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Factors Affecting Friction

Define fluid ...

Question

Define fluid drag?

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Solution

In fluid dynamics, drag is a force acting opposite to the relative motion of any object moving with respect to the surrounding fluid. This can exist between two fluid layers or between a fluid and a solid surface.

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Q. For the laminar flow of water over a sphere, the drag coefficient

C_{F}

C_{F} = F / (ρ U^{2} D^{2})

, where F is the drag force,

ρ

is the fluid density, U is the fluid velocity and D is the diameter of the sphere. The density of water is 1000 kg/

m^{3}

. When the diameter of the sphere is 100 mm and the fluid velocity is 2 m/s, the drag coefficient is 0.5. If water now flows over another sphere of diameter 200 mm under dynamically similar conditions, the drag force (in N) on this sphere is_______

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