Microgravity experiments on the collisional behavior of saturnian ring particles
Microgravity experiments on the collisional behavior of saturnian ring particles
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DOI：
10.1016/j.icarus.2009.08.009
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发表时间：
2010-04-01
期刊：
影响因子：
3.2
通讯作者：
Wolling, Kristin
中科院分区：
文献类型：
--
作者：
Heisselmann, Daniel;Blum, Juergen;Wolling, Kristin
本文介绍了两种研究宏观冰体碰撞行为的新实验方法的结果。本文报道的实验是在抛物线飞行和不来梅降落塔设施的微重力环境下进行的。使用低温抛物线飞行装置，我们能够捕捉到41次1.5厘米大小的冰球在6到22厘米每秒（-1）之间的近中心碰撞。对图像序列的分析得到恢复系数的均匀分布，其均值为(epsilon) / bar = 0.45，取值范围为epsilon = 0.06 ~ 0.84。此外，我们设计了一个原型落塔实验，用于在多达100厘米大小的弹丸集合中进行碰撞，并使用固体玻璃珠进行了第一次实验。我们能够统计分析整个系统动能的发展，这可以很好地解释为假设粒状“流体”遵循Haff定律，恢复系数恒定为epsilon = 0.64。我们还可以证明，该设置适用于研究速度为的碰撞
In this paper we present results of two novel experimental methods to investigate the collisional behavior of individual macroscopic icy bodies. The experiments reported here were conducted in the microgravity environments of parabolic flights and the Bremen drop tower facility. Using a cryogenic parabolic-flight setup, we were able to capture 41 near-central collisions of 1.5-cm-sized ice spheres at relative velocities between 6 and 22 cm s(-1). The analysis of the image sequences provides a uniform distribution of coefficients of restitution with a mean value of (epsilon) over bar = 0.45 and values ranging from epsilon = 0.06 to 0.84. Additionally, we designed a prototype drop-tower experiment for collisions within an ensemble of up to one hundred cm-sized projectiles and performed the first experiments with solid glass beads. We were able to statistically analyze the development of the kinetic energy of the entire system, which can be well explained by assuming a granular 'fluid' following Haff's law with a constant coefficient of restitution of epsilon = 0.64. We could also show that the setup is suitable for studying collisions at velocities of