Comment on “Laser-induced fluorescence diagnostics and chemical kinetic modeling of a CH4/NO2/O2 flame at 55 torr” by S. Zabarnick
✍ Scribed by Bradley A. Williams; James W. Fleming; Steven Zabarnick
- Publisher
- Elsevier Science
- Year
- 1994
- Tongue
- English
- Weight
- 185 KB
- Volume
- 98
- Category
- Article
- ISSN
- 0010-2180
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✦ Synopsis
In Ref. 1, Zabarnick compared experimental concentration profiles of intermediate species measured by laser-induced fluorescence (LIF) in a CH4/NO2/O 2 flame with predictions of kinetic models. He was unable to obtain good ~t between the calculation and experi-or~nt, particularly in that the calculation predie profiles of all observed species to lie millimeters too far above the burner. It w~ concluded that the model used did not adequately describe the global kinetics of the NO 2 based flames. More recently, Williams and b"k~ing compared intermediate species for a series of CH4/O2/NO2/N 2 flames containing various proportions of Oz and NO2 [2].
Contrary to Zabarnick's conclusion, they found very good agreement between calculation and experiment using almost the same kinetic mechanism. In calibrating the flow rates of the r~ Ilases, the authors of Ref. 2 found that "the published calibration factor for NO 2 for e~ flow controllers was in error by a factor of 4 near room temperature due to the contribution of NO 2 dimerization to its heat capacity. In Ref. 1 the nominal calibration factor of the flow controller was used. We have modeled Zabarnick's conditions using the measured flowmeter calibration for NOz used in Ref. 2 to see whether the discrepancies be-*Corresponding author.