Drying diffusivity
Drying diffusivity (Dww) This is defined in WUFI as the liquid transport coefficient for redistribution, measured in units of square metre per second (m2/s) describes the spreading of the imbibed water when the wetting is finished, no new water is taken up anymore and the water present in the material begins to redistribute. In a building component, this corresponds to the moisture migration in the absence of rain. The redistribution is dominated by the smaller capillaries since their higher capillary tension draws the water out of the larger capillaries.’
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