Laminar and Turbulent Flow
Laminar FLow
Laminar flow generally happens when dealing with small pipes and low flow speed. Laminar flow can be seen as a series of liquid cylinders in the pipe, where the deepest parts flow the fastest, and the cylinder touching the pipe isn't moving at all.
Ex. Fins of dolphins, blood through arteries, water in a tube, aircraft.
Turbulent Flow
In turbulent flow speed and eddies make the flow unpredictable. Turbulent flow happens in general at high flow rates and with larger pipes.
Ex. A block, golf ball, kite, running in a shallow pool
Laminar Flow
Dolphins decrease the frictional drag on their skin through the water to a much lower level than practiced by other bodies in water. This might be possible if the dolphins were able to maintain laminar flow as opposed to turbulent flow which would be at the speeds at which it travels. Laminar flow creates much less drag and so this explains for the dolphin's great speed.
Turbulent Flow
The dimples on the golf ball creates turbulence in the layer of air around the golf ball, called the Boundary Layer. The dimples scoop the air and lead it inwards toward the back of the golf ball. This increases the air pressure in the back of the ball, which decreases the drag by reducing the pressure pulling back at the ball from behind.
Laminar Flow
Laminar flow is flow that occurs along smooth parallel lines in a vessel so that all the red cells in an area are moving at around the same speed and in the same direction.
In the picture above, you can see that the Laminar Flow is a smooth looking flow that appears glassy when flowing out of the tap. All the water particles have the same direction. As for the Turbulent Flow, it is very opaque and not very clear. The water particles are travelling in different directions. If you are close to it, you can feel a spray of water. The particle reached you because it had a fast speed in your direction.