Fourier Number

Written by Jerry Ratzlaff on . Posted in Dimensionless Numbers

Fourier number, abbreviated as Fo, also called Fourier modulus, a dimensionless number, is the ratio of heat conduction rate to the rate of thermal energy storage in a solid.  This is mainly used in unsteady state heat transfer.


Fourier number calculator


Fourier number formula

\(\large{ Fo = \frac{\alpha \; t}{l_c^2  }  }\)   


\(\large{ Fo }\) = Fourier number

\(\large{ l_c }\) = characteristic length

\(\large{ \alpha }\)  (Greel symbol alpha) = thermal diffusivity

\(\large{ t }\) = time



Tags: Equations for Heat Transfer Equations for Temperature Calculators