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

${V}_{\text{t}}=\sqrt{\frac{4g{D}_{\text{p}}}{3{C}_{\text{D}}}}\sqrt{\frac{{\rho}_{\text{L}}-{\rho}_{\text{v}}}{{\rho}_{\text{v}}}}$

(4.46)

${V}_{\text{t}}=k\frac{{\rho}_{1}-{\rho}_{\text{v}}}{{\rho}_{\text{v}}}$

(4.47)

where:

V_{t} is terminal velocity, in (m/s)

g is acceleration of gravity, in (m/s^{2})

D_{p} is diameter of fine particle, in (m)

C_{D} is drag coefficient

${\rho}_{\text{l}}$ is density of liquid, in (kg/m^{3})

${\rho}_{\text{v}}$ is density of vapor, in (kg/m^{3})

k is entrainment ...

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