A novel experimental technique and its application to study the effects of particle density and flow submergence on bed particle saltation
A novel experimental technique and its application to study the effects of particle density and flow submergence on bed particle saltation
复制标题
DOI：
10.1080/00221686.2016.1233583
复制
发表时间：
2017-01-01
影响因子：
2.3
通讯作者：
Witz, Matthew
中科院分区：
文献类型：
--
作者：
Amir, Mohammad;Nikora, Vladimir;Witz, Matthew
本文提出了一种利用多床层颗粒瞬时压力记录的冲击数据来测量床层颗粒飞行时间和幅度的新技术。与其他方法相比，它有可能测量更多的粒子跳跃，从而生成足够长的记录，以便对感兴趣的变量进行良好的收敛统计。采用四相机粒子图像测速系统的跟踪方法，对所提出的技术进行了独立测量验证。该技术在实验室研究中的应用表明，飞行持续时间和高度的概率分布和统计矩强烈依赖于水流浸没和颗粒密度。
A novel technique has been developed to measure bed particle flight durations and amplitudes using the impact data from the records of instantaneous pressure acting on multiple bed particles. It has the potential to measure many more particle jumps compared to other methods, thus generating records long enough for well-converged statistics of the variables of interest. The proposed technique has been validated with independent measurements by a tracking method using a four camera particle image velocimetry system. The application of this technique in a laboratory study revealed that probability distributions and statistical moments of flight durations and heights are strongly dependent on flow submergence and particle density.