Non-local equilibrium continuum modeling of partially saturated drying porous media: Comparison with pore network simulations
Non-local equilibrium continuum modeling of partially saturated drying porous media: Comparison with pore network simulations
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DOI：
10.1016/j.ces.2020.115957
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发表时间：
2020-12-31
影响因子：
4.7
通讯作者：
Kharaghani, Abdolreza
中科院分区：
文献类型：
--
作者：
Ahmad, Faeez;Talbi, Marouane;Kharaghani, Abdolreza
建立了一个两方程连续介质模型来模拟多孔介质干燥过程中的传质。主要目的是捕捉所谓的非平衡效应。为此，我们在液相不动的情况下操作，使得液相和气相之间的非平衡质量交换占主导地位。该模型的制定依赖于一个升级技术。这特别允许在更坚实的基础上制定非局部平衡相变项。放大也表明，没有理由考虑在蒸汽扩散模型中的增强因子。宏观模型参数由孔隙网络干燥模拟确定。同样的模拟也被用来作为参考，与非局部平衡连续模型的预测进行比较。两方程连续介质模型的解证明了该模型对非局部平衡效应的模拟具有合理的精度。模拟结果还表明，非局部平衡效应在多孔介质表面尤为显著。(C)2020爱思唯尔有限公司保留所有权利。
A two-equation continuum model is developed to simulate the mass transfer in drying porous media. The main goal is to capture the so called non-equilibrium effect. To this end, we operate in a regime where the liquid phase is immobile so that non-equilibrium mass exchange between liquid and vapor phase dominates. The formulation of the model relies on an upscaling technique. This notably permits to formulate the non-local equilibrium phase change term on a firmer basis. The upscaling also indicates that there is no reason to consider an enhancement factor in the vapor diffusion model. The macroscopic model parameters are determined from pore network drying simulations. The same simulations are also used as a reference to compare with the predictions of the non-local equilibrium continuum model. The solution of the two-equation continuum model proves that this model simulates the non-local equilibrium effect with reasonable accuracy. Also, the simulations indicate that the non-local equilibrium effect is especially significant at the porous medium surface. (C) 2020 Elsevier Ltd. All rights reserved.