Wood Drying - Wood Drying - Driving Forces For Moisture Movement

Driving Forces For Moisture Movement

Three main driving forces used in different version of diffusion models are moisture content, the partial pressure of water vapour, and the chemical potential (Skaar, 1988; Keey et al., 2000). These are discussed here, including capillary action, which is a mechanism for free water transport in permeable softwoods. Total pressure difference is the driving force during wood vacuum drying.

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Wood Drying - Driving Forces For Moisture Movement - Moisture Movement Directions For Diffusion
... diffusion rates for wood ranges from about 100 at a moisture content of 5%, to 2 - 4 at a moisture content of 25% (Langrish and Walker, 1993) ... Most of the moisture is removed from wood by lateral movement during drying ...

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