Dimensionless Fourier time = tD

Dimensionless quantity characterising transient (time dependant) Heat Transfer:

(1)	$\begin{array}{l}\displaystyle \mbox{Fo} = t_D = \frac{a \cdot t}{L^2}\end{array}$

where

$\begin{array}{l}t\end{array}$	Heat Transfer transient time
$\begin{array}{l}a\end{array}$	Thermal Diffusivity
$\begin{array}{l}L\end{array}$	Characteristic length of Heat Transfer

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