Blake Number

Written by Jerry Ratzlaff on . 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.

FORMULA

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

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

Where:

$$Bl$$ = 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