Fourier number ( thermal )


The Fourier number (Fo) or Fourier modulus, is a dimensionless number that characterizes heat conduction. it is the ratio of diffusive/conductive transport rate by the quantity storage rate and arises from non-dimensionalization of the heat equation. The transported quantity is usually either heat or matter (particles).

Related formulas


FohFourier number (dimensionless)
αThe thermal diffusivity (m2/s)
tThe characteristic time (s)
LThe length through which conduction occurs (m)