Boundary layer thickness is the distance from the boundary to the point where the velocity of the fluid is
Boundary layer thickness is the distance from the boundary to the point where the velocity of the fluid is Correct Answer equal to 99 percent of free stream velocity
Explanation:
Boundary-Layer Thickness:
It is defined as the distance from the boundary of the solid body measured in the perpendicular direction to the point where the velocity of the fluid is approximately equal to 0.99 times the free stream velocity (U). It s denoted by the symbol (δ).
Additional Information
Boundary layer:
When a real fluid flows past a solid body or a solid wall, the fluid particles adhere to the boundary and the condition of no-slip occurs i.e velocity of fluid will be the same as that of the boundary.
Farther away from the boundary, the velocity will be higher and as a result of this variation, the velocity gradient will exist.