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Mobility size and mass of nascent soot particles in a benchmark premixed ethylene flame

Journal Article · · Combustion and Flame

The burner stabilized stagnation flame technique coupled with micro-orifice probe sampling and mobility sizing has evolved into a useful tool for examining the evolution of the particle size distribution of nascent soot in laminar premixed flames. Several key aspects of this technique are examined through a multi-university collaborative study that involves both experimental measurement and computational modeling. Key issues examined include (a) data reproducibility and facility effects using four burners of different sizes and makers over three different facilities, (b) the mobility diameter and particle mass relationship, and (c) the degree to which the finite orifice flow rate affects the validity of the boundary condition in a pseudo one dimensional stagnation flow flame formulation. The results indicate that different burners across facilities yield nearly identical results after special attention is paid to a range of experimental details, including a proper selection of the sample dilution ratio and quantification of the experimental flame boundary conditions. The mobility size and mass relationship probed by tandem mass and mobility measurement shows that nascent soot with mobility diameter as small as 15 nm can deviate drastically from the spherical shape. Various non-spherical morphology models using a mass density value of 1.5 g/cm3 can reconcile this discrepancy in nascent soot mass. Lastly, two-dimensional axisymmetric simulations of the experimental flame with and without the sample orifice flow reveal several problems of the pseudo one-dimensional stagnation flow flame approximation. The effect of the orifice flow on the flame and soot sampled, although small, is not negligible. Particular suggestions are provided as to how to treat the non-ideality of the experimental setup in experiment and model comparisons.

Research Organization:
Energy Frontier Research Centers (EFRC) (United States). Combustion Energy Frontier Research Center (CEFRC)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22); National Natural Science Foundation of China (NSFC)
Grant/Contract Number:
SC0001198
OSTI ID:
1369837
Alternate ID(s):
OSTI ID: 1247774
Journal Information:
Combustion and Flame, Journal Name: Combustion and Flame Journal Issue: 10 Vol. 162; ISSN 0010-2180
Publisher:
ElsevierCopyright Statement
Country of Publication:
United States
Language:
English

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Cited By (8)

Flame-formed carbon nanoparticles exhibit quantum dot behaviors journal June 2019
Investigation of the size of the incandescent incipient soot particles in premixed sooting and nucleation flames of n -butane using LII, HIM, and 1 nm-SMPS journal May 2017
Understanding soot particle size evolution in laminar ethylene/air diffusion flames using novel soot coalescence models journal June 2016
Characterization of the state of nanoparticle aggregation in non-equilibrium plasma synthesis systems journal July 2018
Challenges of measuring nascent soot in flames as evidenced by high-resolution differential mobility analysis text January 2016
Challenges of measuring nascent soot in flames as evidenced by high-resolution differential mobility analysis text January 2016
Investigation of the size of the incandescent incipient soot particles in premixed sooting and nucleation flames of n-butane using LII, HIM, and 1 nm-SMPS text January 2017
Investigation of the size of the incandescent incipient soot particles in premixed sooting and nucleation flames of n-butane using LII, HIM, and 1 nm-SMPS text January 2017

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