Investigation of cyclic water infiltration and dry-out in coated spruce using finite-element simulations

IF 3.1 2区 农林科学 Q1 FORESTRY
Florian Brandstätter, Magdalena Senoner, Markus Lukacevic, Maximilian Autengruber, Michael Truskaller, Gerhard Grüll, Josef Füssl
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Abstract

Accurate prediction of moisture distributions in wood is among the most critical challenges in timber engineering. Achieving this requires a well-coordinated comparison of experimental methods and simulation tools. While significant progress has been made in developing simulation tools in recent years, a lack of experience with and trust in these tools continues to hinder broader implementation, especially when it comes to free water and its absorption. Investigations and model advancements have allowed for the simulation of increasingly complex cases, including one-dimensional moisture transport above the fiber saturation point (FSP) in coated boards and below FSP in coated glued laminated timber (GLT). However, free water flow in coated GLT beams has not yet been addressed, which can become problematic in case of extreme scenarios, such as water infiltration. In this study, we demonstrate that the multi-Fickian free water transport model developed by some of the authors can successfully simulate three-dimensional coated cases. Uncoated and coated boards and GLT members were subjected to cyclic wetting and drying, both experimentally and numerically. To simplify the calibration process of the mass transfer coefficient of free water—identified as the most significant parameter for the simulation of free water transport—experiments previously conducted by some of the authors were simulated. Based on the simulation results, approaches for an initial estimation of the mass transfer coefficient were developed. If the water uptake of coated specimens is measured three days after continuous soaking in water and the result exceeds a specific limit, the coefficient can be sufficiently predicted. The simulation and experimental results show a good agreement.

利用有限元模拟研究涂层云杉的循环渗水和干涸。
准确预测木材中的水分分布是木材工程中最关键的挑战之一。实现这一目标需要对实验方法和模拟工具进行协调一致的比较。虽然近年来在开发模拟工具方面取得了重大进展,但缺乏对这些工具的经验和信任仍然阻碍了这些工具的广泛应用,特别是在涉及自由水及其吸收时。研究和模型的进步使得模拟越来越复杂的情况成为可能,包括涂层板中纤维饱和点(FSP)以上和涂层胶合层压木材(GLT)中纤维饱和点以下的一维水分输送。然而,涂层GLT梁中的自由水流尚未得到解决,在极端情况下,如水渗透,这可能会成为问题。在这项研究中,我们证明了由一些作者开发的多菲克自由水输运模型可以成功地模拟三维包覆情况。未涂布和涂布板和GLT成员受到循环润湿和干燥,实验和数值。为了简化自由水传质系数的标定过程,本文对部分作者先前进行的自由水传质系数进行了模拟。根据仿真结果,提出了初始估计传质系数的方法。如果连续浸水3天后测量包覆试样的吸水性,结果超过特定的极限,则可以充分预测该系数。仿真结果与实验结果吻合较好。补充信息:在线版本包含补充资料,可在10.1007/s00226-025-01629-7获得。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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来源期刊
Wood Science and Technology
Wood Science and Technology 工程技术-材料科学:纸与木材
CiteScore
5.90
自引率
5.90%
发文量
75
审稿时长
3 months
期刊介绍: Wood Science and Technology publishes original scientific research results and review papers covering the entire field of wood material science, wood components and wood based products. Subjects are wood biology and wood quality, wood physics and physical technologies, wood chemistry and chemical technologies. Latest advances in areas such as cell wall and wood formation; structural and chemical composition of wood and wood composites and their property relations; physical, mechanical and chemical characterization and relevant methodological developments, and microbiological degradation of wood and wood based products are reported. Topics related to wood technology include machining, gluing, and finishing, composite technology, wood modification, wood mechanics, creep and rheology, and the conversion of wood into pulp and biorefinery products.
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