文章基本信息

标题：Thermal conductivity of porous aggregates
本地全文：下载
作者：Sota Arakawa ; Hidekazu Tanaka ; Akimasa Kataoka 等
期刊名称：Astronomy & Astrophysics
印刷版ISSN：0004-6361
电子版ISSN：1432-0746
出版年度：2017
卷号：608
页码：1-4
DOI：10.1051/0004-6361/201732182
语种：English
出版社：EDP Sciences
摘要：Context.The thermal conductivity of highly porous dust aggregates is a key parameter for many subjects in planetary science; it is not yet fully understood, however.Aims.We investigate the thermal conductivity of fluffy dust aggregates with filling factors lower than10-1.Methods.We determined the temperature structure and heat flux of the porous dust aggregates calculated throughN-body simulations of static compression in the periodic boundary condition.Results.We 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.
关键词：enconductionradiative transfercomets: generalmeteorites, meteors, meteoroids