RADICAL QUENCHING OF METHANE-AIR PREMIXED FLAME IN MICROREACTORS USING DETAILED CHEMICAL KINETICS
The steady hetero-/homogeneous combustion of lean methane-air mixtures in plane channel-flow microreactors was investigated numerically to elucidate the effects of wall material and initial sticking coefficient on radical quenching. Simulations were performed with a two-dimensional numerical model e...
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| Main Authors: | , |
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| Format: | Article |
| Language: | English |
| Published: |
Alma Mater Publishing House "Vasile Alecsandri" University of Bacau
2015-10-01
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| Series: | Scientific Study & Research: Chemistry & Chemical Engineering, Biotechnology, Food Industry |
| Subjects: | |
| Online Access: | http://pubs.ub.ro/?pg=revues&rev=cscc6&num=201503&vol=3&aid=4298 |
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| Summary: | The steady hetero-/homogeneous combustion of lean methane-air mixtures in plane channel-flow microreactors was investigated numerically to elucidate the effects of wall material and initial sticking coefficient on radical quenching. Simulations were performed with a two-dimensional numerical model employing detailed reaction mechanisms to examine the interaction between heterogeneous and homogeneous reactions on platinum, alumina, quartz and copper. Comparisons among wall materials revealed that the wall chemical effect plays a vital role in the distribution of OH* radical. Homogeneous reaction of methane over platinum is significantly inhibited due to the rapid depletion of reactants on catalytic surfaces, rather than the radical adsorption. The inhibition of radical quenching on the surface of alumina is most pronounced. As the microreactor is smaller than the critical dimension of 0.7 mm, the wall chemical effect on flame characteristics becomes of great importance. |
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| ISSN: | 1582-540X 1582-540X |