Kinetic simulation of the non-equilibrium effects at the liquid-vapor interface

A. Ph Polikarpov, I. A. Graur, E. Ya Gatapova, O. A. Kabov

Research output: Contribution to journalArticlepeer-review

11 Citations (Scopus)


Phase change phenomena at microscale is important for novel cooling microsystems with intensive evaporation, so the development of reliable models and simulations are challenging. The vapor behaviors near its condensed phase are simulated using the non-linear S-model kinetic equation. The pressure and temperature jumps obtained numerically are in good agreement with the analytical expressions derived from the appropriate Onsager-Casimir reciprocity relations. The results of the evaporation flux are close to those given by the Hertz-Knudsen-Schrage formula, only when the values of the pressure and temperature at the upper boundary of the Knudsen layer are used. Comparison with recently measured temperature jumps are provided and disagreement with some experiments are discussed.

Original languageEnglish
Pages (from-to)449-456
Number of pages8
JournalInternational Journal of Heat and Mass Transfer
Publication statusPublished - Jun 2019
Externally publishedYes


  • Evaporation rate
  • Knudsen layer
  • Liquid-vapor interface
  • Molecular mean free path
  • Non-equilibrium state
  • Temperature and pressure jumps


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