Homogeneous nucleation in supersaturated vapors of methane, ethane, and carbon dioxide predicted by brute force molecular dynamics.

نویسندگان

  • Martin Horsch
  • Jadran Vrabec
  • Martin Bernreuther
  • Sebastian Grottel
  • Guido Reina
  • Andrea Wix
  • Karlheinz Schaber
  • Hans Hasse
چکیده

Molecular dynamics (MD) simulation is applied to the condensation process of supersaturated vapors of methane, ethane, and carbon dioxide. Simulations of systems with up to a 10(6) particles were conducted with a massively parallel MD program. This leads to reliable statistics and makes nucleation rates down to the order of 10(30) m(-3) s(-1) accessible to the direct simulation approach. Simulation results are compared to the classical nucleation theory (CNT) as well as the modification of Laaksonen, Ford, and Kulmala (LFK) which introduces a size dependence of the specific surface energy. CNT describes the nucleation of ethane and carbon dioxide excellently over the entire studied temperature range, whereas LFK provides a better approach to methane at low temperatures.

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عنوان ژورنال:
  • The Journal of chemical physics

دوره 128 16  شماره 

صفحات  -

تاریخ انتشار 2008