Seeing the invisible
At the beginning of the 20th century, Ludwig Prandtl carried out experiments with a small channel of water in an attempt to make flow visible. At DLR_School_Lab Göttingen we'll experiment using what's now called a Prandtl water channel. With the help of this simple device the behaviour of water as it flows over and around various profiles can be investigated and we can record images of the flow with a digital camera.
The Prandtl circulating water channel
On profiles of aircraft wings and other models you can investigate the behaviour of water flow in a Prandtl channel. By putting aluminium flakes on the water surface you can make the flow images (eddies) visible. You'll find out what effect the shape of the model has on flow behaviour. With a digital camera you can record the flow images and discuss them in a team.