Fluid mechanics

Question 1

What is lamiar flow?

Answer 1

Lamiar flow is sooth air flow swicth the bondary layer clinging to the surface, with no disrution btween layers.

Question 2

How does laminar flow occur?

Answer 2

occurs at moderate speeds past objects of small diameter.

Question 3

Example of laminar flow?

Answer 3

Table tennis

Table tennis ball slowinf down and dropping to the ground - low speed → low turblance (laminar)

Question 4

Example of turbulent flow?

Answer 4

Tennis

A tennis ball - when contact off the racket at pace hight speed → high turbulence.

Question 5

What is Turbulemt flow?

Answer 5

Turbulent flow is ineven, choatic air movement with the bondary layers, eddies and swirls.

Question 6

How does turbulent flow occur?

Answer 6

Turbulent flow occurs because it has eddies - swirls and reverse currents that occur when liquid flows past an object.

(Learning to ‘peel in’ and ‘peel out’ of an eddie is an important skill.)

Question 7

What is a Vortex?

Answer 7

Vortex is formed when fluids are stirred. A vortex can be formed bothare and water. There can be seen behind a flight trail or a progectile. The shape of the ball effects the vortex.

Question 8

what is happening here?

Answer 8

• The turbulent flow moves over the roughend side of the ball
• outerswing - flight of the ball away from the better
• the ball will move towards its rough side with increadeed air pressure.