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Evaluation of capacillary radii distribution in wood by the balance of water potential.

通过水势平衡评估木材中的毛细管半径分布。

基本信息

批准号：
10660165
负责人：
HAYASHI Kazuo
金额：
$ 2.24万
依托单位：
EHIME UNIVERSITY
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
1998
资助国家：
日本
起止时间：
1998 至 1999
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-10660165/
关键词：
CENTRIFUGAL FORCE MENISCUS UNSTEADY-STATE FLOW IN WOOD WATER POTENTIAL PERMEABILITY ASPIRATED BORDERED PIT PAIRS DAMAGE OF TORUS CAPILLARY RADIUS 水分移動乾燥トールスの破壊温度依存性水分非定常状態

项目摘要

If the dehydration behavior were investigated under centrifugal fields, water potential which were caused in wood was calculated. The water potential in wood means to load the stress between outside and inside of cell. We must consider the damage at the weakest place in cell such as bordered pit pairs.1. The relationship between the water saturation ratio (SR) after the centrifugal treatment and the measure of water potential (Y) in the specimen was expressed by a following simple linear regression. LogィイD210ィエD2SR = αY + 2. "α" is new expression of the permeability under non-steady flow. The results showed that Sugi had a larger variation of water permeability than Douglas fir and was estimated to have a good water permeability than Douglas fir from the comparison of the slope2. Judging from the dehydration behavior under the centrifugal fields, it is estimated that torus were aspirated to pit border by the pressure differential of 0.119 to 0.178 Mpa. And then it is calculated that the stress which is subject to damage on torus is 0.248 to 0.68 Mpa.3. Torus in Sugi wood have more weak than that in Douglas fir, namely, the overlapped area between torus and pit border in sugi was less than Douglas fir and the thickness of torus is thinner. Damaged torus in sapwood were statistically measured in drying process and under centrifugal fields. In drying process, the number of damaged torus depended on the length of specimen. It decreased with the increase of temperature. On the other hand, it increased with the increase of temperature in the centrifugal fields. Damaged torus in microwave drying were less than in convective drying. The ratio of damaged torus had the closely relation with impregnation of dye solution.

研究了离心力作用下木材的脱水行为，计算了木材内部产生的水势。木材的水势是指木材细胞内外所承受的应力。我们必须考虑到细胞中最薄弱的地方，如有边的纹孔对。离心处理后的水饱和比（SR）与试样中的水势（Y）的测量值之间的关系由以下简单线性回归表示。对数对数D210对数D2 SR = αY + 2。“α”是非稳定渗流条件下渗透率的新表达式。结果表明，杉比道格拉斯冷杉具有更大的透水性变化，并从坡度的比较中估计杉比道格拉斯冷杉具有更好的透水性2。从离心力场作用下的脱水行为来看，在0.119 ~ 0.178Mpa的压差作用下，环面被吸到纹孔边缘。进而计算出圆环面受到破坏的应力为0.248 ~ 0.68 Mpa。3.杉材的纹孔比道格拉斯冷杉的纹孔弱，即杉材纹孔与纹孔边缘的重叠面积小于道格拉斯冷杉，纹孔厚度也较薄。统计测量了边材在干燥过程中和离心力场下的受损花托。在干燥过程中，损伤环的数量取决于试样的长度。随着温度的升高，其含量降低。另一方面，在离心场中，随着温度的升高，它增加。微波干燥中的破损环比对流干燥中的少。破损率与染料溶液的浸渍有密切关系。