of air blown across the top of the tube. Water rises in the tube due to the reduced pressure in the moving air jet. Note that the cork in the picture is NOT sealed, so atmospheric pressure acts on the surface of the water in the beaker.◙

References

Julius Sumner Miller, On Demonstrating Bernoulli's Principle, AJP 22, 147-148 (1954).