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On the relationship between turbulent motion and bimodal size distribution of suspended flocs

机译：论悬浮絮凝物湍流运动与双峰尺寸分布的关系

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摘要

The size distribution of suspended flocs is continuously changed by the flocculation process resulting from turbulent motion. This study aims to numerically investigate the effect of turbulent motion on the size distribution of suspended flocs. In this study, the methodology for modeling a floc size distribution is suggested by adopting the stochastic approach to modeling the flocculation process. The applicability of proposed methodology is examined by comparing numerical results with the field data measured in estuarine environments. It is known from the simulation results that the lognormal distribution can be used as a descriptor for unimodal size distribution of suspended flocs in the dynamic equilibrium state. The effect of turbulent motion on floc size distribution is further investigated by analyzing the floc size distributions at different elevations from bed. The bimodal size distribution of suspended flocs is replicated when the intensity of disaggregation and Kolmogorov length scale of turbulent eddy are considered. The disaggregation process of floc is mainly governed by the turbulent motion. Based on the relationship between disaggregation process and turbulent motion, it is insisted in this study that the shape of floc size distribution is significantly affected by turbulent motion.
机译：通过湍流运动产生的絮凝过程连续地改变悬浮絮凝物的尺寸分布。本研究旨在数值上探讨湍流运动对悬浮絮凝尺寸分布的影响。在本研究中，通过采用模拟絮凝过程的随机方法来建立用于建模絮凝大小分布的方法。通过将数值结果与在河滨环境中测量的现场数据进行比较来检查所提出的方法的适用性。从仿真结果中已知，逻辑正态分布可以用作动态平衡状态下悬浮絮凝物的单峰大小分布的描述符。通过在床上分析不同凸起的絮凝尺寸分布，进一步研究了湍流运动对絮凝尺寸分布的影响。当考虑湍流涡流的分解和Kolmogorov长度尺度的强度时，复制悬浮絮凝物的双峰尺寸分布。絮凝物的分解过程主要受到湍流运动的管辖。基于分类过程与湍流运动之间的关系，在这项研究中坚持认为，絮凝尺寸分布的形状受到湍流运动的显着影响。

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  • 来源
    《Estuarine Coastal and Shelf Science》 |2020年第30期|106938.1-106938.12|共12页
  • 作者

    Byun J.; Son M.;

  • 作者单位

    Chungnam Natl Univ Dept Civil Engn Daejeon South Korea|99 Daehak Ro Daejeon South Korea;

    Chungnam Natl Univ Dept Civil Engn Daejeon South Korea|99 Daehak Ro Daejeon South Korea;

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