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.

如果在离心场下研究了脱水行为，则计算木材引起的水潜力。木材中的水潜力意味着在细胞外部和内部之间加载应力。我们必须考虑在细胞中最弱的位置（例如边界坑对）的损坏1。离心处理后的水饱和度比（SR）与样品中水电位（Y）的测量之间的关系通过以下简单的线性回归表示。 logi d210e d2sr =αy + 2。“α”是在非稳态流下渗透率的新表达。结果表明，与道格拉斯冷杉相比，Sugi的水渗透性变化更大，并且据估计，与Douglas fir相比，斜率与Douglas Fir相比具有良好的水通透性。从离心场下的脱水行为来看，据估计，圆环被压力差异为0.119至0.178 MPa。然后计算出可能损害圆环的应力为0.248至0.68 MPa.3。 Sugi木材中的圆环比道格拉斯冷杉的圆环更弱，即，sugi中的圆环和坑边框之间的重叠区域小于道格拉斯冷杉，圆环的厚度较薄。在干燥过程和离心场下，统计地测量了Sapwood中的圆环。在干燥过程中，受损的圆环数量取决于样品的长度。随着温度的升高而下降。另一方面，它随着离心场中温度的升高而增加。微波干燥中受损的圆环小于对流干燥。受损圆环的比率与染料溶液的浸渍密切相关。