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 language | English (US) |
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Pages (from-to) | 613-618 |
Number of pages | 6 |
Journal | AIP Conference Proceedings |
Volume | 1084 |
State | Published - 2009 |
Event | 26th International Symposium on Rarefied Gas Dynamics, RGD26 - Kyoto, Japan Duration: Jul 20 2008 → Jul 25 2008 |
All Science Journal Classification (ASJC) codes
- General Physics and Astronomy