- boundary layer
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 in contact with a surface (e.g., of an airplane wing or the inside of a pipe).The fluid in the boundary layer is subjected to shear forces. A range of velocities is established across the boundary layer, from zero (provided the fluid is in contact with the surface) to maximum. Flow in boundary layers is more easily described mathematically than is flow in the free stream. Boundary layers are thinner at the leading edge of an aircraft wing and thicker toward the trailing edge; such boundary layers generally have laminar flow in the leading (upstream) portion and turbulent flow in the trailing (downstream) portion. See also drag.
* * *in fluid mechanics, thin layer of a flowing gas or liquid in contact with a surface such as that of an airplane wing or of the inside of a pipe. The fluid in the boundary layer is subjected to shearing forces. A range of velocities exists across the boundary layer from maximum to zero, provided the fluid is in contact with the surface. Boundary layers are thinner at the leading edge of an aircraft wing and thicker toward the trailing edge. The flow in such boundary layers is generally laminar (laminar flow) at the leading or upstream portion and turbulent (turbulent flow) in the trailing or downstream portion. See also laminar flow; turbulent flow.
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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.
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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… … Aviation dictionary
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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