# Is coefficient of drag constant?

**Is coefficient of drag constant?**In

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**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.

c_{d} |
Item |
---|---|

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

.

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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