Effects of Density Ratio on Sedimentary Similitude
Effects of Density Ratio on Sedimentary Similitude
复制标题
密度比对沉积相似度的影响
DOI：
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发表时间：
1968
期刊：
影响因子：
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通讯作者：
W. Field
中科院分区：
文献类型：
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作者：
W. Field
研究了密度比值与原型不同的移动床模型是否可以实现显着相似的问题。落入垂直振荡的流体柱中的颗粒的运动方程通过线性标度变得无量纲，从而最小化密度比的影响。结果表明，在这种情况下颗粒的平均下落速度小于其在静止流体中的最终沉降速度。通过尺寸分析和物理推理的结合，导出了比例比，在所考虑的冲刷现象的特定情况下，比例比给出了比之前建议的更好的相关性。
The question of whether or not significant similarity can be achieved in a movable bed model with a different value of density ratio from that in the prototype is examined. The equation of motion of a particle falling in a vertically oscillating column of fluid is made dimensionless by a linear scale which minimizes the effect of density ratio. It is shown that the average fall velocity of the particle in such circumstances is less than its terminal settling velocity in still fluid. By a combination of dimensional analysis and physical reasoning, scale ratios are derived which give better correlation for various density ratios in the particular case of the scour phenomenon considered than those suggested previously.