**Related Resources: fluid flow**

### Circular Flat Disk Drag Coefficient and Drag Equation

**Air Flow Drag, Drag Coefficient Equation and Calculators
**

**Fluids Design and Engineering Data**

Air Flow Drag and Drag Coefficient Equations and Calculator

The drag coefficient (non-dimensional drag) is equal to the drag force divided by the product of velocity pressure and frontal area. The velocity may be that of the object through the air (or any other gas) or the air velocity past a stationary object. Coefficients are given for a number of geometrical shapes and also for cars, airships and struts.

Drag Equation:

Illustration |
Description |
L / d |
C_{d} |
R_{e} / 10^{4} |
Frontal Area |

Circular Flat Disk Drag |
- |
1.12 |
100 |
π d ^{2 }/ 4 |

Where:

D = Drag (N);

C_{d} = Drag Coefficient (unit less);

ρ = fluid density (kg/m^{3});

A =frontal area (m^{2});

V = fluid velocity (m/sec);

d = Diameter (m);

R_{e} = Reynolds Number (unit less)

Density of air = 1.225 kg/m^{3}

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