Submillimetre-sized dust aggregate collision and growth properties - Experimental study of a multi-particle system on a suborbital rocket
Submillimetre-sized dust aggregate collision and growth properties - Experimental study of a multi-particle system on a suborbital rocket
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亚毫米级尘埃聚集体碰撞与生长特性——亚轨道火箭多粒子系统实验研究
DOI：
10.1051/0004-6361/201527288
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发表时间：
2016
影响因子：
6.5
通讯作者：
Weidling
中科院分区：
文献类型：
--
作者：
Brisset;Heißelmann;Weidling
在新行星系统形成的最初几步，尘埃团块在围绕新形成的星星旋转的原行星盘内生长。在这个圆盘中，尘埃颗粒之间的碰撞，由周围气体的相互作用引起，导致粘附。聚集体开始增长，直到它们的大小和相对速度足够高，碰撞导致反弹或破碎。为了研究碰撞尘埃聚集体的粘附和弹跳状态之间的转变以及多个聚集体形成团簇的过程，在REXUS 12亚轨道火箭上进行了亚轨道粒子和聚集实验（SPACE）。包括粘附和弹跳之间的统计阈值速度，它们的表面能和聚集团簇内的拉伸强度。原行星尘埃模拟材料是由单分散和多分散的SiO2颗粒组成的团聚体，粒径分别为120μm和330μm，体积填充因子约为0.37。在实验运行的150 s在重力条件下，粘附的聚集体和集群的形成和碎片的大小为几毫米observed.ResultsThe粘附概率的亚毫米大小的灰尘聚集体可以推导出从22到3厘米s-1的速度下降。由单分散颗粒组成的小聚集体在12.7 ± 2.1-1.4cm s ~（-1）处发生碰撞，由单分散颗粒组成的大聚集体在11.5 ± 1.9- 1.3cm s ~（-1）处发生碰撞，由多分散颗粒组成的大聚集体在11.7 ± 1.9-1.3cm s ~（-1）处发生碰撞。利用亚毫米级粉尘聚集体从团簇中的脱落力，得到单分散粉尘聚集体的表面能为1.6 × 10- 5 J·m-2，对于微米级单体颗粒，该表面能可缩小到1.7 × 10- 2 J·m-2，与前人对二氧化硅颗粒的测量结果吻合较好.团簇内这些聚集体的抗张强度分别为1.9 ± 2.2-1.2Pa和1.6 ± 0.7-0.6Pa。这些值与最近的抗张强度测量mm大小的二氧化硅aggregate.ConclusionsUsing我们的数据上的粘弹阈值，估计的最大聚集体尺寸可以给出。对于最小质量的太阳星云模型，聚集体的大小可以达到~1厘米。
ContextIn the very first steps of the formation of a new planetary system, dust agglomerates grow inside the protoplanetary disk that rotates around the newly formed star. In this disk, collisions between the dust particles, induced by interactions with the surrounding gas, lead to sticking. Aggregates start growing until their sizes and relative velocities are high enough for collisions to result in bouncing or fragmentation. With the aim of investigating the transitions between sticking and bouncing regimes for colliding dust aggregates and the formation of clusters from multiple aggregates, the Suborbital Particle and Aggregation Experiment (SPACE) was flown on the REXUS 12 suborbital rocket.AimsThe collisional and sticking properties of sub-mm-sized aggregates composed of protoplanetary dust analogue material are measured, including the statistical threshold velocity between sticking and bouncing, their surface energy and tensile strength within aggregate clusters.MethodsWe performed an experiment on the REXUS 12 suborbital rocket. The protoplanetary dust analogue materials were micrometre-sized monodisperse and polydisperse SiO2particles prepared into aggregates with sizes around 120μm and 330μm, respectively and volume filling factors around 0.37. During the experimental run of 150 s under reduced gravity conditions, the sticking of aggregates and the formation and fragmentation of clusters of up to a few millimetres in size was observed.ResultsThe sticking probability of the sub-mm-sized dust aggregates could be derived for velocities decreasing from ~22 to 3 cm s-1. The transition from bouncing to sticking collisions happened at 12.7+2.1-1.4cm s-1for the smaller aggregates composed of monodisperse particles and at 11.5+1.9-1.3and 11.7+1.9-1.3cm s-1for the larger aggregates composed of mono- and polydisperse dust particles, respectively. Using the pull-off force of sub-mm-sized dust aggregates from the clusters, the surface energy of the aggregates composed of monodisperse dust was derived to be 1.6 × 10-5J m-2, which can be scaled down to 1.7 × 10-2J m-2for the micrometre-sized monomer particles and is in good agreement with previous measurements for silica particles. The tensile strengths of these aggregates within the clusters were derived to be 1.9+2.2-1.2Pa and 1.6+0.7-0.6Pa for the small and large dust aggregates, respectively. These values are in good agreement with recent tensile strength measurements for ~mm-sized silica aggregates.ConclusionsUsing our data on the sticking-bouncing threshold, estimates of the maximum aggregate size can be given. For a minimum mass solar nebula model, aggregates can reach sizes of ~1 cm.
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DOI：
10.1088/0004-637x/764/2/146
发表时间：
2012-08
期刊：
The Astrophysical Journal
影响因子：
--
作者：
P. Garaud;F. Meru;M. Galvagni;C. Olczak
通讯作者：
P. Garaud;F. Meru;M. Galvagni;C. Olczak
影响因子：
4.9
作者：
Blum, Juergen;Schraepler, Rainer;Trigo-Rodriguez, Josep M.
通讯作者：
Trigo-Rodriguez, Josep M.
彗星在太阳星云不稳定中形成！ - 将彗星活动与其形成过程联系起来的实验和建模尝试
影响因子：
3.2
作者：
J. Blum;B. Gundlach;S. Muhle;J. Trigo
通讯作者：
J. Trigo
从等离子到行星
DOI：
--
发表时间：
1972
期刊：
影响因子：
--
作者：
A. Elvius
通讯作者：
A. Elvius
亚轨道粒子聚集和碰撞实验 (SPACE)：研究 REXUS 12 亚轨道火箭飞行中亚毫米级尘埃聚集体的碰撞行为。
DOI：
10.1063/1.4819443
发表时间：
2013
期刊：
The Review of scientific instruments
影响因子：
--
作者：
J. Brisset;D. Heißelmann;S. Kothe;R. Weidling;J. Blum
通讯作者：
J. Blum