Thermal conductivity of porous aggregates

Thermal conductivity of porous aggregates
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多孔骨料的导热系数

DOI:
10.1051/0004-6361/201732182
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发表时间:
2017
影响因子:
6.5
通讯作者:
Nakamoto Taishi
Nakamoto Taishi
中科院分区:
物理与天体物理2区
文献类型:
--
作者:
Arakawa Sota;Tanaka Hidekazu;Kataoka Akimasa;Nakamoto Taishi

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目的研究填充因子小于10-1的蓬松尘粒的导热系数。方法在周期性边界条件下,通过静态压缩的N体模拟,确定了多孔尘粒的温度结构和热流密度。结果得到了固体网络中尘粒热导率与填充因子φ的关系的经验公式。结果表明,ksol2与φ2近似成正比,通过固体网络的导热系数明显低于先前的假设。鉴于这些发现,我们必须重新考虑小型行星体的热历史。
ContextThe thermal conductivity of highly porous dust aggregates is a key parameter for many subjects in planetary science; it is not yet fully understood, however.AimsWe investigate the thermal conductivity of fluffy dust aggregates with filling factors lower than 10-1.MethodsWe determined the temperature structure and heat flux of the porous dust aggregates calculated throughN-body simulations of static compression in the periodic boundary condition.ResultsWe derive an empirical formula for the thermal conductivity through the solid networkksolas a function of the filling factor of dust aggregatesφ. The results reveal thatksolis approximately proportional toφ2, and the thermal conductivity through the solid network is significantly lower than previously assumed. In light of these findings, we must reconsider the thermal histories of small planetary bodies.
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