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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.
Origin of boundary layer
1920-25 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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Examples from the web for boundary layer
  • In the unaltered or boundary layer, however, the glandular epithelium retains a columnar or cubical form.
  • Dimples on a golf ball create a thin turbulent boundary layer of air that clings to the ball's surface.
  • But as the flow rate decreases, the boundary layer re-attaches to the surface causing dribbling.
  • The boundary layer changes from laminar to turbulent at a transition point.
British Dictionary definitions for boundary layer

boundary layer

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
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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