A new correlation between soot sheet width and soot volume fraction in turbulent non-premixed jet flames

Mahmoud, Saleh; Lau, Timothy C. W.; Nathan, Graham J.; Medwell, Paul R.; Alwahabi, Zeyad T.; Dally, Bassam B.

doi:10.1016/j.proci.2018.06.108

Cited by 7 publications

(9 citation statements)

References 23 publications

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“…To obtain true 𝜆 𝑆 , three-dimensionality needs to be accounted 13 for different 𝑅𝑒. These trends appear to follow the power fit, as also demonstrated by Mahmoud et al [16]. The authors compared the correlation between sheet thickness and 𝑓 𝑣 ; both averaged over a given soot sheet region.…”

Section: Soot Sheet Thicknessmentioning

confidence: 76%

“…Thus, the knowledge of soot sheet thickness (as a function of 𝑅𝑒) could provide insights into the effect of turbulence on soot formation and oxidation. Such length scale analysis has been reported by a few studies [1,16,60,61]. Motivated by the above reasons, 𝜆 𝑆 analysis is pursued.…”

Section: Soot Sheet Thicknessmentioning

confidence: 99%

“…Such difficulties are well recognized in Refs. [16,61]. Our data processing approach relies on the sequential protocol of image smoothing and binarization through the adaptive local threshold.…”

Section: Soot Sheet Thicknessmentioning

confidence: 99%

“…The total soot yield was observed to vary linearly with the nozzle diameter and fuel flow rate. In recent work [16], a global relationship (power-law trend) between soot sheet width (i.e., thickness) and soot concentration is reported. Time-resolved spatial correlations between the soot, PAH, and OH distributions were examined by Franzelli et al [17].…”

Section: Introductionmentioning

confidence: 99%

“…The international sooting flame workshop [27] has consolidated data from various groups (Sandia, DLR, Adelaide, TUDelft) to facilitate database access to the modeling community. In most of the works reported so far, ethylene [1,3,5,7,10] or ethylene-based mixtures [13][14][15][16]28] were used as a fuel. The choice of ethylene has been primarily motivated by the considerable soot yield, which enables accurate measurements.…”

Section: Introductionmentioning

confidence: 99%

See 4 more Smart Citations

Comprehensive characterization of sooting butane jet flames, Part 1: Soot, soot-precursor, and reaction zone

Mulla

Desgroux

Lecordier

et al. 2021

Combustion and Flame

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Section: Soot Sheet Thicknessmentioning

confidence: 76%

Section: Soot Sheet Thicknessmentioning

confidence: 99%

Section: Soot Sheet Thicknessmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Comprehensive characterization of sooting butane jet flames, Part 1: Soot, soot-precursor, and reaction zone

Mulla

Desgroux

Lecordier

et al. 2021

Combustion and Flame

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Soot sheet characteristics of turbulent diffusion fire using equivalent ellipse method

et al. 2023

Fire and Materials

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This paper investigates the soot sheet characteristics of buoyant turbulent fires using laser‐induced incandescence technique. Experiments are carried out for four fires using propane and nitrogen hybrid gases as fuel with propane fractions of 1.0–0.4. An equivalent ellipse method in previous literature was employed to evaluate soot sheet characteristics. The results show that soot sheet mainly exists in two kinds of morphology: one is small piece and the other is narrow and long piece. Both the probability density functions of the length and width of the equivalent ellipse and soot volume fraction of soot sheet are strongly dependent on height. In addition, the effect of propane fraction on the probability density functions is always opposite in the lower and middle part of the fires, while no obvious effect can be found in the upper part of the fires. Soot sheet number is found to increase with height except when propane fraction is 0.4. The total soot sheet number increases linearly with height within the scope of this paper.

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Laser-induced emission from iron oxide nanoparticles in spray-flame synthesis: in situ high-speed microscopy

Jüngst,

Suedholt,

Smallwood

et al. 2024

Appl. Phys. B

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Spray-flame synthesis uses low-cost precursors dissolved in organic solvents to produce functional metaloxide nanoparticles. In the spray flame, the precursor-laden droplets show frequent and intense thermally-induced disruption, so-called puffing and micro-explosion. This process is often correlated with high uniformity of particle sizes. Whether puffing and micro-explosion are also directly associated with the formation or release of iron oxide nanoparticles is not clear. Also, the spatiotemporal evolution of nanoparticles in the turbulent flow field of the flame is largely unknown from experiments. We performed simultaneous high-speed microscopic imaging of droplet shadowgraphs at 360 kHz as well as elastic light scattering (ELS) and laser-induced emission (LIE) of nanoparticles at 40 kHz. Comparing ELS and LIE images allows distinguishing signals from droplets, flame, and nanoparticles, as only the nanoparticles will appear in images from both methods. ELS and LIE show nanoparticles as thin narrow filaments, presumably following the local flow. Nanoparticle filaments are found at a height of 50 mm and more above the burner in the spray flame. The filaments show increasing LIE signal and higher confinement with increasing height above the burner. The appearance of LIE and thus nanoparticles does not directly correlate with the presence of droplets or their disruption.

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A new correlation between soot sheet width and soot volume fraction in turbulent non-premixed jet flames

Cited by 7 publications

References 23 publications

Comprehensive characterization of sooting butane jet flames, Part 1: Soot, soot-precursor, and reaction zone

Comprehensive characterization of sooting butane jet flames, Part 1: Soot, soot-precursor, and reaction zone

Soot sheet characteristics of turbulent diffusion fire using equivalent ellipse method

Laser-induced emission from iron oxide nanoparticles in spray-flame synthesis: in situ high-speed microscopy

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