Publication Date:
2019-07-13
Description:
Measurement of sodium and OH concentrations in ten oxygen-rich H2/O2/N2 flames by respective saturated and low-power laser induced fluorescence techniques have permitted a detailed examination of the pronounced flame chemistry of sodium in such oxygen rich media. Previous interpretations have been shown to be largely incomplete or in error. The flame downstream profiles indicate that the amount of free sodium tracks the decay of H-atom and as the flame radicals decay sodium becomes increasingly bound in a molecular form. A detailed kinetic model indicates that the sodium is distributed between NaOH and NaO2 species. Concentrations of NaO are very small and NaH negligible. The actual distribution is controlled by the state of equilibrium of the flames' basic free radicals. Na, NaO2 and NaOH are all coupled to one another by fast reactions which can rapidly interconvert one to another as flame conditions vary. Above about 2000K, NaOH becomes dominant whereas NaO2 plays an increasingly important contribution at lower temperatures.
Keywords:
INORGANIC AND PHYSICAL CHEMISTRY
Type:
NASA-CR-169848
,
NAS 1.26:169848
,
WSCI-82-45
,
Fall Meeting of the Western States Sect. of the Combust. Inst.; Oct 11, 1982 - Oct 12, 1982; Livermore, CA; United States
Format:
application/pdf
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