Impact-induced splash and spill in a quasi-confined granular medium
Impact-induced splash and spill in a quasi-confined granular medium
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准受限颗粒介质中撞击引起的飞溅和溢出
DOI：
10.1016/j.physa.2005.08.021
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发表时间：
2005
影响因子：
3.3
通讯作者：
R. Thakurdas
中科院分区：
文献类型：
--
作者：
S. Ogale;S. Shinde;Priyadarshini Karve;A. Ogale;Anjali A. Kulkarni;A. Athawale;A. Phadke;R. Thakurdas
本文研究了小球从高处落入一个小的敞口容器中的颗粒状介质时所引起的飞溅和溢出效应。使用不同的颗粒介质，即大米、芥菜籽、小麦奶油和塑料珠。溢出的颗粒物质的量（W，克）作为落球高度的函数进行测量，并针对不同情况进行比较。还记录了飞溅过程的数字图像。可以看出，W量随冲击能量近似线性地变化。有趣的是，一个明显的向上跳跃被认为是在特定的冲击能量的情况下，芥菜种子的溢出量，具有球形形状，也表现出一些充电效果。对于具有大致相似性质的塑料珠的情况，也证实了类似的跳跃。虽然参数，如每粒质量和包装密度的情况下，芥菜种子是中间的大米和奶油的小麦，溢出量相当的冲击能量是相当高的前一种情况。这种非单调性的行为的可能原因进行了讨论的晶粒形状和性能的差异。实验还进行了使用相同类型的塑料珠，但有四个不同的尺寸，以探索溢出量的依赖性珠的大小。还检查了各种珠类型的容器大小依赖性。有趣的系统学，这是定性讨论。
The splash and spill effects caused by the impact of a ball dropped from a height into a granular medium held in a small open container are examined. Different granular media, namely rice, mustard seeds, cream of wheat and plastic beads are used. The quantity of spilled-over granular matter (W, grams) is measured as a function of the ball-drop height and compared for different cases. Digital pictures of the splash process are also recorded. The quantity W is seen to vary approximately linearly with the energy of impact. Interestingly, a distinct upward jump is seen in the spilled quantity at specific impact energy in the case of mustard seeds, which have spherical shape and also exhibit some charging effects. Similar jump was also confirmed for the case of plastic beads with broadly similar properties. Although the parameters such as mass per grain and packing density for the case of mustard seeds are intermediate between those for rice and cream of wheat, the spill quantity for comparable impact energy is considerably higher in the former case. The possible reasons for this non-monotonicity of behavior are discussed in terms of the differences in grain shapes and properties. Experiments are also performed using plastic beads of the same type but with four different sizes to explore the dependence of spilled quantity on bead size. The container size dependence is also examined for various bead types. Interesting systematics are seen, which are discussed qualitatively.