Thermal conductivity of porous aggregates

被引：18

作者：

Arakawa, Sota ^{[1
]}

Tanaka, Hidekazu ^{[2
]}

Kataoka, Akimasa ^{[3
]}

Nakamoto, Taishi ^{[1
]}

机构：

[1] Tokyo Inst Technol, Dept Earth & Planetary Sci, Meguro Ku, Tokyo 1528551, Japan

[2] Tohoku Univ, Astron Inst, Aoba Ku, Sendai, Miyagi 9808578, Japan

[3] Natl Astron Observ Japan, Div Theoret Astron, Mitaka, Tokyo 1818588, Japan

来源：

ASTRONOMY & ASTROPHYSICS | 2017年 / 608卷

关键词：

conduction; radiative transfer; comets: general; meteorites; meteors; meteoroids; NUMERICAL-SIMULATION; CONDUCTANCE; ACCRETION; CONTACT; MODEL;

D O I：

10.1051/0004-6361/201732182

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

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 than 10(-1). Methods. We determined the temperature structure and heat flux of the porous dust aggregates calculated through N-body simulations of static compression in the periodic boundary condition. Results. We derive an empirical formula for the thermal conductivity through the solid network k(sol) as a function of the filling factor of dust aggregates phi. The results reveal that ksol is approximately proportional to phi(2), 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.

引用

页数：4

共 31 条

[1]

ARAKAWA S, 2017, APJ, V846, DOI DOI 10.3847/1538-4357/AA8564

[2] ROCKY PLANETESIMAL FORMATION VIA FLUFFY AGGREGATES OF NANOGRAINS [J].