Influence of Clay on Solute Transport in Saturated Homogeneous Mixed Media
Influence of Clay on Solute Transport in Saturated Homogeneous Mixed Media
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粘土对饱和均质混合介质中溶质运移的影响
DOI：
10.1155/2021/1207971
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发表时间：
2021-08
期刊：
影响因子：
1.7
通讯作者：
Portia Annabelle Opoku
中科院分区：
文献类型：
--
作者：
Albert Kwame Kwaw;Zhi Dou;Jinguo Wang;Yuting Zhang;Xueyi Zhang;Wenyuan Zhu;Portia Annabelle Opoku
在本研究中，制备了四种均匀多孔介质（HPM1-HPM4），由不同比例的砂级和粘土级固体微珠组成，并将其用作单一裂缝充填体。对HPM1-HPM4在3种流速下的流动和非反应性溶质输运进行了实验，并采用常规平流-色散方程（ADE）、移动-不移动模型（MIM）和截断幂律过渡时间分布的连续时间随机游走模型（CTRW）对测量的突破曲线（btc）进行了量化。测定的btc在HPM2-HPM4（含粘土）中比在HPM1（不含粘土）中表现出更强的非菲克性行为，这意味着粘土增强了非菲克性运输。随着粘土含量的增加，ADE拟合的全局误差也增加，证实了ADE在捕捉粘土诱导的非菲克行为方面的低效率。MIM和CTRW在捕捉非菲克行为方面表现更好。尽管如此，CTRW的表现依然强劲。在HPM2和HPM3中分别添加12.5%和25%的粘土，减少了MIM中流动流体区域，增加了流动和停滞流体区域之间的溶质交换率。对于CTRW，幂律指数(。β。HPM1-HPM3的CTRW.)值分别为1.96、1.75和1.63，表明非菲克行为增强。而对于粘土含量为50%的HPM4，β。CTRW。值为1.87，表明随着黏土掺量的增加，非菲克式增强趋势出现偏差。这一偏差表明，非菲克行为的增强取决于粘土的含量。此外，流量的增加增强了非菲克式运输。β。CTRW。。
In this study, four homogeneous porous media (HPM1-HPM4), consisting of distinct proportions of sand-sized and clay-sized solid beads, were prepared and used as single fracture infills. Flow and nonreactive solute transport experiments in HPM1-HPM4 under three flow rates were conducted, and the measured breakthrough curves (BTCs) were quantified using conventional advection-dispersion equation (ADE), mobile-immobile model (MIM), and continuous time random walk (CTRW) model with truncated power law transition time distribution. The measured BTCs showed stronger non-Fickian behaviour in HPM2-HPM4 (which had clay) than in HPM1 (which had no clay), implying that clay enhanced the non-Fickian transport. As the fraction of clay increased, the global error of ADE fits also increased, affirming the inefficiency of ADE in capturing the clay-induced non-Fickian behaviour. MIM and CTRW performed better in capturing the non-Fickian behaviour. Nonetheless, CTRW’s performance was robust. 12.5% and 25% of clay in HPM2 and HPM3, respectively, decreased the flowing fluid region and increased the solute exchange rate between the flowing and stagnant fluid regions in MIM. For CTRW, the power law exponent (. β. CTRW. ) values were 1.96, 1.75, and 1.63 in HPM1-HPM3, respectively, implying enhanced non-Fickian behaviour. However, for HPM4, whose clay fraction was 50%, the . β. CTRW. value was 1.87, implying a deviation in the trend of non-Fickian enhancement with increasing clay fraction. This deviation indicated that non-Fickian behaviour enhancement depended on the fraction of clay present. Moreover, increasing flow rate enhanced the non-Fickian transport based on . β. CTRW. .
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DOI：
10.1103/physreve.94.053118
发表时间：
2016-11
期刊：
Physical review. E
影响因子：
--
作者：
Eleonora Crevacore;Tiziana Tosco;R. Sethi;G. Boccardo;D. Marchisio
通讯作者：
Eleonora Crevacore;Tiziana Tosco;R. Sethi;G. Boccardo;D. Marchisio
影响因子：
2.4
作者：
Cortis, A;Chen, YJ;Berkowitz, B
通讯作者：
Berkowitz, B
影响因子：
5.4
作者：
Chapman, SW;Parker, BL
通讯作者：
Parker, BL
影响因子：
3.6
作者：
D. Goodall;R. Quigley
通讯作者：
D. Goodall;R. Quigley
影响因子：
3.6
作者：
Y. Xiong;Guanhua Huang;Quanzhong Huang
通讯作者：
Y. Xiong;Guanhua Huang;Quanzhong Huang