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首页> 外文期刊>Wood and Fiber Science >Determining surface emission coefficient of wood using theoretical methods and near-infrared spectroscopy.
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Determining surface emission coefficient of wood using theoretical methods and near-infrared spectroscopy.

机译：使用理论方法和近红外光谱法测定木材的表面发射系数。

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摘要

Emission of surface water on wood should be controlled because moisture movement on the wood surface initiates changes in its morphological, physical, chemical, and biological properties. In this study, surface moisture content (SMC) of yellow poplar (Liriodendron tulipifera L.) wood was measured by a near-infrared spectroscopy (NIRS) technique, nondestructively and continuously, during unsteady-state desorption conditions. With these SMC data, surface emission coefficients (SECs) were determined continuously while the wood was being dried. These experimentally determined coefficients were compared with values that were converted from the theoretically determined mass transfer coefficients. The conversion method, which was developed to facilitate a comparison among the mass transfer coefficients, indicated that the boundary layer theory was useful in evaluating the degree of external moisture resistance while the wood dried. Also, the NIRS technique can be used for determining SEC at each specific point of wood, experimentally, in real time.
机译：应当控制木材表面水的排放，因为木材表面的水分运动会引发其形态，物理，化学和生物学特性的变化。在这项研究中，在非稳态解吸条件下，通过近红外光谱（NIRS）技术对黄杨木（Liriodendron tulipifera L.）木材的表面水分含量（SMC）进行了无损连续测量。利用这些SMC数据，可以在木材干燥时连续测定表面发射系数（SEC）。将这些实验确定的系数与从理论上确定的传质系数转换而来的值进行比较。为促进传质系数之间的比较而开发的转换方法表明，边界层理论可用于评估木材干燥时的外部耐湿性。而且，NIRS技术可用于通过实验实时地确定木材的每个特定点的SEC。

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