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• Boundary_layer abstract "In physics and fluid mechanics, a boundary layer is the layer of fluid in the immediate vicinity of a bounding surface where the effects of viscosity are significant. In the Earth's atmosphere, the atmospheric boundary layer is the air layer near the ground affected by diurnal heat, moisture or momentum transfer to or from the surface. On an aircraft wing the boundary layer is the part of the flow close to the wing, where viscous forces distort the surrounding non-viscous flow. See Reynolds number.Laminar boundary layers can be loosely classified according to their structure and the circumstances under which they are created. The thin shear layer which develops on an oscillating body is an example of a Stokes boundary layer, while the Blasius boundary layer refers to the well-known similarity solution near an attached flat plate held in an oncoming unidirectional flow. When a fluid rotates and viscous forces are balanced by the Coriolis effect (rather than convective inertia), an Ekman layer forms. In the theory of heat transfer, a thermal boundary layer occurs. A surface can have multiple types of boundary layer simultaneously.The viscous nature of airflow reduces the local velocities on a surface and is responsible for skin friction. The layer of air over the wing's surface that is slowed down or stopped by viscosity, is the boundary layer. There are two different types of boundary layer flow: laminar and turbulent.Laminar Boundary Layer FlowThe laminar boundary is a very smooth flow, while the turbulent boundary layer contains swirls or "eddies." The laminar flow creates less skin friction drag than the turbulent flow, but is less stable. Boundary layer flow over a wing surface begins as a smooth laminar flow. As the flow continues back from the leading edge, the laminar boundary layer increases in thickness.Turbulent Boundary Layer FlowAt some distance back from the leading edge, the smooth laminar flow breaks down and transitions to a turbulent flow. From a drag standpoint, it is advisable to have the transition from laminar to turbulent flow as far aft on the wing as possible, or have a large amount of the wing surface within the laminar portion of the boundary layer. The low energy laminar flow, however, tends to break down more suddenly than the turbulent layer.".
• Boundary_layer thumbnail Boundarylayer.png?width=300.
• Boundary_layer wikiPageExternalLink prandtl_vol58no12p42_48.pdf.
• Boundary_layer wikiPageExternalLink npde-toc5.pdf.
• Boundary_layer wikiPageExternalLink naca-report-1124.
• Boundary_layer wikiPageExternalLink boundlay.html.
• Boundary_layer wikiPageExternalLink blsep.html.
• Boundary_layer wikiPageExternalLink boundary_layer.
• Boundary_layer wikiPageExternalLink 596.
• Boundary_layer wikiPageExternalLink TB_16January2013.pdf.
• Boundary_layer wikiPageID "224301".
• Boundary_layer wikiPageLength "34845".
• Boundary_layer wikiPageOutDegree "105".
• Boundary_layer wikiPageRevisionID "674636996".
• Boundary_layer wikiPageWikiLink A_priori_and_a_posteriori.
• Boundary_layer wikiPageWikiLink Adverse_pressure_gradient.
• Boundary_layer wikiPageWikiLink Aerodynamics.
• Boundary_layer wikiPageWikiLink Aircraft.
• Boundary_layer wikiPageWikiLink Airfoil.
• Boundary_layer wikiPageWikiLink André_Lévêque.
• Boundary_layer wikiPageWikiLink Atmosphere_of_Earth.
• Boundary_layer wikiPageWikiLink Atmospheric_boundary_layer.
• Boundary_layer wikiPageWikiLink Bernoullis_equation.
• Boundary_layer wikiPageWikiLink Bernoullis_principle.
• Boundary_layer wikiPageWikiLink Blasius_boundary_layer.
• Boundary_layer wikiPageWikiLink Boundary-layer_thickness.
• Boundary_layer wikiPageWikiLink Boundary_(thermodynamic).
• Boundary_layer wikiPageWikiLink Boundary_layer_control.
• Boundary_layer wikiPageWikiLink Boundary_layer_separation.
• Boundary_layer wikiPageWikiLink Boundary_layer_suction.
• Boundary_layer wikiPageWikiLink Boundary_layer_thickness.
• Boundary_layer wikiPageWikiLink Boundary_layer_transition.
• Boundary_layer wikiPageWikiLink Cartesian_coordinate_system.
• Boundary_layer wikiPageWikiLink Cartesian_coordinates.
• Boundary_layer wikiPageWikiLink Category:Aircraft_wing_design.
• Boundary_layer wikiPageWikiLink Category:Boundary_layers.
• Boundary_layer wikiPageWikiLink Category:Heat_transfer.
