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首页> 外文期刊>Icarus: International Journal of Solar System Studies >Free collisions in a microgravity many-particle experiment. IV. - Three-dimensional analysis of collision properties
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Free collisions in a microgravity many-particle experiment. IV. - Three-dimensional analysis of collision properties

机译：微重力多粒子实验中的自由碰撞。 IV。 -碰撞特性的三维分析

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The bouncing barrier, a parameter combination at which dust particles in the protoplanetary disk always rebound in mutual collisions, is one of the crucial steps of planet formation. In the past years, several experiments have been performed to determine the mass and velocity regimes at which perfect bouncing does occur and those where there is a chance of the aggregates sticking together. We conducted a microgravity experiment, which allows us to investigate free collisions of millimeter-sized SiO2 dust aggregates at the relevant velocities. We analyzed 52 collisions in detail with velocities of 3.4 x 10(-3) m s(-1) to 6.2 x 10(-2) m s(-1) and found four of them leading to sticking, while the other aggregates rebounded. Three out of the four sticking collisions occurred at velocities where previously only bouncing had been predicted. Although the probability for sticking is low, this opens a new possibility for growth beyond millimeter sizes. Our setup allowed us to obtain the complete three-dimensional collision information. Since most previous experiments were interpreted based on two-dimensional information, we compare our three-dimensional values with those obtained if only one projection had been available. We find that the error of a two-dimensional analysis of the collision velocity is very small. The distribution of the coefficient of restitution in the two-dimensional view is representative of the real case, but for any given collision its value can be far off. Impact parameters always have to be analyzed three-dimensionally, because the two-dimensional values are not meaningful in any way. (C) 2014 Elsevier Inc. All rights reserved.
机译：弹跳屏障是原行星盘中尘埃粒子在相互碰撞中始终反弹的参数组合，是行星形成的关键步骤之一。在过去的几年中，已经进行了一些实验来确定质量和速度机制，在该机制下，会发生完美的弹跳，而聚集体可能会粘在一起。我们进行了微重力实验，该实验使我们能够研究相应速度下毫米级SiO2尘埃聚集体的自由碰撞。我们详细分析了52次碰撞，速度从3.4 x 10（-3）m s（-1）到6.2 x 10（-2）m s（-1），发现其中四个导致粘附，而其他聚集体反弹。在四次粘连碰撞中，有三分发生在以前仅能预测弹跳的速度。尽管粘附的可能性很小，但这为超出毫米尺寸的增长开辟了新的可能性。我们的设置使我们可以获得完整的三维碰撞信息。由于以前的大多数实验都是基于二维信息来解释的，因此我们将三维值与只有一个投影可用时获得的三维值进行比较。我们发现，对碰撞速度进行二维分析的误差很小。恢复系数在二维视图中的分布代表了实际情况，但是对于任何给定的碰撞，其值都可能相去甚远。冲击参数始终必须进行三维分析，因为二维值无论如何都没有意义。 （C）2014 Elsevier Inc.保留所有权利。

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