The Effective Diffusion Coefficient and Mass Transfer Coefficient of Nordic Softwoods as Calculated from Direct Drying Experiments~1)

Antti Hukka

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The Effective Diffusion Coefficient and Mass Transfer Coefficient of Nordic Softwoods as Calculated from Direct Drying Experiments~1)

机译：根据直接干燥实验计算得出的北欧软木有效扩散系数和传质系数〜1）

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摘要

The effective diffusion coefficient and mass transfer coefficient of Scot's pine and Norway spruce heartwood are calculated from the measured development of the internal moisture profiles of sawn timber during drying. Measurement is made using the oven-dry method. Calculation of both coefficients is based on using an existing timber drying simulation model to iteratively optimise the parameter values for the diffusion and mass transfer coefficients of prescribed functional form. The results show that the procedure employed is a feasible method to obtain numerical values for the internal and external transfer coefficients as functions of wood moisture content and temperature. The resulting diffusion coefficient and mass transfer coefficient are applicable in the whole moisture range between green and dry states in temperatures 20-80 deg C thus covering the whole process of medium-temperature wood drying.

机译：苏格兰松和挪威云杉心材的有效扩散系数和传质系数是根据干燥过程中锯材内部水分分布的实测值计算得出的。使用烘箱干燥法进行测量。这两个系数的计算是基于使用现有的木材干燥模拟模型来迭代优化指定功能形式的扩散系数和传质系数的参数值。结果表明，所采用的方法是获得内部和外部传递系数与木材含水量和温度有关的数值的可行方法。所得的扩散系数和传质系数适用于温度在20-80摄氏度之间的绿色和干燥状态之间的整个湿度范围，因此涵盖了中温木材干燥的整个过程。

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来源
《Holzforschung》 |1999年第5期|p.534-540|共7页
作者
Antti Hukka;
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收录信息美国《科学引文索引》(SCI);美国《工程索引》(EI);
原文格式 PDF
正文语种 eng
中图分类木材加工工业、家具制造工业;
关键词
Diffusion coeffcient; Mass transfer coeffcient; Surface emission;

机译：扩散系数传质系数;表面发射;

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The Effective Diffusion Coefficient and Mass Transfer Coefficient of Nordic Softwoods as Calculated from Direct Drying Experiments~1)

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