Floc size distributions of suspended kaolinite in an advection transport dominated tank: measurements and modeling
Floc size distributions of suspended kaolinite in an advection transport dominated tank: measurements and modeling
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平流输送主导池中悬浮高岭石的絮体尺寸分布：测量和建模
DOI：
10.1007/s10236-017-1097-5
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发表时间：
2017-09
期刊：
影响因子：
2.3
通讯作者：
Maa Jerome P. -Y.
中科院分区：
文献类型：
--
作者：
Shen Xiaoteng;Maa Jerome P. -Y.
在河口和沿海水域，粘性沉积物的絮体大小及其统计分布是最重要的，因为它们影响粘性集料的沉降速度，从而影响粘性集料的沉积速率。然而，包括预测絮体大小分布(FSD)的稳健絮凝模型的开发仍处于研究阶段。在这项研究中，建立了沿流管的一维纵向(1-DL)絮凝模型。该模型是在求解种群平衡方程的基础上，利用矩的求积方法来求解FSD的。为了验证该模型的有效性，在圆柱形储罐中进行了一个以平流输送为主的实验。流场由安装在底部中心的船用泵产生，其出口朝上。这种装置产生的轴对称流动由声学多普勒测速仪(ADV)测量。测量结果提供了该1-DL模型所需的水动力输入数据。使用自动水下摄像系统获取其他测量结果，FSD，并对所得图像进行分析，以验证预测的FSD。研究表明，该1-DL模型能够有效、合理地模拟FSD及其代表规模。
In estuaries and coastal waters, floc size and its statistical distributions of cohesive sediments are of primary importance, due to their effects on the settling velocity and thus deposition rates of cohesive aggregates. The development of a robust flocculation model that includes the predictions of floc size distributions (FSDs), however, is still in a research stage. In this study, a one-dimensional longitudinal (1-DL) flocculation model along a streamtube is developed. This model is based on solving the population balance equation to find the FSDs by using the quadrature method of moments. To validate this model, a laboratory experiment is carried out to produce an advection transport-dominant environment in a cylindrical tank. The flow field is generated by a marine pump mounted at the bottom center, with its outlet facing upward. This setup generates an axially symmetric flow which is measured by an acoustic Doppler velocimeter (ADV). The measurement results provide the hydrodynamic input data required for this 1-DL model. The other measurement results, the FSDs, are acquired by using an automatic underwater camera system and the resulting images are analyzed to validate the predicted FSDs. This study shows that the FSDs as well as their representative sizes can be efficiently and reasonably simulated by this 1-DL model.
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