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

Yuichiro Yamashita, Takehiko Yokomine, Shinji Ebara, Akihiko Shimizu

Research output: Contribution to journalConference articlepeer-review

22 Citations (Scopus)

Abstract

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.

Original languageEnglish
Pages (from-to)1695-1700
Number of pages6
JournalFusion Engineering and Design
Volume81
Issue number8-14 PART B
DOIs
Publication statusPublished - 2006 Feb
Externally publishedYes
EventProceedings of the Seventh International Symposium on Fusion Nuclear Technology ISFNT-7 Part B -
Duration: 2005 May 222005 May 27

Keywords

  • Heat transport mechanism
  • Laser ablation
  • Modified molecular dynamics
  • Two-temperature model

ASJC Scopus subject areas

  • Civil and Structural Engineering
  • Nuclear Energy and Engineering
  • Materials Science(all)
  • Mechanical Engineering

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