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Dpsthree · Answer 1 · 2020-05-14T08:56:57+0000

Answer:

Drag Coefficient:

It is a dimensionless quantity that is used to quantify air friction or fluid friction i.e., drag and is commonly denoted by
$C_(d)[/ tex].It is used in Drag Equation, where a lower drag coefficient indicates that the object will have lower value of air friction or fluid friction(i.e., aerodynamic or hydrodynamic drag). It is always associated with a particular surface area.Drag Coefficient is given by:[tex]C_(d) = (2D)/(A\rho v^(2))$

Skin Friction Coefficient:

It is a dimensionless quantity which represents skin shear stress due to dynamic pressure of a free stream.

Skin Friction Coefficient is given by:

$C_(f) = (2\tau _(w))/(\rho V^(2))$

where,

$\tau _(w)$ = skin shear stress

v = free stream speed

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