Blake Number

Written by Jerry Ratzlaff. Posted in Dimensionless Numbers

Blake number is a dimensionless number proportional to inertial force and viscous force and is used in momentum transfer and flow through beds of solids.


\(Bl = \frac {V \rho}  {\mu \left( 1- \epsilon  \right) s} \)

\(Bl = \frac {G}  {\mu \left( 1- \epsilon  \right) s} \)


\(Bl\) = Blake number

\(V\) = velocity

\(\rho\) (Greek symbol rho) = density

\(\mu\) (Greek symbol mu) = viscosity

\(G\) = mass velocity

\(\epsilon\) (Greek symbol epsilon) = void fraction

\(s\) = particle area or volume