In this study, we focused on the effect of the degree of floc growth on the moving velocity of the interface between sediment of flocculated montmorillonite and supernatant in the semi-dilute suspension, which is characterized by the start of an extremely slow movement of interface followed by an abrupt settling and ending in consolidation. Na-montmorillonite suspension coagulated under different ionic strengths, ranging from 0.5 to 1.5 M of NaCl, was placed in a settling cylinder. The initial height of suspension was varied from 13 to 50 cm. The flocculated suspension was left to settle in the cylinder after the manual mixing of end-over-end. Changes in the height of the interface between the flocculated sediment and the transparent supernatant were measured as a function of elapsed time. It was confirmed that the maximum settling velocity increased with an increase in the height of cylinder within the range of our measurement. This tendency was found to be more significantly pronounced by the growth of flocs. This result indicates the presence of a feed-forward mechanism to enhance the upward motion of fluid or downward motion of flocculated sediment, or both. That means, sedimentation is accelerated by the growth of big flocs, and the growth of big flocs is accelerated by the sedimentation. These motions will eventually induce the generation of an upward plume or channel of water. The formed plume flutters slowly with rather a large scale. We term this phenomenon the “sedimentation turbulence.”

中文翻译：

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NaCl浓度和圆柱高度对半稀释状态下蒙脱土絮凝悬浮液沉降的影响

在这项研究中，我们集中于絮状生长程度对絮凝的蒙脱石沉淀物与半稀释悬浮液中上清液之间界面移动速度的影响，其特征在于界面开始缓慢移动，随后突然解决并最终合并。将在不同离子强度（0.5至1.5 M NaCl）下凝结的钠蒙脱土悬浮液置于沉降缸中。悬浮液的初始高度在13到50厘米之间变化。在人工颠倒混合之后，将絮凝的悬浮液留在圆筒中以使其沉降。测量絮凝的沉淀物和透明上清液之间的界面高度的变化，作为经过时间的函数。可以确定的是，在我们的测量范围内，最大沉降速度随着缸体高度的增加而增加。发现絮凝物的生长更明显地表明了这种趋势。该结果表明存在前馈机构以增强流体的向上运动或絮凝的沉积物的向下运动，或两者兼而有之。这意味着，大絮状物的生长加速了沉淀，而大絮状物的加速了沉淀。这些运动最终将导致向上的羽状流或水通道的产生。形成的羽流以相当大的速度缓慢扑动。我们称这种现象为“沉淀湍流”。发现絮凝物的生长更明显地表明了这种趋势。该结果表明存在前馈机构以增强流体的向上运动或絮凝的沉积物的向下运动，或两者兼而有之。这意味着，大絮状物的生长加速了沉淀，而大絮状物的加速了沉淀。这些运动最终将导致向上的羽状流或水通道的产生。形成的羽流以较大的速度缓慢扑动。我们称这种现象为“沉淀湍流”。发现絮凝物的生长更明显地表明了这种趋势。该结果表明存在前馈机构以增强流体的向上运动或絮凝的沉积物的向下运动，或两者兼而有之。这意味着，大絮状物的生长加速了沉淀，而大絮状物的加速了沉淀。这些运动最终将导致向上的羽状流或水通道的产生。形成的羽流以相当大的速度缓慢扑动。我们称这种现象为“沉淀湍流”。沉积作用促进了大絮状物的生长。这些运动最终将导致向上的羽状流或水通道的产生。形成的羽流以相当大的速度缓慢扑动。我们称这种现象为“沉淀湍流”。沉积作用促进了大絮状物的生长。这些运动最终将导致向上的羽状流或水通道的产生。形成的羽流以相当大的速度缓慢扑动。我们称这种现象为“沉淀湍流”。