Particle advection by turbulent bores—Orientation effects
Particle advection by turbulent bores—Orientation effects
复制标题
湍流孔引起的粒子平流——方向效应
DOI：
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发表时间：
2001
期刊：
影响因子：
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通讯作者：
Andrew Moore
中科院分区：
文献类型：
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作者：
C. Petroff;Andrew Moore
水力重建古太阳穴的关键在于了解钻孔大小和颗粒平流长度之间的关系。虽然前人的研究表明孔径大小、颗粒大小和颗粒平流长度之间确实存在关系，但还没有人研究颗粒形状、初始取向和平流长度之间的关系。我们用9个铝矩形棱柱和5个铝立方体进行了实验，以确定形状对平流距离的影响。棱镜的大小经过调整，使得颗粒体积保持不变，而立方体的体积却在变化。井筒高度和速度保持不变。在每个实验中都放置了棱镜，使不同的面面对流动。结果表明，对于相同的颗粒体积和密度，平流距离是沿流动方向的轴长的函数。随着流动方向上颗粒轴长度的增加，其平流长度减小。例如，棱镜的平流长度是由第三轴的长度决定的。这些结果表明，基于不规则形状物体的海啸水力重建可能取决于形状因子和物体的原始方位。
Hydraulic reconstruction of paleotsunamis hinges on understanding the relationship between bore size and particle advection length. Although previous studies have shown that a relationship does exist between bore size, particle size, and particle advection length, none have studied the relationship between particle shape, initial orientation and advection length. We performed experiments with nine aluminum rectangular prisms and five aluminum cubes to determine the effect of shape on advection distance. The prisms were sized so that particle volume remained constant while the volume of the cubes varied. Bore height and velocity were held constant. Prisms were placed so that a different face was facing the flow for each experiment. Our results show that, for constant particle volume and density, the advection distance is a function of the axis length along the direction of flow. As the length of the particle axis in the flow direction increases, its advection length decreases. For example, the advection length of a prism with a given plane facing the flow is determined by the length of the third axis. These results suggest that tsunami hydraulic reconstructions based on irregularly shaped objects may depend on the shape factor and on the original orientation of the objects.