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Purifier Stokes Settling Velocity

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Settling velocity of a dispersed-water droplet in oil: v = d²·(ρ_w − ρ_o)·g / (18·μ). The basis of centrifugal purifier sizing.

Formula

$$ v = \frac{d^2 (\rho_w - \rho_o) g}{18 \mu} $$

Symbol legend

SymbolMeaningUnitSource
$d$Droplet diameterminput µm/10^6
$\rho_w, \rho_o$Water and oil densitieskg/m³fluid property
$μ$Oil dynamic viscosityPa·sASTM D445 at T

Sources

  • Alfa Laval - Marine Purifier Theory.