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首页> 外文期刊>Environmental Science & Technology >Visualizing and Quantifying Dose Distribution in a UV Reactor Using Three-Dimensional Laser-Induced Fluorescence
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Visualizing and Quantifying Dose Distribution in a UV Reactor Using Three-Dimensional Laser-Induced Fluorescence

机译：使用三维激光诱导荧光在UV反应器中可视化和量化剂量分布

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摘要

Evaluating the performance of typical water treatment UV reactors is challenging due to the complexity in assessing spatial and temporal variation of UV fluence, resulting from highly unsteady, turbulent nature of flow and variation in UV intensity. In this study, three-dimensional laser-induced fluorescence (3DLIF) was applied to visualize and quantitatively analyze a lab-scale UV reactor consisting of one lamp sleeve placed perpendicular to flow. Mapping the spatial and temporal fluence delivery and MS2 inactivation revealed the highest local fluence in the wake zone due to longer residence time and higher UV exposure, while the lowest local fluence occurred in a region near the walls due to short-circuiting flow and lower UV fluence rate. Comparing the tracer based decomposition between hydrodynamics and IT revealed similar coherent structures showing the dependency of fluence delivery on the reactor flow. The location of tracer injection, varying the height and upstream distance from the lamp center, was found to significantly affect the UV fluence received by the tracer. A Lagrangian-based analysis was also employed to predict the fluence along specific paths of travel, which agreed with the experiments. The 3DLIF technique developed in this study provides new insight on dose delivery that fluctuates both spatially and temporally and is expected to aid design and optimization of UV reactors as well as validate computational fluid dynamics models that are widely used to simulate UV reactor performances.
机译：评估典型水处理UV反应器的性能具有挑战性，因为评估流量的高度不稳定，湍流性质和UV强度变化会导致评估UV通量的时空变化，因此非常复杂。在这项研究中，应用了三维激光诱导荧光（3DLIF）来可视化和定量分析实验室规模的UV反应器，该反应器由一个垂直于流动的灯套组成。绘制时空注量传递和MS2灭活的图谱显示，由于更长的停留时间和更高的UV暴露，尾流区的局部注量最高，而短路和较低的UV则在壁附近产生了最低的局部注量。通量率。比较基于示踪剂的流体动力学和IT分解，发现相似的相干结构显示了通量输送对反应器流量的依赖性。发现示踪剂注入的位置会改变高度和距灯中心的上游距离，会显着影响示踪剂接收到的UV通量。基于拉格朗日的分析也被用来预测沿着特定行进路径的能量密度，这与实验一致。这项研究中开发的3DLIF技术为剂量输送提供了新的见解，剂量输送在空间和时间上都会发生变化，有望帮助设计和优化UV反应器，并验证广泛用于模拟UV反应器性能的计算流体动力学模型。

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  • 来源
    《Environmental Science & Technology》 |2012年第24期|13220-13226|共7页
  • 作者

    Varun N. Gandhi; Philip J. W. Roberts; Jae-Hong Kim;

  • 作者单位

    School of Civil and Environmental Engineering, Georgia Institute of Technology, 200 Bobby Dodd Way, Atlanta, Georgia 30332-0373, United States,Carollo Engineers, 12592 West Explorer Drive Suite 200, Boise, ID 83712;

    School of Civil and Environmental Engineering, Georgia Institute of Technology, 200 Bobby Dodd Way, Atlanta, Georgia 30332-0373, United States;

    School of Civil and Environmental Engineering, Georgia Institute of Technology, 200 Bobby Dodd Way, Atlanta, Georgia 30332-0373, United States;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);美国《化学文摘》(CA);
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  • 正文语种 eng
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