Planetesimals in rarefied gas: wind erosion in slip flow

Planetesimals in rarefied gas: wind erosion in slip flow
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稀薄气体中的星子:滑流中的风蚀

DOI:
10.1093/mnras/staa607
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发表时间:
2020
影响因子:
4.8
通讯作者:
G.Wurm
G.Wurm
中科院分区:
物理与天体物理2区
文献类型:
--
作者:
T. Demirci;N. Schneider;T. Steinpilz;T. Bogdan;J. Teiser;G.Wurm

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星子在其原行星盘的气体中移动,在那里它会遇到逆风。尽管环境压力较低,但如果气流足够强大,这种风就会侵蚀并最终摧毁星子。我们第一次在地面和微重力实验中在与原行星盘相关的压力下观察到风蚀,即低至。我们发现侵蚀所需的剪切应力取决于与表面颗粒相关的努森数。当颗粒变得与气体分子的平均自由程相当或更大时,引发侵蚀的临界剪切应力就会增加。这使得卵石堆星子在较低压力下更加稳定。然而,这并不能拯救它们,因为实验还表明,对于亚毫米尺寸的颗粒来说,引发侵蚀的临界剪切应力非常低。
A planetesimal moves through the gas of its protoplanetary disc where it experiences a head wind. Though the ambient pressure is low, this wind can erode and ultimately destroy the planetesimal if the flow is strong enough. For the first time, we observe wind erosion in ground-based and microgravity experiments at pressures relevant in protoplanetary discs, i.e. down to. We find that the required shear stress for erosion depends on the Knudsen number related to the grains at the surface. The critical shear stress to initiate erosion increases as particles become comparable to or larger than the mean free path of the gas molecules. This makes pebble pile planetesimals more stable at lower pressure. However, it does not save them as the experiments also show that the critical shear stress to initiate erosion is very low for sub-millimetre-sized grains.
DOI: --
发表时间: 2019
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