Results 191 to 200 of about 186,702 (237)
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Flame holes and flame disks on the surface of a diffusion flame
Journal of Fluid Mechanics, 2004Flame holes and flame disks in a laminar axisymmetric counterflow configuration are numerically investigated for unity Lewis number, with the strain rate as the control parameter. The temporal evolution of the topological structure of flame holes and flame disks is described in detail for different representative strain rates.
Zhanbin Lu, Sandip Ghosal
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Fire Safety Journal, 1981
Nine classic diffusion flames, i.e., combustion systems with initially separate fuel and oxidizer, are synthesized in a search for common dimensionless parameters which may serve as indice of fire hazard. The problems examined are: planar and cylindrical Burke-Schumann; droplet burning; planar and cylindrical stagnant film; and forced, free, mixed, and
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Nine classic diffusion flames, i.e., combustion systems with initially separate fuel and oxidizer, are synthesized in a search for common dimensionless parameters which may serve as indice of fire hazard. The problems examined are: planar and cylindrical Burke-Schumann; droplet burning; planar and cylindrical stagnant film; and forced, free, mixed, and
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Diffusion flames and diffusion flame-streets in three dimensional micro-channels
Combustion and Flame, 2017Abstract Experiments of non-premixed combustion in micro-channels have exhibited different modes of burning. Typically, a diffusion flame is established along or near the axis of a channel spanning the entire mixing layer. It separates a region of fuel and no oxidiser from a region with only oxidiser. Often, however, a periodic sequence of extinction
Moshe Matalon, Shikhar Mohan
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Aerothermochemistry of Diffusion Flames
1983Soot formation in combustion zones concerns many scientific and technical fields, e.g.: flame pollution increase, in some applications, of the flame radiation due to soot formation, utilization of soot in some fabrications (“carbon black”).
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The Structure of Diffusion Flames
Combustion Science and Technology, 1976Abstract The theory for the mixing and chemical reaction of two streams of fluid is developed for unsteady laminar and for turbulent flow. Only one conserved scalar is required to fully describe the mixing and various reaction models are considered including the Burke-Schumann flame sheet and shifting equilibrium.
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On the extinction of diffusion flames
International Journal of Engineering Science, 1974Abstract Detailed analysis of diffusion flames involves the solution of a non-linear differential system. However, by approximating the reaction rate term in the thermodynamic equations by a Dirac delta function, the differential system becomes linear.
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Flame structures of H2S—Air diffusion flames
Symposium (International) on Combustion, 1981Diffusion flames of rich hydrogen sulfide-air mixtures were studied by the point to point temperature and comcentration profile method, measuring H 2 S, O 2 , N 2 , SO 2 , H 2 O and H 2 concentrations. Computation of overall reaction rates based on the values measured indicates that the flame is comprised of three distinct zones in which the ...
R. Delbourgo +2 more
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NEAR-LIMIT SPHERICAL DIFFUSION FLAMES AND COOL DIFFUSION FLAMES
2023To combat the rising threats of climate change, current combustion technologies must evolve to become cleaner and more efficient. This requires a better understanding of the fundamental properties of combustion. One way to gain this is through microgravity experiments, where the lack of buoyancy reduces flames to their most basic components ...
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TURBULENT JET DIFFUSION FLAMES
Progress in Energy and Combustion Science, 1976Publisher Summary This chapter discusses the turbulent jet diffusion flames of gaseous fuels. This system is simple compared to that in a diesel or gas turbine engine but nevertheless can throw much light on the mechanisms that are involved in the submodels used in describing the more complex systems.
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Flame structure of methane inverse diffusion flame
Experimental Thermal and Fluid Science, 2014Abstract This paper presents high speed images of OH-PLIF at 10 kHz simultaneously with 2D PIV (particle image velocimetry) measurements collected along the entire length of an inverse diffusion flame with circumferentially arranged methane fuel jets.
William L. Roberts +2 more
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