堆
堆(数据结构)
机械
粒状材料
楔形(几何)
颗粒物质
地质学
流量(数学)
岩土工程
材料科学
几何学
物理
作者
L. Alonso-Llanes,E. Martínez,R. Toussaint,Ernesto Altshuler
出处
期刊:Physical review
日期:2019-06-12
卷期号:106 (1)
标识
DOI:10.1103/physreve.106.014904
摘要
If a granular material is poured from above on a horizontal surface between two parallel, vertical plates, a sand heap grows in time. For small piles, the grains flow smoothly downhill, but after a critical pile size ${X}_{c}$, the flow becomes intermittent: sudden avalanches slide downhill from the apex to the base, followed by an ``uphill front'' that slowly climbs up, until a new downhill avalanche interrupts the process. By means of experiments, controlling the distance between the apex of the sandpile and the container feeding it from above, we show that ${X}_{c}$ grows linearly with the input flux, but scales as the square root of the feeding height. We explain these facts from a phenomenological model based on the experimental observation that the flowing granular phase forms a ``wedge'' on top of the static one, differently from the case of stationary heaps. Moreover, we demonstrate that our controlled experiments allow to predict the value of ${X}_{c}$ for the common situation in which the feeding height decreases as the pile increases in size.
科研通智能强力驱动
Strongly Powered by AbleSci AI