# boundary layer

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Related to boundary layer: Atmospheric boundary layer

## boundary layer

In fluidics, a narrow region next to a fixed boundary or surface where the fluid velocity rapidly changes from zero to some finite value.

## boundary layer

microscopic layer of fluid (liquid or gas) next to the surface of a body or object moving relative to it, important in considering the drag force upon the object. laminar boundary layer layer which is next to the surface of an object, not mixing with the flow further away from the surface, and so can be considered to be a discrete layer in a plane parallel to the main flow. turbulent boundary layer layer which is next to the surface of an object, but in this case mixing with the flow further away from it. An example of a boundary layer change is that due to a dimpled golf ball in flight: the dimples make the boundary layer turbulent, which reduces drag caused by the pressure being lower behind the ball, so less energy is lost to the flow.
References in periodicals archive ?
MHD boundary layer flow and heat transfer over an exponentially stretching sheet embedded in a thermally stratified medium, Alex.
In the region above the backflow, the smoke adheres to the left wall surface, namely the boundary layer attachment or the Coanda effect (Zhuang et al.
The reason is that when [phi] = 0 the nanofluid boundary layer flow problem reduces to the regular fluid boundary layer problem, and thus the nanoparticle type does not alter the values of skin friction coefficient.
The governing boundary layer equations are solved using quasilinearization technique.
Acceleration or deceleration in the flow that moves around the cylinder causes significant change to the structure of the boundary layer and, correspondingly, change to the position of the point of boundary layer separation: during acceleration of the flow around the cylinder ([partial derivative]W/[partial derivative][tau]) > 0, the point of separation shifts backwards, causing a decrease in aerodynamic trail width and as a result profile drag caused by viscous forces in the flow (the coefficient of profile drag [C.
Aubertine and Eaton (2006) carried out Laser Doppler Anemometry studies in a turbulent boundary layer with a mild adverse pressure gradient.
At high Reynolds number values, the heat resistance may be reduced by means of turbulence with the streaming medium disrupting the boundary layer also near the wall.
Flow field analysis of a turbulent boundary layer over a riblet surface.
The ground-based nature of potential Army HEL engagements will be strongly affected by the required long, oblique slant paths through the dense atmospheric boundary layer.
It was observed, that in general 3 regions namely a wake region, central core and a boundary layer region are present.
In similar way, other kinds of viscous boundary layer have been studied so as to connect geostrophic flows to vertical boundaries (for exampled a vertical well along which the depth varies) on which boundary conditions in consistent with geostrophic flow are given.

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