Laser stripe measurement of near-wall solids distribution in channel flow with intense transport of bimodal sediment

IF 2.3 3区工程技术 Q2 ENGINEERING, MECHANICAL Experiments in Fluids Pub Date : 2024-09-08 DOI:10.1007/s00348-024-03874-1

Jan Krupička, Tomáš Picek, Václav Matoušek

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Abstract

The laser stripe method (LSM) for measuring solids distribution in sediment-laden flow has been extended to accommodate the presence of multiple sediment fractions which can differ in particle size and shape. A measurement setup with two lasers emitting green and red laser sheets was utilized to measure the vertical distribution of the near-wall concentration of a bimodal sediment mixture composed of green and red particles. The extended method was calibrated under controlled conditions in a calibration cell and was validated for measuring distributions in sediment-laden flow in a laboratory tilting flume. The results from the flume demonstrate that the extended LSM can successfully produce vertical profiles of the total concentration of all particles and the relative concentration of the two fractions. The accuracy of total concentration measurements using the extended LSM is consistent with that of the original LSM, both exhibiting an error of 0.015. The extended LSM evaluates the relative proportion of individual fractions with an error of 0.05.

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用激光条纹测量双峰沉积物密集输送的河道水流中的近壁固体分布

激光条纹法（LSM）用于测量富含沉积物的水流中的固体分布，该方法已得到扩展，以适应多种沉积物的存在，这些沉积物的粒径和形状可能各不相同。利用两个激光器发射绿色和红色激光片的测量装置，测量由绿色和红色颗粒组成的双峰沉积物混合物近壁浓度的垂直分布。扩展方法在校准池中的受控条件下进行了校准，并在实验室倾斜水槽中对测量沉积物流的分布进行了验证。水槽测量结果表明，扩展的 LSM 可以成功地测量出所有颗粒的总浓度和两个部分的相对浓度的垂直分布。使用扩展 LSM 测量总浓度的精度与原始 LSM 一致，误差均为 0.015。扩展 LSM 评估各个馏分的相对比例，误差为 0.05。

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来源期刊

Experiments in Fluids 工程技术-工程：机械

CiteScore

5.10

自引率

12.50%

发文量

157

审稿时长

3.8 months

期刊介绍： Experiments in Fluids examines the advancement, extension, and improvement of new techniques of flow measurement. The journal also publishes contributions that employ existing experimental techniques to gain an understanding of the underlying flow physics in the areas of turbulence, aerodynamics, hydrodynamics, convective heat transfer, combustion, turbomachinery, multi-phase flows, and chemical, biological and geological flows. In addition, readers will find papers that report on investigations combining experimental and analytical/numerical approaches.