The Blake number in fluid mechanics is a nondimensional number showing the ratio of inertial force to viscous force. It is used in momentum transfer in general and in particular for flow of a fluid through beds of solids. It is a generalisation of the Reynolds number for flow through porous media.
Expressed mathematically the Blake number is:
= void fraction = dynamic viscosity = fluid density = characteristic particle diameter = flow velocity
- Tomas, J. (2010). "Mechanical Process Engineering – Particle Technology". Otto von Guericke University of Magdeburg. Retrieved 11 February 2011.