Drag Coefficient
Drag Coefficient :
A dimensionless ratio of (a) the component of force parallel to the direction of flow (drag) exerted on a body by a fluid to (b) the kinetic energy of the fluid multiplied by a characteristic surface area of the body. In symbols, the drag coefficient CD is: qq _ force of resistance 2 where p is the fluid density, U the speed, and L a characteristic length of the body. Rayleigh's formula expresses the drag coefficient as proportional to a power of the Raynolds number Re, CD = const. (Re)". For Couett flow, n = -1 and the constant is 2. N.B. Refer to source to verify equation(s)
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