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Wall effects of laminar hydrogen flames over platinum and inert surfaces
Author(s) -
Andrae Johan C. G.,
Björnbom Pehr H.
Publication year - 2000
Publication title -
aiche journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.958
H-Index - 167
eISSN - 1547-5905
pISSN - 0001-1541
DOI - 10.1002/aic.690460718
Subject(s) - laminar flow , boundary layer , combustion , inert , chemistry , hydrogen , mechanics , heat transfer , turbulence , thermal , thermodynamics , organic chemistry , physics
Abstract Different aspects of wall effects in the combustion of lean, laminar and stationary hydrogen flames in an axisymmetric boundary‐layer flow were studied using numerical simulations with the program CRESLAF. The importance of the chemical wall effects compared to thermal wall effects caused by heat transfer to a cold wall was investigated in the reaction zone by using different combustion systems at atmospheric pressure. Surface mechanisms include a catalytic surface, an inert surface that promotes radical recombinations, and a completely inert wall used as reference was the simplest possible boundary condition. The analysis of the results show that for the richer combustion case (ϕ = 0.5) the surface chemistry gives significant wall effects, while the thermal and velocity boundary layer gives rather small effects. But for the leaner combustion case (ϕ = 0.1) the thermal and velocity boundary layer gives more significant wall effects, while surface chemistry gives less significant wall effects compared to the other case. As expected, the overall wall effects were more pronounced for the leaner combustion case.