boundary layer

noun

Meaning

A thin layer of fluid (such as air or water) close to a solid surface where the fluid's velocity changes due to friction, significantly affecting flow behavior.

Examples

  • The aerodynamic drag on an airplane wing is largely determined by the properties of its boundary layer.
  • Understanding the boundary layer is crucial in designing efficient pipelines for oil and gas.

Synonyms: fluid film, viscous layer, shear layer