defination of laminar flow , turbulent flow and streamline flow with examples pls .

Streamline flow:/Laminar flow:

The flow of a fluid is said to be streamline if every particle of the fluid follows exactly the path of its preceding particle and has the same velocity as that of its preceding particle when crossing a fixed point of reference.Pipe intake and aerofoil are two good examples of streamline motion.

Laminar flow is a type of streamline flow in which a liquid flows over a fixed surface, the layer of molecules in the immediate contact of surface is stationary. The velocity of upper layers increases as the distance of layers from the fixed layer increases. In this flow liquid layers travel in parallel lines, without affecting the flow of each other. So the liquid flows in an orderly manner and thus has a smooth appearance. All layers need not travel with same velocities For example, when honey flows on a fixed surface, then the layer in immediate contact with the surface has the lowest velocity. As we move away from the surface, the velocity of subsequent layers increases. Hence the velocity of the outermost layer is the maximum, while the velocity of innermost layer in contact with the surface is the least. 

Turbulent flow:

It is described as an unsteady motion of the elements of the liquid along a zig-zag path. It is the opposite of Streamline Flow.

The flow of a fluid is said to be turbulent or disorderly, if its velocity is greater than its critical velocity. Critical velocity of a fluid is that velocity up to which the fluid flow is streamlined and above which its flow becomes turbulent. When the velocity of a fluid exceeds the critical velocity, the paths and velocities of the fluid particles begin to change continuously and haphazardly. The flow loses all its orderliness and is called turbulent flow.Examples of turbulent flow are blood flow in arteries,ocean currents.