boundary layer

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.

Aviation dictionary. 2014.

Look at other dictionaries:

  • boundary layer — n. a very thin layer of fluid immediately next to a solid body, that flows more slowly than the rest of the fluid …   English World dictionary

  • Boundary Layer —  Boundary Layer  Граничный слой (поверхностный слой, пограничный слой, кристаллизационный дворик)   Неоднородный тонкий слой определенной толщины и объема, который располагается по обе стороны поверхности, разделяющей две соприкасающиеся объемные …   Толковый англо-русский словарь по нанотехнологии. - М.

  • Boundary layer — For the anatomical structure, see Boundary layer of uterus. Boundary layer visualization, showing transition from laminar to turbulent condition In physics and fluid mechanics, a boundary layer is that layer of fluid in the immediate vicinity of… …   Wikipedia

  • boundary layer — Physics. the portion of a fluid flowing past a body that is in the immediate vicinity of the body and that has a reduced flow due to the forces of adhesion and viscosity. [1920 25] * * * In fluid mechanics, a thin layer of flowing gas or liquid… …   Universalium

  • boundary layer — paribio sluoksnis statusas T sritis radioelektronika atitikmenys: angl. boundary layer vok. Grenzschicht, f rus. пограничный слой, m pranc. couche interfaciale, f …   Radioelektronikos terminų žodynas

  • boundary layer — ribinis sluoksnis statusas T sritis fizika atitikmenys: angl. boundary layer vok. Grenzschicht, f; Randschicht, f rus. граничный слой, m pranc. couche limite, f …   Fizikos terminų žodynas

  • boundary layer — noun a layer of stationary fluid (such as water or air) surrounding an immersed moving object …   English new terms dictionary

  • boundary layer — /ˈbaʊndri leɪə/ (say bowndree layuh) noun Aeronautics, Physics, etc. the thin layer of fluid next to the surface of a moving body in which there is a transition between the velocity of the body on one side, and the velocity of the fluid on the… …   Australian English dictionary

  • boundary layer — noun the layer of slower flow of a fluid past a surface • Hypernyms: ↑physical phenomenon …   Useful english dictionary

  • boundary layer — noun Date: 1921 a region of retarded fluid near the surface of a body which moves through a fluid or past which a fluid moves …   New Collegiate Dictionary

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