Size of scallops and ripples formed by flowing water
Size of scallops and ripples formed by flowing water
复制标题
扇贝大小和流水形成的波纹
作者：
R. M. Thomas
水在可溶性固体壁上的通过通常会产生交叉的多边形凹陷或马蹄形凹坑，称为扇贝和凹槽1，2。这些表面变形的几何形状在给定的流动条件下是非常可再现的，但是没有普遍同意的理论框架来预测它们的特征尺寸，例如连续的横向脊之间的间距。我在这里提出的间接证据支持的假设，可溶性表面的扇贝是由于在湍流附近的被动壁固有的涡流图案的印记，并认为，小波纹颗粒床可能会形成在基本上相同的方式。
THE passage of water over a soluble solid wall often gives rise to intersecting polygonal depressions or horseshoe-shaped pits known as scallops and flutes1,2. The geometry of these surface deformations is remarkably reproducible in given flow conditions, but there is no generally agreed theoretical framework for predicting their characteristic dimensions, such as the spacing between successive transverse ridges. I present here indirect evidence in support of the hypothesis that the scalloping of soluble surfaces is due to the imprint of eddy patterns inherent in turbulent flow near a passive wall, and argue that small ripples on a granular bed may be formed in essentially the same way.