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- Drag_equation abstract "In fluid dynamics, the drag equation is a formula used to calculate the force of drag experienced by an object due to movement through a fully enclosing fluid. The formula is accurate only under certain conditions: the objects must have a blunt form factor and the fluid must have a large enough Reynolds number to produce turbulence behind the object. The equation iswhereFD is the drag force, which is by definition the force component in the direction of the flow velocity,ρ is the mass density of the fluid, v is the velocity of the object relative to the fluid,A is the reference area, andCD is the drag coefficient – a dimensionless coefficient related to the object's geometry and taking into account both skin friction and form drag.The equation is attributed to Lord Rayleigh, who originally used L2 in place of A (with L being some linear dimension).The reference area A is typically defined as the area of the orthographic projection of the object on a plane perpendicular to the direction of motion. For non-hollow objects with simple shape, such as a sphere, this is exactly the same as a cross sectional area. For other objects (for instance, a rolling tube or the body of a cyclist), A may be significantly larger than the area of any cross section along any plane perpendicular to the direction of motion. Airfoils use the square of the chord length as the reference area; since airfoil chords are usually defined with a length of 1, the reference area is also 1. Aircraft use the wing area (or rotor-blade area) as the reference area, which makes for an easy comparison to lift. Airships and bodies of revolution use the volumetric coefficient of drag, in which the reference area is the square of the cube root of the airship's volume. Sometimes different reference areas are given for the same object in which case a drag coefficient corresponding to each of these different areas must be given.For sharp-cornered bluff bodies, like square cylinders and plates held transverse to the flow direction, this equation is applicable with the drag coefficient as a constant value when the Reynolds number is greater than 1000. For smooth bodies, like a circular cylinder, the drag coefficient may vary significantly until Reynolds numbers up to 107 (ten million).".
- Drag_equation wikiPageID "171728".
- Drag_equation wikiPageRevisionID "604703149".
- Drag_equation hasPhotoCollection Drag_equation.
- Drag_equation subject Category:Aerodynamics.
- Drag_equation subject Category:Aircraft_wing_design.
- Drag_equation subject Category:Equations_of_fluid_dynamics.
- Drag_equation type Abstraction100002137.
- Drag_equation type Communication100033020.
- Drag_equation type Equation106669864.
- Drag_equation type EquationsOfFluidDynamics.
- Drag_equation type MathematicalStatement106732169.
- Drag_equation type Message106598915.
- Drag_equation type Statement106722453.
- Drag_equation comment "In fluid dynamics, the drag equation is a formula used to calculate the force of drag experienced by an object due to movement through a fully enclosing fluid. The formula is accurate only under certain conditions: the objects must have a blunt form factor and the fluid must have a large enough Reynolds number to produce turbulence behind the object.".
- Drag_equation label "Drag equation".
- Drag_equation label "Equação do arrasto".
- Drag_equation label "阻力方程".
- Drag_equation sameAs Equação_do_arrasto.
- Drag_equation sameAs m.0171y7.
- Drag_equation sameAs Q9300786.
- Drag_equation sameAs Q9300786.
- Drag_equation sameAs Drag_equation.
- Drag_equation wasDerivedFrom Drag_equation?oldid=604703149.
- Drag_equation isPrimaryTopicOf Drag_equation.