Pressure dependence of primary soot particle size determined using thermophoretic sampling in laminar methane-air diffusion flames

Vargas, Alex M.; Gülder, Ömer L.

doi:10.1016/j.proci.2016.05.023

Cited by 31 publications

(16 citation statements)

References 42 publications

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“…̅̅̅ increases with pressure up to 4 atm and changing pressure from 4 to 5 atm, does not change ̅̅̅ significantly. These trends are consistent with the ones obtained from ethylene flames (Gigone et al, 2019, Steinmetz et al, 2016 but contradicts with the pressurized flames of methane (Vargas and Gülder, 2016).…”

Section: Resultssupporting

confidence: 87%

Investigating Soot Parameters in an Ethane/Air Counterflow Diffusion Flame at Elevated Pressures

Amin

Roberts

2020

Combustion Science and Technology

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Soot emissions from diesel engines and gas turbines are influenced by the combustion environment. Pressure is one of the parameters which affects particulate emissions and these effects are poorly understood on soot parameters. In this work, pressurized counterflow diffusion flame of ethane and air has been investigated using two angle light scattering and extinction technique. A counterflow diffusion flame has been stabilized from 2 to 5 atm in a pressure vessel which can provide optical access from 10 to 165° in angular direction. Global strain rate (a) of 30 s-1 is maintained at all pressures by adjusting the inlet flows. Scattering measurements are performed at two angles (45° and 135°) and Rayleigh-Debye-Gans theory for Fractal Aggregates (RDG-FA) has been used to determine soot parameters from light scattering and extinction data. By combining the scattering at 135° with laser extinction measurements, path averaged soot volume fraction (fv), mean primary particle diameter (̅̅̅) and particle number densities (np), along the axis of the counterflow flame are calculated. Local soot volume fraction (fv,local) profiles are also measured using diffuse light 2D line of sight attenuation technique. Peak value of fv increases from 0.3 ppm to 8 ppm as the pressure is raised from 2 to 5 atm. Primary particle size (̅̅̅) also increases with pressure where peak primary particle size of 11 nm at 2 atm rises to 38 nm at 5 atm. Population average radius of gyration (Rg) increases with pressure while the number densities (np) of primary particles decrease due to coalescence.

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Section: Resultssupporting

confidence: 87%

Investigating Soot Parameters in an Ethane/Air Counterflow Diffusion Flame at Elevated Pressures

Amin

Roberts

2020

Combustion Science and Technology

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“…However, experimental studies on SVF have shown that decreasing ambient oxygen [58] and increasing ambient density [62] can increase SVF in diesel spray flame. In addition, measurement of primary soot size in canonical flame setups also showed similar findings regarding the effect of oxygen [63] and ambient density [64][65][66] on primary soot sizes.…”

Section: Primary Soot Size Distributionsupporting

confidence: 64%

Effects of Ambient Oxygen and Density on Primary Soot Size under Diesel-Like Conditions Using a Lagrangian Soot Tracking Model

Ong¹,

Pang²,

Walther³

et al. 2021

SAE Int. J. Engines

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“…Thermophoretic sampling followed by transmission electron microscopy (TEM) analysis is an intrusive diagnostic that has been commonly used at atmospheric conditions but rarely performed in pressurized flames. Recently, Vargas et al [11] designed and built a high pressure thermophoretic sampling system to investigate soot primary particle size using thermophoretic sampling and TEM analysis in a methane air coflow diffusion flame. They reported a decrease of the primary particle size by 35%, as the pressure was increased from 2 to 10 atm.…”

Section: Introductionmentioning

confidence: 99%

Determining fractal properties of soot aggregates and primary particle size distribution in counterflow flames up to 10 atm

Amin

Bennett

Roberts

2019

Proceedings of the Combustion Institute

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Pressure dependence of primary soot particle size determined using thermophoretic sampling in laminar methane-air diffusion flames

Cited by 31 publications

References 42 publications

Investigating Soot Parameters in an Ethane/Air Counterflow Diffusion Flame at Elevated Pressures

Investigating Soot Parameters in an Ethane/Air Counterflow Diffusion Flame at Elevated Pressures

Effects of Ambient Oxygen and Density on Primary Soot Size under Diesel-Like Conditions Using a Lagrangian Soot Tracking Model

Determining fractal properties of soot aggregates and primary particle size distribution in counterflow flames up to 10 atm

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Pressure dependence of primary soot particle size determined using thermophoretic sampling in laminar methane-air diffusion flames

Cited by 31 publications

References 42 publications

Investigating Soot Parameters in an Ethane/Air Counterflow Diffusion Flame at Elevated Pressures

Investigating Soot Parameters in an Ethane/Air Counterflow Diffusion Flame at Elevated Pressures

Effects of Ambient Oxygen and Density on Primary Soot Size under Diesel-Like Conditions Using a Lagrangian Soot Tracking Model

Determining fractal properties of soot aggregates and primary particle size distribution in counterflow flames up to 10 atm

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Determining fractal properties of soot aggregates and primary particle size distribution in counterflow flames up to 10 atm