Kinetic nucleation model for free-expanding water condensation plume simulations

Zheng Li, Jiaqiang Zhong, Deborah A. Levin, Barbara Jane Garrison

Research output: Contribution to journalConference articlepeer-review

3 Scopus citations

Abstract

The direct simulation Monte Carlo (DSMC), a kinetic method, was recently expanded to include the simulation of homogeneous condensation in the free expansion of water plumes and the results show that the nucleation rate is a key factor to accurately modeling of condensation phenomenon. In this work, we assumed the bimolecular formation as the main microscopic mechanisms of water dimer formation and the formation probabilities through collision between two water molecules for different collision energies were obtained by MD simulations and found to decrease with collision energy. The formation probabilities and post-collisional velocity and energy distributions were then integrated into DSMC simulations of a free expansion of an orifice condensation plume with different chamber stagnation temperatures. The dimer mole fraction increases with distance from the orifice and becomes constant after a distance of about two orifice diameters. The terminal dimer mole fraction was found to decrease with chamber stagnation temperatures but higher than experimentally observed.

Original languageEnglish (US)
Pages (from-to)613-618
Number of pages6
JournalAIP Conference Proceedings
Volume1084
StatePublished - Apr 13 2009
Event26th International Symposium on Rarefied Gas Dynamics, RGD26 - Kyoto, Japan
Duration: Jul 20 2008Jul 25 2008

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy(all)

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