You study flow over flat plate. Does flow over flat plate have any practical applications?

Understanding flow over plates have the following applications:

1) Design of ships and aircraft's in which boundary layer is formed around the body of the ship and aircraft.

2) Heat transfer in study of disposal of excess heat in radiator's.

3) Design of devices involving micro-fluidics.

4) Study of flow in magneto-hydrodynamics.

5) Design of devices in which boundary layer effects are significant.