Structural diagram of mass transfer in larch wood during convective drying

The article provides a substantiation of the structural diagram of the moisture removal mechanism, which is similar to baromembrane process,from larch sawnwood during convective drying. The concept proposed is based on such provisions as the presence of a semipermeable membranes system in larch wood and the chemical activity of larch wood, which leads to the formation of a gas-vapor mixture in volumes many times exceeding the volume of the sample itself. As a result, mass transfer of an aqueous solution of extractive substances from the center of the board to the surface is observed. The passage of an aqueous solution of extractives through a system of semi-permeable membranes leads to the separation of the solution into concentrate and permeate. The change in the physical state of permeate leads to the formation of the layer that greatly reduces the intensity of the moisture removal from the wood. Then the entire duration of drying should be considered as the sum of two clearly marked periods - intensive and slow. The aim of the work is to substantiate the structural diagram of mass transfer in larch wood during convective drying.