Topic
Diffusion flame
About: Diffusion flame is a research topic. Over the lifetime, 9266 publications have been published within this topic receiving 233522 citations.
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TL;DR: In this paper, straight and bamboo-like carbon nanotubes were synthesized in a methane diffusion flame using a Ni-Cr-Fe wire as a substrate and the catalyst particles were nickel and iron oxides formed on the wire surface inside the flame.
82 citations
TL;DR: In this paper, a modified Richardson number is proposed as a criterion for laminar-turbulent transition stability in free boundary layers, and experiments were carried out in three systems.
82 citations
TL;DR: In this paper, a spontaneous Raman scattering apparatus based on a flashlamp-pumped dye laser has been developed for single-pulse temperature and concentration measurements of very high accuracy.
Abstract: A spontaneous Raman scattering apparatus based on a flashlamp-pumped dye laser has been developed for single-pulse temperature and concentration measurements of very high accuracy. Comprehensive data sets from measurements in two turbulent H2/ N2/ air jet diffusion flames are presented comprising mean values and fluctuations of the temperature and major species concentrations. Differences in the behaviour of an attached and lifted flame, operated under identical flow conditions and fuel composition, are shown. The effect of differential diffusion and its dependence on flow velocity are investigated in detail. One of the main aims of this work is the establishment of data sets which are suitable for testing mathematical flame models. As an example, the experimental results from one flame are compared to theoretical predictions from a Reynolds-Stress model.
82 citations
01 Jan 1991
TL;DR: In this paper, the structure and extinction of diffusion flames with flame radiation was studied via multi-scale activation energy asymptotics, and it was shown that radiative heat loss promotes flame extinction in general, as expected.
Abstract: Using droplet combustion as a model problem, and capitalizing on the temperature-sensitive nature of radiative heat transfer, the structure and extinction of diffusion flames with flame radiation is studied via multi-scale activation energy asymptotics. The flame structure analyzed consists of an O(∈) reaction zone embedded within an O(δ) radiation zone which in turn is situated in the O(1) diffusive-convective flow field, where ∈≪δ≪1. The analysis yields the structure equation for the reaction zone, which can be cast in the same form as that of Linan's adiabatic diffusion flame problem such that his extinction results can be readily used. Present results show that radiative heat loss promotes flame extinction in general, as expected. Furthermore, it can also lead to the phenomenon of dual extinction turning points in which flame extinction due to reactant leakage and thereby kinetic limitation occurs not only for sufficiently small droplets, as is well established, but also for sufficiently large droplets as a result of excessive heat loss from the correspondingly large flame. Consequently there exist diffusive-reactive-radiative systems for which steady combustion is not possible for all droplet sizes. An estimation of the dimensional radiative extinction droplet size is also given for the sample system studied.
82 citations
TL;DR: In this article, the authors investigated the effects of hydrodynamics on the formation of soot and nitrogen oxides in counterflow diffusion flames fed with propane by imposing harmonic oscillations on the strain rate of the flames.
82 citations