Session 2: Illustrate turbulent flow using ink

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Objective: Get a better understanding and a better visualisation of flow

 Explanation:

The flow can be observed better in water.Using coloured ink the students will visualize the flow

Material:

a tank filled with water, ink, a little bottle and some forms: a ball, a cub and an airfoil.

Maximum duration:

20 minutes

Main questions to be answered

What do you think will happen with the ink?

Main activities

Fill the tank with cold water. Fill the bottle with hot water and ink. Take the bottle and place it inside the tank on the bottom of the tank. Observe what is happening with the coloured water in the bottle.  You can put different forms into the water above the bottle and observe how the flow will go around them.

Conclusion / Plenary

The first few centimetres the flow is laminar and then it turns into turbulent flow.