Influence of Ionic Strength and Flow Rate on Silt Particle Deposition and Release in Saturated Porous Medium: Experiment and Modeling
Influence of Ionic Strength and Flow Rate on Silt Particle Deposition and Release in Saturated Porous Medium: Experiment and Modeling
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DOI：
10.1007/s11242-014-0285-8
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发表时间：
2014-02
影响因子：
2.7
通讯作者：
Z. Mesticou;M. Kacem;P. Dubujet
中科院分区：
文献类型：
--
作者：
Z. Mesticou;M. Kacem;P. Dubujet
本文研究了离子强度对粉土微粒在饱和砂土中动力输运的影响。沉积和释放现象进行了研究，通过实验柱试验。通过调节悬浮液盐度来施加不同的离子强度。两个试验配置进行：单调实验突出颗粒沉积机制，和非单调测试集中在离子强度和流速扰动下的释放现象。通过实验研究，揭示了离子强度对沉积和释放现象的影响。机械和物理化学机制的存在被实验证明。本研究证明，离子强度变化是预测恒定流中颗粒附着和脱离的主要参数。这些实验是模拟和再现通过一个数值模型的基础上，在这项研究中提出的原始存款和释放动力学。该模型是描述保守盐和微粒输运的两个多相问题的耦合。在本研究中，所提出的动力学公式是建立在所进行的实验测试构造上的。它们考虑了流速和悬浮液离子强度。建议的模型再现以及离子强度和流速变化的影响下的悬浮颗粒的传输的实验描述。它允许预测沉积和释放现象。
In this paper, the influence of ionic strength on the dynamic transport of silt microparticles through saturated sand texture is studied in the presence of repulsive interactions. The deposition and release phenomenon is investigated through experimental column trials. Different ionic strengths are applied by adjustment of suspension salinity. Two trial configurations are performed: Monotonic experiments highlight particle deposition mechanisms, and non-monotonic tests focus on release phenomena under ionic strength and flow rate perturbations. Through this experimental study, the ionic strength influence on the deposition and release phenomenon is shown. The presence of both mechanical and physico-chemical mechanisms is proved experimentally. This study proves that ionic strength variation is a primal parameter which predicts the attachment and detachment of particles at constant flow. These experiments are simulated and reproduced through a numerical model based on original deposit and release kinetics which are proposed in this study. This model is the coupling of two multiphasic problems describing conservative salt and microparticle transport. The proposed kinetics formulations are founded on performed experimental test constitutions in this study. They take into account the flow rate and the suspension ionic strength. The suggested model reproduces well the experimental description of the suspended particles transport under the influence of ionic strength and flow velocity variations. It permits to predict the deposition and release phenomenon.