Boundary layer

Boundary layer ( English boundary layer ), the edge layer in a fluid , in which the wall exerts an influence.

One differentiates:

• the fluid dynamic boundary layer of a flowing fluid, the speed of which is influenced by the friction at a solid or fluid boundary surface,
• the thermal boundary layer of a fluid, the temperature of which is influenced by that of a solid or liquid boundary, and
• the concentration boundary layer , in which the concentration of a solid, liquid or gaseous body in a solution is influenced.

All three boundary layers can, but do not have to, occur simultaneously in a solid-fluid system; accordingly, they differ both geometrically and in their unsteady behavior.

literature

• Hermann Schlichting , Klaus Gersten: boundary layer theory . 10th edition. Springer, Berlin 2006, ISBN 978-3-540-23004-5 .

See also

• Boundary Layer Influence
• Atmospheric boundary layer

Web links

• Historical pictures - hydrodynamic boundary layer German Aerospace Center
• Boundary Layer NASA Glenn Research Center