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Influence of uncertainty in diffusion coefficients on moisture field during wood drying

机译：木材干燥过程中扩散系数不确定性对湿度场的影响

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摘要

The paper presents an experimental measurement of diffusion coefficients of wood and theoretical analysis (stochastic analysis) based on influence of uncertainty in these coefficients on moisture field during wood drying simulations. Experimental measurement was used to verify of analytic equations for calculation of diffusion coefficients, which were implemented in the numerical simulations. Histograms show on normal distribution, but stochastic analysis was used for uniform distribution as well. Mean value of diffusion coefficient in tangential direction was calculated as 1.01610~(-10)m~2 s~(-1) and standard deviation as 0.15310~(-10) m~2 s~(-1). Stochastic analysis is based on the Monte Carlo method. The analysis proves that final moisture field has a same probability distribution as the diffusion coefficient (normal or uniform distribution) and also depicts a character of course and distribution of uncertainty in lumber during drying.
机译：本文介绍了木材扩散系数的实验测量，并基于木材干燥模拟过程中这些系数的不确定性对湿度场的影响进行了理论分析（随机分析）。实验测量用于验证用于计算扩散系数的解析方程，该方程在数值模拟中实现。直方图显示正态分布，但也使用随机分析来获得均匀分布。计算出切线方向扩散系数的平均值为1.01610〜（-10）m〜2 s〜（-1），标准偏差为0.15310〜（-10）m〜2 s〜（-1）。随机分析基于蒙特卡洛方法。分析证明，最终水分场具有与扩散系数相同的概率分布（正态分布或均匀分布），并且还描绘了木材干燥过程中的过程和不确定性分布的特征。

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