| 标题 |
 Spatial Variability in the Motion of a Rolling Bead due to a Step in Bed Roughness 由于床面粗糙度的台阶导致滚动珠运动的空间变化
相关领域
阻力
机械
有孔小珠
星团（航天器）
表面光洁度
湍流
流量（数学）
减速
运动（物理）
阻力系数
物理
经典力学
几何学
地质学
材料科学
数学
复合材料
计算机科学
程序设计语言
法学
政治学
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Abstract The impact of the sudden change in bed roughness due to a cluster of motionless, submerged bed-mounted posts on the dynamics of a coarse sphere transported by the turbulent flow as bed load was experimentally and analytically studied. The rolling motion of the bead upstream of the cluster, in almost straight paths at a virtually constant velocity, switched abruptly to a spatially varied, highly perturbed motion as soon as the particle moved through the cluster interstices, following tortuous path and performing cycles of strong decelerations (due to collisions) and accelerations (due to the drag force). Analysis of measurements in terms of a simplified initial value problem showed that the slowdown of the mean velocity of the sphere depends on the mean flow velocity in the rough layer, the geometrical constraint imposed by the mean interstitial length, the features of the collisional interaction, and the bead diameter and density. |
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