Image Analysis for Particulate Flow under Oscillatory Sheet-flow Regime
Image Analysis for Particulate Flow under Oscillatory Sheet-flow Regime
复制标题
DOI：
10.2208/kaigan.70.i_746
复制
发表时间：
2014
影响因子：
--
通讯作者：
E. Harada;H. Gotoh
中科院分区：
文献类型：
--
作者：
E. Harada;H. Gotoh
与能量耗散有关的接触和碰撞颗粒之间的相互作用主要控制振荡板流条件下的泥沙运动，即使在完全周期振荡的外力作用下，由于微观颗粒形态的变化，滞回相关的复杂行为也比周期性的复杂行为占优势。固体颗粒和载体相之间对振荡流的响应时间的差异提供了动量传递，由此产生的与相有关的颗粒应力应该被估计，以确定片状流区的详细机制。在本研究中，从通过侧壁拍摄的视频序列中提取了振荡流下的颗粒速度，从而揭示了颗粒剪应力的相变特性。
Interactions between contacting and colliding particles associated with energy dissipation mainly dominate sediment transport under oscillatory sheet-flow regime, where hysteretic-dependent complicated behavior dominates over periodical one due to a change in microscopic particle configuration even under the fully periodically oscillatory external forces. Difference in response time between solid particle and carrier phase to oscillatory flow furnish momentum transfer, resulting phase-dependent particle stress should be estimated to ascertain detail mechanism of the sheet-flow regime. In the present study, particle velocity under oscillatory flow is extracted from video sequence taken through the sidewall, accordingly phase-dependent particle shear stress is revealed.