# 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 ?
Merkin, "Unsteady mixed convection boundary-layer flow with suction and temperature slip effects near the stagnation point on a vertical permeable surface embedded in a porous medium," Transport in Porous Media, vol.
Khaki, Comparative Analysis of MHD Boundary-Layer Flow of Viscoelastic Fluid in Permeable Channel with Slip Boundaries by using HAM, VIM, HPM, Walailak Journal of Science and Technology (WJST), in press.
The boundary-layer equations governing the flow and heat transfer of a non-Newtonian power-law fluids past a wedge are given by
With these processes in mind, it's easier to understand why design changes that either (a) increase the rate of heat transfer from the middle of the glass to the surface, (b) decrease the amount of heat stored within the glass, or (c) increase the rate of heat transfer from the glass surface to the surrounding air will decrease [DELTA]T, and thus the boundary-layer strength.
Richard Eppler program system PROFIL combines a conformal-mapping method for the design of airfoils with prescribed velocity distribution characteristics, a panel method for the analysis of the potential flow about given airfoils, and an integral boundary-layer method.
The boundary-layer problem is long-lasting because telescope mirrors have an unfortunate combination of properties --they store heat well and have poor thermal conductivity.
So aircraft designers reduce drag, without compromising lift, by precisely placing a few small bumps or dips, called boundary-layer trips, on wings and blades.
Capability: The developer has made Java computer codes available via the Internet to help solve boundary-layer problems or boundary-layer convection problems.
Yazbak explains that information provided by flush-mounted thermocouples near equipment walls doesn't really represent the temperature of the rest of the melt steam due to boundary-layer flow effects and the fact that polymers are poor thermal conductors.
for the Advancement of Boundary-Layer Remote Sensing, Boulder, CO, NOAA-CIRES, 302-305.

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