The Role of Rotated Potential Mixing Protocols on the Behavior of a Conservative Reagent

IF 1.8 4区 环境科学与生态学 Q3 WATER RESOURCES
Michelle S. Cho, Neil R. Thomson
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Abstract

Chaotic advection is defined as the generation of “small-scale structures” from the repeated stretching and folding of fluid elements in a laminar flow regime that has the potential to enhance mixing and improve treatment effectiveness. Rotated potential mixing (RPM) flow is one configuration used to invoke chaotic advection and involves periodically re-oriented dipole flow through the transient switching of pressures at a series of radial wells. In this study, we relied on conventional models used by remediation practitioners to represent the expected flow and transport behavior of a conservative reagent subjected to chaotic advection by an RPM flow system, and then explored the impact of engineering controls on reagent mixing behavior. The various lines of evidence demonstrated that this modeling approach captured the key features of the expected transport behavior reported in other studies. Visual observations of the reagent distribution, and quantitative metrics of mixing behavior highlighted the different responses that are possible by the various combinations of RPM flow parameters explored. The results show the importance of combining theoretical considerations with practical limitations when designing an RPM flow system. The flow rate and pumping duration have direct consequences on the degree of reagent spreading and mixing. The use of the same RPM flow protocol in a heterogeneous K field led to a significantly greater degree of reagent mixing than in a homogeneous K system. The results from this investigation have important implications for the design of RPM flow protocols to promote enhanced reagent mixing and thereby improve treatment effectiveness.

Abstract Image

旋转电位混合协议对保守试剂行为的作用
混沌平流是指在层流状态下,流体元素反复拉伸和折叠而产生的 "小尺度结构",它有可能加强混合和提高处理效果。旋转势能混合(RPM)流是一种用于引发混沌平流的配置,它涉及通过一系列径向井的瞬态压力切换来周期性地重新定向偶极流。在这项研究中,我们依靠修复从业人员使用的传统模型来表示受到 RPM 流动系统混乱平流作用的保守试剂的预期流动和传输行为,然后探讨工程控制对试剂混合行为的影响。各种证据表明,这种建模方法捕捉到了其他研究中报告的预期迁移行为的主要特征。对试剂分布的直观观察和对混合行为的定量测量,突出显示了所探讨的各种 RPM 流动参数组合可能产生的不同反应。结果表明,在设计 RPM 流动系统时,将理论考虑因素与实际限制结合起来非常重要。流速和泵送持续时间对试剂的扩散和混合程度有直接影响。在异质 K 场中使用相同的 RPM 流动方案,试剂的混合程度明显高于均质 K 系统。这项研究的结果对于设计 RPM 流动方案以促进试剂混合从而提高处理效果具有重要意义。
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来源期刊
CiteScore
3.30
自引率
10.50%
发文量
60
审稿时长
>36 weeks
期刊介绍: Since its inception in 1981, Groundwater Monitoring & Remediation® has been a resource for researchers and practitioners in the field. It is a quarterly journal that offers the best in application oriented, peer-reviewed papers together with insightful articles from the practitioner''s perspective. Each issue features papers containing cutting-edge information on treatment technology, columns by industry experts, news briefs, and equipment news. GWMR plays a unique role in advancing the practice of the groundwater monitoring and remediation field by providing forward-thinking research with practical solutions.
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