A Novel Finite Element Technique for Moisture Diffusion Modeling Using ANSYS

2018 IEEE 68th Electronic Components and Technology Conference (ECTC) Pub Date : 2018-08-09 DOI:10.1109/ECTC.2018.00043

C. Diyaroglu, S. Oterkus, E. Oterkus

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引用次数: 4

Abstract

This study presents a novel modeling approach for wetness and moisture concentration in the presence of time dependent saturated moisture concentration by employing the traditional ANSYS thermal and surface effect elements. The accuracy of the present approach is established by comparison with those of the existing ANSYS “diffusion” and “coupled field” elements as well as peridynamic theory. The comparison concerns the desorption process in a fully saturated bar made of two different materials with equal and unequal values of solubility activation energy in the presence of time dependent saturated moisture concentration under uniform and nonuniform temperature conditions. The results from the present approach agree well with those of peridynamics and ANSYS “coupled field” elements if the diffusivity is specified as time dependent. Significant deviation occurs if the diffusivity is specified as temperature dependent. The ANSYS “diffusion” element is applicable only for uniform temperature, and deviation becomes significant especially for unequal values of solubility activation energy.

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一种基于ANSYS的水分扩散有限元模拟方法

本文采用传统的ANSYS热效应和表面效应单元，提出了一种新的饱和湿度随时间变化的湿度和湿度浓度建模方法。通过与ANSYS现有的“扩散”单元和“耦合场”单元以及周动力理论的比较，验证了该方法的准确性。在均匀和非均匀温度条件下，由溶解度活化能相等和不等的两种不同材料制成的完全饱和棒材在饱和水分浓度随时间变化的条件下的解吸过程。当扩散系数随时间变化时，本文方法的结果与周动力学和ANSYS“耦合场”单元的结果一致。如果将扩散系数指定为与温度相关，则会发生显著偏差。ANSYS的“扩散”单元仅适用于均匀温度，特别是在溶解度活化能不等的情况下，偏差变得明显。

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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2018 IEEE 68th Electronic Components and Technology Conference (ECTC)

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