Boundary Layer Theory

Boundary layer is a region in the immediate vicinity of the boundary surface in which the velocity of flowing fluid increases gradually increases gradually from zero at the boundary surface to the velocity of the main stream.

Development of Boundary Layer Region

Methods of Preventing Separation

• Rotating the boundary in the direction of flow
• Suction of the slow moving fluid by a suction slot
• Supplying additional energy from a blower
• Providing a bypass in the slotted wing
• Providing guide blades in a bend
• Injecting fluid into boundary layer
• Streamlining of body shapes