Particle aggregation in microgravity: Informal experiments on the International Space Station
Particle aggregation in microgravity: Informal experiments on the International Space Station
复制标题
微重力下的粒子聚集：国际空间站上的非正式实验
DOI：
--
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发表时间：
2014
期刊：
影响因子：
--
通讯作者：
S. Messenger
中科院分区：
文献类型：
--
作者：
S. Love;D. Pettit;S. Messenger
我们在太空中进行了实验，以研究微重力下毫米和亚毫米尺寸颗粒的聚集，这是行星形成的重要早期步骤。微粒物质包括盐（氯化钠）、糖（蔗糖）、咖啡、云母、冰、Bjurböle球粒、普通和碳质球粒陨石碎片、丙烯酸和玻璃珠，所有这些都被三重限制在透明的塑料容器中。有角度的亚毫米粒子迅速自发地形成了星团，其强度足以在原行星状星云中的湍流中幸存下来。较小的颗粒通常比较大的颗粒聚集得更强烈和更快。我们只观察到一个弱的依赖性的聚集时间粒子数密度。我们没有观察到强烈的依赖成分。圆形、光滑的颗粒聚集较弱或根本不聚集。在粒子类型的混合物中，某些相比其他相更容易聚集，从而产生控制生长团块的组成的选择效应。聚集的物理过程在本质上似乎是静电的。
We conducted experiments in space to investigate the aggregation of millimeter‐ and submillimeter‐sized particles in microgravity, an important early step in planet formation. Particulate materials included salt (NaCl), sugar (sucrose), coffee, mica, ice, Bjurböle chondrules, ordinary and carbonaceous chondrite meteorite fragments, and acrylic and glass beads, all triply confined in clear plastic containers. Angular submillimeter particles rapidly and spontaneously formed clusters strong enough to survive turbulence in a protoplanetary nebula. Smaller particles generally aggregated more strongly and quickly than larger ones. We observed only a weak dependence of aggregation time on particle number density. We observed no strong dependence on composition. Round, smooth particles aggregated weakly or not at all. In a mixture of particle types, some phases aggregated more readily than others, creating selection effects that controlled the composition of the growing clumps. The physical process of aggregation appears to be electrostatic in nature.
微观尘埃聚集体的弹跳行为
影响因子：
6.5
作者：
Seizinger
通讯作者：
Seizinger