# Is coefficient of drag constant?

It is used in the drag equation in which a lower drag coefficient indicates the object will have less aerodynamic or hydrodynamic drag. The drag coefficient is always associated with a particular surface area.

General.

cd Item
1.98–2.05 Long flat plate perpendicular to flow (2D)

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Accordingly, does drag coefficient have units?

No, at least not when what is being referred to as drag coefficient is in the canonical drag equation for movement of a body through a fluid , where is the drag force, is the density of the fluid, is the flow velocity and is the cross-sectional area of the body. is in newtons, is in , is in and is in .

Beside above, can coefficient of drag be greater than 1? It’s only approximately constant. For example the drag coefficient of a sphere can vary depending on the speed and can have values greater than 1 at low Reynolds numbers.

Simply so, what is the formula for drag coefficient?

The drag coefficient Cd is equal to the drag D divided by the quantity: density r times half the velocity V squared times the reference area A. The drag coefficient then expresses the ratio of the drag force to the force produced by the dynamic pressure times the area.

What does drag coefficient depend on?

If we think of drag as aerodynamic friction, the amount of drag depends on the surface roughness of the object; a smooth, waxed surface produces less drag than a roughened surface. This effect is called skin friction and is usually included in the measured drag coefficient of the object.

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