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  2. Skin friction drag - Wikipedia

    en.wikipedia.org/wiki/Skin_friction_drag

    Skin friction drag is a type of aerodynamic or hydrodynamic drag, which is resistant force exerted on an object moving in a fluid.Skin friction drag is caused by the viscosity of fluids and is developed from laminar drag to turbulent drag as a fluid moves on the surface of an object.

  3. Drag coefficient - Wikipedia

    en.wikipedia.org/wiki/Drag_coefficient

    The drag coefficient is always associated with a particular surface area. [3] The drag coefficient of any object comprises the effects of the two basic contributors to fluid dynamic drag: skin friction and form drag. The drag coefficient of a lifting airfoil or hydrofoil also includes the effects of lift-induced drag.

  4. Supercavitation - Wikipedia

    en.wikipedia.org/wiki/Supercavitation

    Supercavitation is the use of a cavitation bubble to reduce skin friction drag on a submerged object and enable high speeds. Applications include torpedoes and propellers , but in theory, the technique could be extended to an entire underwater vessel.

  5. Boundary layer control - Wikipedia

    en.wikipedia.org/wiki/Boundary_layer_control

    British zoologist Sir James Gray stated that dolphins appeared to have a turbulent boundary layer to reduce the likelihood of separation and minimize drag, and that mechanisms for maintaining a laminar boundary layer to reduce skin friction have not been demonstrated for dolphins.

  6. Toms effect - Wikipedia

    en.wikipedia.org/wiki/Toms_effect

    In fluid dynamics, the Toms effect is a reduction of the drag of a turbulent flow thought a pipeline when polymer solutions are added. [1]In 1948, B. A. Toms discovered [2] by experiments that the addition of a small amount of polymer into a Newtonian solvent (parts per million by weight), which results in a non-Newtonian fluid solution, can reduce the skin frictional drag on a stationary ...

  7. Parasitic drag - Wikipedia

    en.wikipedia.org/wiki/Parasitic_drag

    Skin friction drag imparts some momentum to a mass of air as it passes through it and that air applies a retarding force on the body. As with other components of parasitic drag, skin friction follows the drag equation and rises with the square of the velocity. Skin friction is caused by viscous drag in the boundary layer around the object. The ...

  8. Drag (physics) - Wikipedia

    en.wikipedia.org/wiki/Drag_(physics)

    Parasitic drag, or profile drag, is the sum of viscous pressure drag (form drag) and drag due to surface roughness (skin friction drag). Additionally, the presence of multiple bodies in relative proximity may incur so called interference drag, which is sometimes described as a component of parasitic drag. In aeronautics the parasitic drag and ...

  9. Aircraft fairing - Wikipedia

    en.wikipedia.org/wiki/Aircraft_fairing

    The wing root fairing of an American Aviation AA-1 Yankee. An aircraft fairing is a structure whose primary function is to produce a smooth outline and reduce drag. [1]These structures are covers for gaps and spaces between parts of an aircraft to reduce form drag and interference drag, and to improve appearance.