A novel definition of the local and instantaneous liquid-vapor interface

Gota Kikugawa, Shu Takagi, Yoichiro Matsumoto

Research output: Chapter in Book/Report/Conference proceedingChapterpeer-review

1 Citation (Scopus)


In this paper, we present a new definition of liquid-vapor interface at the molecular level which can capture the local and instantaneous structure of the interface. The new definition is not a thermodynamic definition of the interface, such as the equimolar surface, but is based on the instantaneous particle density distribution of molecules. Applying the new definition of the interface to the MD result of the liquid-vapor interface, we found that our definition of the interface was able to capture the microscopic fluctuation caused by molecular motion. Furthermore, we confirmed that on the longtime average our definition of the interface shows good agreement with the equimolar surface.

Original languageEnglish
Title of host publicationIUTAM Symposium on Computational Approaches to Multiphase Flow
PublisherKluwer Academic Publishers
Number of pages10
ISBN (Print)9781402049767
Publication statusPublished - 2006

Publication series

NameFluid Mechanics and its Applications
ISSN (Print)0926-5112


  • Equimolar surface
  • Instantaneous interface
  • Level set method
  • Molecular dynamics


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