BOUNDARY LAYER Definition & Meaning

boundary layer

noun

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.

boundary layer

noun

the layer of fluid closest to the surface of a solid past which the fluid flows: it has a lower rate of flow than the bulk of the fluid because of its adhesion to the solid

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51�Թ� History and Origins

Origin of boundary layer¹

First recorded in 1920–25

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Example Sentences

Examples have not been reviewed.

"The particles adopt a certain orientation very early on, i.e. in the boundary layer between the water and the sediment. This alignment increases further within the first few millimetres of sediment," explains Kühn.

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In atmospheric science, the boundary layer of the atmosphere is the region closest to the Earth's surface.

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"The structure they are researching, which engineers call the atmospheric boundary layer, monitors how the wind's speed, temperature and pressure varies with altitude."

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If you are standing still, out of the wind, your body’s natural heat will warm the air in the space around you — your “personal boundary layer” — by a small amount, Ms. Hasell said.

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That day, northerly cyclonic winds swept warm, dry air over a cool, moist boundary layer on the Black Sea.

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