TY - JOUR
T1 - Quantitative measurement of particle size distributions of carbonaceous nanoparticles during ethylene pyrolysis in a laminar flow reactor
AU - Mei, Junyu
AU - Wang, Mengda
AU - You, Xiaoqing
AU - Law, Chung K.
N1 - Funding Information:
This work was supported by the National Science Foundation of China ( 91541122 and 51761125012 ).
PY - 2019/2
Y1 - 2019/2
N2 - Evolution of the particle size distributions (PSDs) for carbonaceous nanoparticles formed from ethylene pyrolysis in a laminar flow reactor was quantitatively measured by a scanning mobility particle sizer coupled with the small orifice sampling technique. The sampling dilution ratio was calibrated and determined to eliminate effects of particle loss in the sampling line. Investigation of various possible effects on the PSDs indicates that while the PSDs are very sensitive to the inlet flow rate, they are not much affected by the probe location and the sampling delay time within operating errors. The evolution of PSDs was determined by varying the inlet flow rates and compared for different ethylene concentrations (0.4 vol%, 0.6 vol%, and 0.8 vol%) and different tube temperatures (1573 K, 1673 K, and 1773 K). A distinct bimodal distribution was observed under fuel pyrolysis conditions. An increase of fuel concentration led to slightly earlier particle inception and a notable increase of particles yield, while temperature variation severely affected the rates of nucleation and mass growth. The particle induction delay times depended exponentially on the temperature, following the Arrhenius law.
AB - Evolution of the particle size distributions (PSDs) for carbonaceous nanoparticles formed from ethylene pyrolysis in a laminar flow reactor was quantitatively measured by a scanning mobility particle sizer coupled with the small orifice sampling technique. The sampling dilution ratio was calibrated and determined to eliminate effects of particle loss in the sampling line. Investigation of various possible effects on the PSDs indicates that while the PSDs are very sensitive to the inlet flow rate, they are not much affected by the probe location and the sampling delay time within operating errors. The evolution of PSDs was determined by varying the inlet flow rates and compared for different ethylene concentrations (0.4 vol%, 0.6 vol%, and 0.8 vol%) and different tube temperatures (1573 K, 1673 K, and 1773 K). A distinct bimodal distribution was observed under fuel pyrolysis conditions. An increase of fuel concentration led to slightly earlier particle inception and a notable increase of particles yield, while temperature variation severely affected the rates of nucleation and mass growth. The particle induction delay times depended exponentially on the temperature, following the Arrhenius law.
KW - Carbonaceous nanoparticle
KW - Laminar flow reactor
KW - PSDs
KW - Particle induction delay time
KW - SMPS
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U2 - 10.1016/j.combustflame.2018.11.010
DO - 10.1016/j.combustflame.2018.11.010
M3 - Article
AN - SCOPUS:85056811476
SN - 0010-2180
VL - 200
SP - 15
EP - 22
JO - Combustion and Flame
JF - Combustion and Flame
ER -