Stagnant-film combustion of an absorbing-emitting gas

✍ Scribed by C.M. Kinoshita

• Publisher: Elsevier Science
• Year: 1981
• Tongue: English
• Weight: 891 KB
• Volume: 43
• Category: Article
• ISSN: 0010-2180
• DOI: 10.1016/0010-2180(81)90028-6

✦ Synopsis

Steady, diffusion-controlled combustion of an absorbing-emitting gas in a one-dimensional stagnant film is analyzed. Shvab-Zeldovich variables, the flame-sheet approximation, and the radiative equation of transfer are used to compute numerically temperature and species profiles to obtain heat and mass transfer rates for a gray medium with uniform absorption coefficient.

For film optical depths greater than 0.1, gaseous radiation accounts for a substantial portion of the overall energy feedback to the fuel surface, and may exceed the conduction heat transfer by an order of magnitude. An optically thin solution is also considered which yields reasonable agreement with the complete analysis for optical depths below 0.1. Gaseous radiation may often be completely neglected for conditions in which the optically thin approximation is valid. A simple, flame-sheet radiation approximation which drastically reduces the numerical computations required to obtain a radiative solution is also discussed.