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## 4.14. Typical equations, which can be used for terminal velocity calculation

### 4.14.1. Terminal velocity of a spherical fine particle settling under the influence of gravity

The terminal velocity of a spherical fine particle settling under the influence of gravity can be determined by Stokes' law:

$Vt=4gDp3CDρL−ρvρv$

(4.46)

$Vt=kρ1−ρvρv$

(4.47)

where:
Vt is terminal velocity, in (m/s)
g is acceleration of gravity, in (m/s2)
Dp is diameter of fine particle, in (m)
CD is drag coefficient
$ρl$ is density of liquid, in (kg/m3)
$ρv$ is density of vapor, in (kg/m3)
k is entrainment ...

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