Bouncing Behavior of Microscopic Dust Aggregates
Bouncing Behavior of Microscopic Dust Aggregates
复制标题
微观尘埃聚集体的弹跳行为
DOI:
10.1051/0004-6361/201220946
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发表时间:
2013
影响因子:
6.5
通讯作者:
Seizinger
中科院分区:
文献类型:
--
作者:
Seizinger
ContextBouncing collisions of dust aggregates within the protoplanetary disk may have a significant impact on the growth process of planetesimals. Yet, the conditions that result in bouncing are not very well understood. Existing simulations studying the bouncing behavior used aggregates with an artificial, very regular internal structure.AimsHere, we study the bouncing behavior of sub-mm dust aggregates that are constructed applying different sample preparation methods. We analyze how the internal structure of the aggregate alters the collisional outcome and we determine the influence of aggregate size, porosity, collision velocity, and impact parameter.MethodsWe use molecular dynamics simulations where the individual aggregates are treated as spheres that are made up of several hundred thousand individual monomers. The simulations are run on graphic cards (GPUs).ResultsStatistical bulk properties and thus bouncing behavior of sub-mm dust aggregates depend heavily on the preparation method. In particular, there is no unique relation between the average volume filling factor and the coordination number of the aggregate. Realistic aggregates bounce only if their volume filling factor exceeds 0.5 and collision velocities are below 0.1 ms-1.ConclusionsFor dust particles in the protoplanetary nebula we suggest that the bouncing barrier may not be such a strong handicap in the growth phase of dust agglomerates, at least in the size range of ≈100μm.
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DOI:
--
发表时间:
2009
期刊:
影响因子:
--
作者:
R. J. Geretshauser;R. Speith;C. Güttler;M. Krause;J. Blum
通讯作者:
J. Blum
DOI:
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发表时间:
2006
期刊:
影响因子:
--
作者:
Wada;K
通讯作者:
K
影响因子:
6.5
作者:
T. Jankowski;G. Wurm;T. Kelling;J. Teiser;W. Sabolo;P. J. Guti'errez;I. Bertini
通讯作者:
I. Bertini
DOI:
10.1088/0004-637x/742/1/5
发表时间:
2011
期刊:
The Astrophysical Journal
影响因子:
--
作者:
J. Teiser;Ilka Engelhardt;G. Wurm
通讯作者:
G. Wurm
DOI:
10.1086/525841
发表时间:
2007
期刊:
The Astrophysical Journal
影响因子:
--
作者:
Doreen Langkowski;J. Teiser;J. Blum
通讯作者:
J. Blum