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首页> 外文期刊>Wood Science and Technology >Lattice Boltzmann simulations of diffusion through native and steam-exploded softwood bordered pits
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Lattice Boltzmann simulations of diffusion through native and steam-exploded softwood bordered pits

机译：通过原生和蒸汽爆炸的软木有缘矿坑扩散的格子Boltzmann模拟

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摘要

Bordered pits connect adjacent tracheid cells in softwoods and enable water transport between them. Knowledge of how large molecules, such as polysaccharides and enzymes, are transported through pits is important to understand the extraction process of valuable biopolymers from wood. The main mass transport mechanism for large dissolved molecules in wood is diffusion, and this is investigated through mathematical modeling in the lattice Boltzmann framework utilizing SEM images and 3D reconstruction of an actual bordered pit to compute an effective diffusion coefficient. Confocal laser scanning microscopy is used to find the unobstructed diffusion coefficients in a free aqueous solution using fluorescent diffusion probes of dextran. The effect of steam explosion on pit structure is explored through the use of a simplified model. The importance of different components of a bordered pit is investigated using simulation data, and results show that the most important structural features are the borders. Expressions for the effective diffusion coefficient as a function of the free diffusion coefficient are presented for a native and for a steam-exploded pit, respectively.
机译：带边框的凹坑连接软木中相邻的气管细胞，并使水在它们之间传输。了解大分子（例如多糖和酶）如何通过坑运输的知识对于了解从木材中提取有价值的生物聚合物的过程很重要。木材中大量溶解的分子的主要传质机理是扩散，这是通过在格子Boltzmann框架中使用SEM图像进行数学建模并通过对实际有边界凹坑的3D重建以计算有效扩散系数进行研究的。共焦激光扫描显微镜用于使用右旋糖酐的荧光扩散探针在游离水溶液中查找无阻碍的扩散系数。通过使用简化模型，探索了蒸汽爆炸对矿井结构的影响。使用模拟数据研究了带边界坑的不同组成部分的重要性，结果表明，最重要的结构特征是边界。有效扩散系数作为自由扩散系数的函数的表达式分别针对天然坑和蒸汽爆炸坑给出。

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  • 来源
    《Wood Science and Technology》 |2017年第6期|1261-1276|共16页
  • 作者

    Kvist Patric; Therning Adam; Geback Tobias; Rasmuson Anders;

  • 作者单位

    Chalmers Univ Technol, Dept Chem & Chem Engn, Gothenburg, Sweden|Wallenberg Wood Sci Ctr, Stockholm, Sweden|SuMo Biomat, Gothenburg, Sweden;

    Chalmers Univ Technol, Dept Chem & Chem Engn, Gothenburg, Sweden;

    Chalmers Univ Technol, Dept Math Sci, Gothenburg, Sweden|Univ Gothenburg, Gothenburg, Sweden|SuMo Biomat, Gothenburg, Sweden;

    Chalmers Univ Technol, Dept Chem & Chem Engn, Gothenburg, Sweden|Wallenberg Wood Sci Ctr, Stockholm, Sweden;

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