Optical diagnostics for determining gas temperature of reactive microdischarges in a methane-fed dielectric barrier discharge
| Autor: | Tomohiro Nozaki, Yasuko Unno, Ken Okazaki, Yuh Miyazaki |
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| Rok vydání: | 2001 |
| Předmět: |
Acoustics and Ultrasonics
Chemistry Enthalpy Analytical chemistry Rotational temperature Dielectric barrier discharge Condensed Matter Physics Temperature measurement Heat capacity Methane Surfaces Coatings and Films Electronic Optical and Magnetic Materials chemistry.chemical_compound Heat transfer Emission spectrum |
| Zdroj: | Journal of Physics D: Applied Physics. 34:2504-2511 |
| ISSN: | 1361-6463 0022-3727 |
| DOI: | 10.1088/0022-3727/34/16/316 |
| Popis: | The gas temperature of reactive microdischarges has been extensively investigated in a methane-fed dielectric barrier discharge (DBD) configured by a two parallel plate reactor with 0.5 mm gap spacing. Emission spectroscopy of the rotational bands of CH(2Δ→2Π) coupled with heat transfer experiments have been employed for this purpose. Stationary and space-averaged gas temperature between the discharge gap was estimated from the heat transfer experiment; thus heat capacity and enthalpy gained by the feed gas stream resulted in a ≈20 K temperature increase. The rotational temperature showed fairly good sensitivity to the inlet gas temperature variation in the range 370-670 K. However, the local gas temperature increase inside the microdischarges represented an additional 100 K above the average gas temperature, indicating one order of magnitude higher value than the theoretically expected gas temperature increase (5-10 K) for a single microdischarge. High-frequency operation (80 kHz) is responsible for memory effect, thus such a high gas temperature increase was the result of multiple microdischarges rather than a single one. |
| Databáze: | OpenAIRE |
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