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, the suppression of low strain rate non-premixed flames was investigated experimentally in a counterflow configuration for laminar flames with minimal conductive heat losses.
69 citations
TL;DR: In this paper, the authors investigated the flame suppression mechanism of alkali metal compounds and found that if the residence time in flames is less than the critical time, the inhibition effect of the powders will be purely thermal, especially for powders with larger diameters.
69 citations
TL;DR: In this article, an investigation by RANS modeling on diffusion flames of a CH4/H2 jet issuing into a hot and low-oxygen coflow from a burner system similar to that of Dally et al. is reported.
69 citations
TL;DR: In this article, the authors investigated the conversion rate of precursor panicles to carbonaceous soot aggregates in hydrocarbon diffusion flames, and the Arrhenius rate constants for the carbonization of precursor particles were derived.
Abstract: The presence of soot precursor particles in hydrocarbon diffusion flames is made clearly evident by means of contemporary sampling techniques in combination with transmission electron microscopy (TEM). These particles are the immediate predecessors of mature, partially dehydrogenated carbonaceous soot aggregates, and recent analytical tests indicate they contain a mixture of polycyclic aromatic hydrocarbons. In this work, the conversion rate of precursor panicles to carbonaceous soot aggregates is investigated. In one method the time interval for the morphological conversion of precursor particles to aggregates is observed in diluted diffusion flames. Temperature profiles are measured by rapid insertion thermocouple thermometry. This information is supplemented by the observation of the sudden decrease of the hydrogen mole fraction of soot precursor particles as measured by laser microprobe mass spectrometry. The Arrhenius rate constants for the carbonization of precursor particles are derived fr...
69 citations
TL;DR: In this article, particle formation of low vapor pressure species can be predicted if the source rates are known well enough, and both moment and sectional methods for particle formation have been applied and compared to the experimental measurements.
Abstract: Ceramic particle formation processes have been studied using SiO{sub 2} as a model compound. Silica particles have been synthesized in a counterpropagating diffusion flame reactor, in which in-situ measurements of particle size and number density have been made. In addition, the time-temperature history of the particle field has been calculated from a flame simulation. Numerical simulations using moment and sectional methods for particle formation have been applied and compared to the experimental measurements. The simulations for the particle formation assume a kinetically-constrained approach, allowing a simple representation of nucleation, surface growth and coagulation. The results suggest that, if the source rates are known well enough, particle formation of low vapor pressure species can be predicted. Both models do well in predicting the gross features of particle formation (number density and mean particle size), although the moment solution does a poor job of predicting the polydispersity effects during periods of high monomer generation rates.
69 citations