Water Migration Characteristics of Pinus Sylvestris During the Drying Process Studied by Single-sided Nuclear Magnetic Resonance

doi:10.11938/cjmr20233083

Abstract

Abstract:

Investigating the moisture migration during the wood drying process can help improve wood utilization. Single-sided nuclear magnetic resonance (NMR) technology facilitates such investigation with its advantage in conducting one-dimensional measurements along different directions of wood, allowing for the detection of moisture transfer at different depths along the axial and transverse directions during the wood drying process. This research focused on Pinus sylvestris var.mongolica wood, on which a glue sealing technique was employed to ensure that the moisture only transfers along the axial or transverse axis, and the apparent transverse relaxation time (T_2app) was utilized to delve into the changes of moisture content at various depths during the drying process. The results showed that at the first 2 hours of the drying process, there was a little free water near the evaporation surface of Pinus sylvestris var.mongolica wood, followed by a scarcity of free water during the drying process, and a noticeable moisture content gradient was observed near the evaporation surface. When the moisture transferred along the axial direction, the farther the moisture was away from the evaporation surface, the more uniform the moisture distribution was. When the moisture transferred along the tangential direction, the farther the moisture was away from the evaporation surface, the more obvious the moisture difference in each layer was. By single-sided NMR technology, it is possible to ascertain the moisture content of wood at various depths, thereby offering a theoretical framework for revealing the migration mechanism of water within wood.

Key words: single-sided NMR, wood drying, moisture migration, apparent transverse relaxation time (T_2app), migration mechanism

CLC Number:

ZHU Xiaofeng, ZHAO Zhihong, TAN Rui, ZHOU Long, WANG Yichuan, LIU Wenjing, ZHANG Minghui, LIU Huabing. Water Migration Characteristics of Pinus Sylvestris During the Drying Process Studied by Single-sided Nuclear Magnetic Resonance[J]. Chinese Journal of Magnetic Resonance, 2024, 41(2): 173-183.

Figures/Tables 7

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干燥时间/h	结合水		自由水
干燥时间/h	T_2app/ms	峰面积	T_2app/ms	峰面积
0	1.75	0.12114	37.6	0.47158
2	1.52	0.11594	37.6	0.41266
4	1.32	0.10656	37.6	0.32935
6	1.25	0.10434	37.6	0.22453
8	1.12	0.96945	37.6	0.13512
10	1.00	0.09549	32.7	0.07232
12	0.87	0.09338	32.7	0.02756
14	0.38	0.07289	12.3	0.01119
16	0.29	0.07008	11.5	0.01568