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Drag is defined as the force exerted by a flowing fluid on a solid body
Lift force is defined as the force exerted by a flowing fluid on a solid body
The optimum amount of stream-lining is that for which
The boundary or profile drag is essentially made up of
The total drag (sometimes called as profile drag) of a body is made up of two parts: Frictional drag and pressure drag (or from drag), depending on whether the shear stresses or pressure differences cause it.
In calculating the drag force using CD the area used is
Planform area is the area of body as seen from above. This area is used for thin, flat surfaces where frictional forces are predominant as for example: flat plate, flow, airplane wings and hydrofoils.
Stake’s law is valid up to a maximum Reynolds number of
A very thin sphere is settling down in a viscous liquid at a Reynolds number of 0.2. Its drag coefficient is