Hysteresis in stabilization of methane diffusion flames with plasmas

ABSTRACTMultiphoton ionization time-of-flight mass spectrosocopy is used as an on-line technique to investigate polycyclic aromatic hydrocarbons (PAH) and fullerenes in atmospheric pressure flames. We have recorded height profiles of neutral PAH and fullerenes in methane/argon diffusion flames. Fullerenes ranging from C32 to at least C150 are found in a region where PAH concentration starts to decrease. Uniformity of the profiles indicates that the fullerenes do not grow from smaller to larger ones. The influence of the amount of argon additive is discussed.

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Separation of heat transfer components from impinging methane diffusion flames

International Journal of Heat and Mass Transfer ◽

10.1016/j.ijheatmasstransfer.2018.05.014 ◽

2018 ◽

Vol 126 ◽

pp. 123-138 ◽

Cited By ~ 4

Author(s):

Vinay C. Raj ◽

Pramod Kuntikana ◽

S. Sreedhara ◽

S.V. Prabhu

Keyword(s):

Heat Transfer ◽

Diffusion Flames ◽

Methane Diffusion

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Experimental and detailed kinetic modeling study of PAH formation in laminar co-flow methane diffusion flames

Proceedings of the Combustion Institute ◽

10.1016/j.proci.2012.05.085 ◽

2013 ◽

Vol 34 (1) ◽

pp. 1811-1818 ◽

Cited By ~ 25

Author(s):

Alberto Cuoci ◽

Alessio Frassoldati ◽

Tiziano Faravelli ◽

Hanfeng Jin ◽

Yizun Wang ◽

...

Keyword(s):

Kinetic Modeling ◽

Diffusion Flames ◽

Methane Diffusion ◽

Modeling Study

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Enhanced Synthesis of Carbon Nanomaterials Using Acoustically Excited Methane Diffusion Flames

Materials ◽

10.3390/ma8084805 ◽

2015 ◽

Vol 8 (8) ◽

pp. 4805-4816 ◽

Cited By ~ 7

Author(s):

Shuhn-Shyurng Hou ◽

Kuan-Ming Chen ◽

Zong-Yun Yang ◽

Ta-Hui Lin

Keyword(s):

Carbon Nanomaterials ◽

Diffusion Flames ◽

Methane Diffusion

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Numerical Analysis of Hydrogen-Methane Diffusion Flames. Effects of Preferential Diffusion.

TRANSACTIONS OF THE JAPAN SOCIETY OF MECHANICAL ENGINEERS Series B ◽

10.1299/kikaib.59.607 ◽

1993 ◽

Vol 59 (558) ◽

pp. 607-612 ◽

Cited By ~ 1

Author(s):

Toshimi Takagi ◽

Xu Zhe

Keyword(s):

Numerical Analysis ◽

Diffusion Flames ◽

Preferential Diffusion ◽

Methane Diffusion

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Species Concentrations and Turbulence Properties in Buoyant Methane Diffusion Flames

Journal of Heat Transfer ◽

10.1115/1.3246744 ◽

1984 ◽

Vol 106 (4) ◽

pp. 721-727 ◽

Cited By ~ 39

Author(s):

S-M. Jeng ◽

G. M. Faeth

Keyword(s):

Turbulence Model ◽

Diffusion Flames ◽

Reynolds Stresses ◽

Methane Diffusion ◽

Scalar Properties ◽

Empirical Constants ◽

Laminar Flamelet

Past measurements of mean velocities and temperatures in buoyant turbulent, axisymmetric methane diffusion flames burning in still air have been extended to include mean species concentrations (CH4, N2, O2, CO2, H2O, CO, and H2) and turbulence quantities. The new measurements were used to evaluate a Favre-averaged, k-ε-g turbulence model of the process—with all empirical constants fixed by measurements in noncombusting flows. Use of the laminar flamelet method to treat scalar properties yielded reasonably good predictions of mean properties. Turbulence predictions were less satisfactory, generally underestimating fluctuation levels and Reynolds stresses in highly buoyant regions of the flows. Measurements indicated significant anisotropy of turbulence properties in the same regions. These findings suggest the need for multistress closure to adequately model turbulence properties in buoyant flames.

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