Boundary Layer
![Picture](/uploads/1/8/0/4/18044883/2416685.jpg?296)
A boundary layer is like a skin around a flying plane. It is a thin layer of fluid near the surface in which the velocity changes from zero, at the surface, to the free stream velocity, away from the surface. This is because as an object moves through a fluid, the flow is slower closer to the surface of the object because the molecules stick to it, due to the viscosity (or stickiness) of the fluid.
A boundary Layer can either be laminar or turbulent.
A boundary Layer can either be laminar or turbulent.