• Boundary_layer wikiPageWikiLink Characteristic_polynomial.
• Boundary_layer wikiPageWikiLink Coandă_effect.
• Boundary_layer wikiPageWikiLink Conduction_(heat).
• Boundary_layer wikiPageWikiLink Convective_heat_transfer.
• Boundary_layer wikiPageWikiLink Coriolis_effect.
• Boundary_layer wikiPageWikiLink Displacement_thickness.
• Boundary_layer wikiPageWikiLink Drag_(physics).
• Boundary_layer wikiPageWikiLink Earths_atmosphere.
• Boundary_layer wikiPageWikiLink Ekman_layer.
• Boundary_layer wikiPageWikiLink Facility_for_Airborne_Atmospheric_Measurements.
• Boundary_layer wikiPageWikiLink Flow_separation.
• Boundary_layer wikiPageWikiLink Fluid.
• Boundary_layer wikiPageWikiLink Fluid_mechanics.
• Boundary_layer wikiPageWikiLink Force.
• Boundary_layer wikiPageWikiLink Fuselage.
• Boundary_layer wikiPageWikiLink Gamma_function.
• Boundary_layer wikiPageWikiLink Glider_(aircraft).
• Boundary_layer wikiPageWikiLink Glider_aircraft.
• Boundary_layer wikiPageWikiLink Heat_transfer.
• Boundary_layer wikiPageWikiLink Heidelberg.
• Boundary_layer wikiPageWikiLink Heidelberg,_Germany.
• Boundary_layer wikiPageWikiLink Hendrik_Tennekes.
• Boundary_layer wikiPageWikiLink Hermann_Schlichting.
• Boundary_layer wikiPageWikiLink Incompressible_flow.
• Boundary_layer wikiPageWikiLink International_Congress_of_Mathematicians.
• Boundary_layer wikiPageWikiLink John_L._Lumley.
• Boundary_layer wikiPageWikiLink Kinematic_viscosity.
• Boundary_layer wikiPageWikiLink Laminar-turbulent_transition.
• Boundary_layer wikiPageWikiLink Laminar_flow.
• Boundary_layer wikiPageWikiLink Law_of_the_wall.
• Boundary_layer wikiPageWikiLink Logarithmic_law_of_the_wall.
• Boundary_layer wikiPageWikiLink Ludwig_Prandtl.
• Boundary_layer wikiPageWikiLink Mean.
• Boundary_layer wikiPageWikiLink Natural_laminar_flow.
• Boundary_layer wikiPageWikiLink Navier–Stokes_equations.
• Boundary_layer wikiPageWikiLink Nikola_Tesla.
• Boundary_layer wikiPageWikiLink No-slip_condition.
• Boundary_layer wikiPageWikiLink Order_of_magnitude_analysis.
• Boundary_layer wikiPageWikiLink Parasitic_drag.
• Boundary_layer wikiPageWikiLink Partial_differential_equation.
• Boundary_layer wikiPageWikiLink Peniche_(fluid_dynamics).
• Boundary_layer wikiPageWikiLink Physics.
• Boundary_layer wikiPageWikiLink Planetary_boundary_layer.
• Boundary_layer wikiPageWikiLink Porosity.
• Boundary_layer wikiPageWikiLink Porous.
• Boundary_layer wikiPageWikiLink Prandtl_number.
• Boundary_layer wikiPageWikiLink Pressure_drag.
• Boundary_layer wikiPageWikiLink Reynolds_decomposition.
• Boundary_layer wikiPageWikiLink Reynolds_number.
• Boundary_layer wikiPageWikiLink Scale_analysis_(mathematics).
• Boundary_layer wikiPageWikiLink Shape_factor_(boundary_layer_flow).
• Boundary_layer wikiPageWikiLink Shear_stress.
• Boundary_layer wikiPageWikiLink Shear_velocity.
• Boundary_layer wikiPageWikiLink Similitude_(model).
• Boundary_layer wikiPageWikiLink Simple_shear.
• Boundary_layer wikiPageWikiLink Skin_friction.
• Boundary_layer wikiPageWikiLink Stokes_boundary_layer.
• Boundary_layer wikiPageWikiLink Stream_function.
• Boundary_layer wikiPageWikiLink Tesla_turbine.
• Boundary_layer wikiPageWikiLink Thermal_conduction.
• Boundary_layer wikiPageWikiLink Thermodynamic_system.
• Boundary_layer wikiPageWikiLink Turbine.
• Boundary_layer wikiPageWikiLink Turbulator.

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