Investigation of the Effect of Cutting Directions On the Improvement of Mechanical Parameters of Treated Cork by THT: Experimental Measurement, Modelling and Optimization of Mass Transfer

IF 0.6 4区 工程技术 Q4 MECHANICS
Mechanika Pub Date : 2022-06-21 DOI:10.5755/j02.mech.26956
Abdelkrim Zemirline, T. Kermezli, M. Announ, M. Douani
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引用次数: 1

Abstract

This work aims to investigate the impact of the cutting direction on the transfer properties of both the native cork and the treated by an optimized cycle at high temperature and boiling for the purpose to improve its mechanical characteristics in all three orthotropic directions. The study of the insulation performance is based on tracking the apparent mass diffusion coefficient (Dapp) variation in order to evolve a new material with the thermal, mass, acoustic and vibratory properties needed for various applications. TGA, IR and SEM analyzes are used to confirm the enhancement of the treated cork. The Dapp of the diffusing chemical species, NaCl (0.7M), is determined by conductimetric method. In transient mode, a mathematical model of mass transfer, which includes the diffusion parameters of the chemical species, is developed. Through the calibration of the model with the experimental measurements the Dapp values ​​were determined and then refined numerically by optimization using the Bat-Algorithm. The obtained results showed that the treatment improves the diffusion property of the native (DN) compared to the treaty (DA) with the values in the order of 10-12 and 10-13 m2.s-1 respectively with a relative uncertainty of 10-7. In addition, this investigation reveals that the radial diffusion coefficient (DR) is significantly higher than the tangential diffusion (DT) and longitudinal (DL) diffusion coefficients which both are almost of the same.
切割方向对THT处理后软木材料力学参数改善的影响研究:传质实验测量、建模与优化
这项工作旨在研究切割方向对天然软木和经过高温沸腾优化循环处理的软木的传递特性的影响,以改善其在所有三个正交异性方向上的机械特性。研究绝缘性能是基于跟踪表观质量扩散系数(Dapp)的变化,以发展一种具有各种应用所需的热、质量、声学和振动性能的新材料。用热重分析仪、红外光谱和扫描电镜分析证实了处理后软木的增强作用。采用电导法测定了扩散化学物质NaCl (0.7M)的Dapp。在瞬态模式下,建立了包含化学物质扩散参数的传质数学模型。通过对模型与实验测量值的标定,确定了Dapp值,并利用蝙蝠算法进行了数值优化。结果表明,与条约(DA)相比,该处理改善了原生(DN)的扩散性能,其数值分别为10-12和10-13 m2。S-1,相对不确定度为10-7。此外,研究发现径向扩散系数(DR)明显高于切向扩散系数(DT)和纵向扩散系数(DL),两者几乎相同。
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来源期刊
Mechanika
Mechanika 物理-力学
CiteScore
1.30
自引率
0.00%
发文量
50
审稿时长
3 months
期刊介绍: The journal is publishing scientific papers dealing with the following problems: Mechanics of Solid Bodies; Mechanics of Fluids and Gases; Dynamics of Mechanical Systems; Design and Optimization of Mechanical Systems; Mechanical Technologies.
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