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Back to: "B"boundary layer
- Definição1
- The layer of fluid, close to the surface of a body placed in a moving stream, in which the impact pressure is reduced as a result of the viscosity of the fluid. A velocity gradient exists through the boundary layer, ranging from the velocity of the body to the velocity of the free airstream. The nature of the boundary layer determines the maximum lift coefficient, the stalling characteristics of a wing, the value of form drag, and to an extent the high-speed characteristics. In aerodynamics, the boundary-layer thickness is measured from the surface to an arbitrarily chosen point (e.g., where the velocity is 99% of the stream velocity). Thus, in aerodynamics, the boundary layer, by selection of the reference point, can include only the laminar boundary layer or the laminar boundary layer plus all, or a portion of, the turbulent boundary layer.
- Fonte1
- KUMAR, Bharat (ed.). An illustrated dictionary of aviation. New York: McGraw-Hill, c2005. 752 p.
- Fonte2
- ANTAS, Luiz Mendes. Dicionário de termos técnicos. 3. ed. São Paulo: Traço, 1980. 948 p. (Coleção Aeroespacial; t. 2.)
- Subárea
- Aerodynamics
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boundary layer.
Fonte: KUMAR, Bharat (ed.). An illustrated dictionary of aviation. New York: McGraw-Hill, c2005. 752 p.