A Percolation Model for Electrical Conduction in Wood with Implications for Wood-Water Relations
A Percolation Model for Electrical Conduction in Wood with Implications for Wood-Water Relations
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DOI：
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发表时间：
2008-11
影响因子：
1.4
通讯作者：
S. Zelinka;S. Glass;D. Stone
中科院分区：
文献类型：
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作者：
S. Zelinka;S. Glass;D. Stone
The first models used to describe electrical conduction in cellulosic materials involved conduction pathways through free water. These models were abandoned in the middle of the 20th century. This article re-evaluates the theory of conduction in wood by using a percolation model that describes electrical conduction in terms of overlapping paths of loosely bound or capillary water (Type II water). The model contains two physical parameters: w c , the critical moisture fraction, which is the amount of water required to form a continuous path of Type II water in wood; and σ c , the conductivity of the aqueous pathways. The model gives a good fit to previously published data of the DC conductivity of wood when w c is equal to 16% moisture content and σ c is equal to 0.88 S m -1 . This analysis indicates that electrical conduction in wood can be explained by percolation theory and that there exists a continuous path of Type II water in wood at w c , which is below the traditional fiber saturation point.
