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15.3.1 Spherical Drag Law

The drag coefficient, $C_D$, for smooth particles can be taken from


C_D = a_1 + \frac{a_2}{\rm Re} + \frac{a_3}{{\rm Re}^2} (15.3-1)

where $a_1$, $a_2$, and $a_3$ are constants that apply over several ranges of Re given by Morsi and Alexander [ 238].

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