休止角
机械
流量(数学)
粒状材料
颗粒物质
阀体孔板
离心机
沙漏
物理
地质学
材料科学
岩土工程
工程类
机械工程
天文
核物理学
作者
Paul G. Hofmeister,Jürgen Blum,D. Heißelmann
出处
期刊:Nucleation and Atmospheric Aerosols
日期:2009-01-01
被引量:23
摘要
To gain a better understanding of the surfaces of planets and small bodies in the solar system, the flow behavior of granular material for various gravity levels is of utmost interest. We performed a set of reduced‐gravity measurements to analyze the flow behavior of granular matter with a quasi‐2D hourglass under coarse‐vacuum conditions and with a tilting avalanche box. We used the Bremen drop tower and a small centrifuge to achieve residual‐gravity levels between 0.01 g0 and 0.3 g0. Both experiments were carried out with basalt and glass grains as well as with two kinds of ordinary sand. For the hourglass experiments, the volume flow through the orifice, the repose and friction angles, and the flow behavior of the particles close to the surface were determined. In the avalanche‐box experiment, we measured the duration of the avalanche, the maximum slope angle as well as the width of the avalanche as a function of the gravity level.
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