Heat transport analysis for femtosecond laser ablation with molecular dynamics-two temperature model method

Yuichiro Yamashita, Takehiko Yokomine, Shinji Ebara, Akihiko Shimizu

研究成果: Conference article査読

26 被引用数 (Scopus)

抄録

The phenomena of femtosecond (fs) laser ablation, such as heat transfer mechanism and shock wave propagation, are investigated by using modified molecular dynamics (MMD). In MMD, conventional molecular dynamics and the two-temperature model, which can describe both electron heat conduction and thermal non-equilibrium state between electron and atom, are coupled by employing the relationship between atom kinetic energy and lattice temperature. For TTM, the heat capacity and thermal conductivity of electrons are dependent on atom and electron temperatures. Two boundary conditions are prepared in order to investigate the effect. In case A, a heat bath is expanded to macro-scale by using a finite difference method whose governing equation is a two-temperature model. In case B, a normal heat bath is set at the bottom of the MD region, resulting in relaxation time with a reasonable value and speed of thermal shock wave equal to elastic wave. Finally, we conclude that the dominant heat transport mechanism is electron heat conduction within several picoseconds, after which thermal shock wave and ordinary heat conduction becomes dominant.

本文言語English
ページ(範囲)1695-1700
ページ数6
ジャーナルFusion Engineering and Design
81
8-14 PART B
DOI
出版ステータスPublished - 2006 2月
外部発表はい
イベントProceedings of the Seventh International Symposium on Fusion Nuclear Technology ISFNT-7 Part B -
継続期間: 2005 5月 222005 5月 27

ASJC Scopus subject areas

  • 土木構造工学
  • 原子力エネルギーおよび原子力工学
  • 材料科学(全般)
  • 機械工学

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