Publication: Thermal Accommodation Coefficients between Polyatomic Gas Molecules and Soot in Laser-Induced Incandescence Experiments
All || By Area || By Year| Title | Thermal Accommodation Coefficients between Polyatomic Gas Molecules and Soot in Laser-Induced Incandescence Experiments | Authors/Editors* | K. J. Daun |
|---|---|
| Where published* | International Journal of Heat and Mass Transfer |
| How published* | Journal |
| Year* | 2009 |
| Volume | |
| Number | |
| Pages | |
| Publisher | |
| Keywords | |
| Link | doi:10.1016/j.ijheatmasstransfer.2009.05.006 |
| Abstract |
Time-resolved laser-induced incandescence demands detailed knowledge of the thermal accommodation coefficient, but to date little is understood about the gas/surface scattering physics underlying this parameter in LII experiments. This paper presents a molecular dynamics (MD) simulation that models polyatomic molecules as rigid rotors and soot as crystalline graphite. A Monte Carlo integration over incident gas molecular speeds and surface atomic vibrational phases yields simulated thermal accommodation coefficients that match the experimentally-measured values. The MD simulation is then extended to assess how α changes with gas and soot temperature, and finally to define a CercignaniâLampisâLord scattering kernel that will form a boundary condition in future Monte Carlo simulations of heat and mass transfer between soot aggregates and the surrounding gas. |
Back to page 39 of list