Reference problem
=====================


Geometry
---------

A quarter of the prismatic sample in :math:`70\times 70\times 280\mathrm{mm}` is considered.


Material properties
----------------------

In the drying equation:

:math:`\frac{\mathrm{dC}}{\mathrm{dt}}-\text{div}\left[D(C,T)\mathrm{grad}C\right]=0`

the diffusion coefficient :math:`D` will be of the form SECH_GRANGER:

:math:`D(C,T)=A\mathrm{exp}(\mathrm{BC})\frac{T}{{T}_{0}}\mathrm{exp}\left[-{\mathrm{QSR}}_{K}(\frac{1}{T}-\frac{1}{{T}_{0}})\right]`


* :math:`A\mathrm{=}\mathrm{2,5}{10}^{\mathrm{-}11}{m}^{2}\mathrm{/}h`


* :math:`B\mathrm{=}0.12`


* :math:`{T}_{0}\mathrm{=}273°K`


Boundary conditions and loads
-------------------------------------

Uniform and constant temperature field over time of :math:`20°C`

Concentration imposed on the banks of :math:`{C}_{\mathit{eq}}\mathrm{=}\mathrm{29,31}l\mathrm{/}{m}^{3}`


Initial conditions
--------------------

The initial water concentration is :math:`{C}_{\mathit{eq}}\mathrm{=}\mathrm{106,42}l\mathrm{/}{m}^{3}`


Transitional
-----------

Drying is calculated over a period of :math:`528h`.