Study on Moisture Movement in Wood with X-ray CT scanner.
用 X 射线 CT 扫描仪研究木材中的水分运动。
基本信息
- 批准号:61560189
- 负责人:
- 金额:$ 1.54万
- 依托单位:
- 依托单位国家:日本
- 项目类别:Grant-in-Aid for General Scientific Research (C)
- 财政年份:1986
- 资助国家:日本
- 起止时间:1986 至 1987
- 项目状态:已结题
- 来源:
- 关键词:
项目摘要
Moisture distribution in drying were non-destructively detected with X-ray CT scanner. In the first stage of this research, methods were investigated to distinguish CT number attributed the moisture only from total CT number obtained directly with CT scanner and to improve the accuracy of moisture measurment using silicon rubber bags surrounding the sample. Moisture contents on internal cross section could be non-destructively measured in the finest of 1% below 40% range.In the second stage, applying the method to detect the moisture distribution of Douglas-fir thick quarter sawn lumber (6 cm thickness) in drying, change of moisture distribution in thickness direction was measured. The sample had probbably a homogeneous property for moisture movement. Also, it was assumed that the diffusion coefficient was continuously changing with moisture content. On this assumption, moisture contents on the surface of sample were reversely calculated from the relationship between diffusion coefficient and moisture content. Moisture content on the surface should be set the higher value of about 6% in high moisture content range and the higher value of 3-4% in low range than equilibrium moisture contents, in solving the Fick's 2nd law with the finite difference method. Describing moisture movement with moisture content as driving force, the diffusion coefficient was almost constant with moisture content change.
采用X射线CT扫描仪对干燥过程中的水分分布进行了无损检测。在本研究的第一阶段,研究了如何区分CT扫描仪直接获得的总CT数和仅归因于水分的CT数,以及如何提高用硅橡胶袋包裹样品测量水分的准确性。在第二阶段,应用该方法对6cm厚的美国花旗松四分锯锯材在干燥过程中的含水率分布进行了检测,测量了其在厚度方向上的含水率分布变化。样品可能具有水分移动的均匀性。此外,它被假定为扩散系数是连续变化的水分含量。在此假设上,根据扩散系数与含水率的关系,计算出试样表面的含水率。在用有限差分法求解菲克第二定律时,表面含水量在高含水量范围内应设定为高于平衡含水量的6%左右,在低含水量范围内应设定为高于平衡含水量的3-4%。以含水率为驱动力描述水分运动,扩散系数随含水率的变化几乎为常数。
项目成果
期刊论文数量(1)
专著数量(0)
科研奖励数量(0)
会议论文数量(0)
专利数量(0)
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