A proof-of-concept study on characterization of primary particle size distribution and thermal accommodation coefficient of soot aggregate by using conduction-dominated laser-induced incandescence

2021 ◽  
Vol 141 ◽  
pp. 106572
Author(s):  
Jun-You Zhang ◽  
Hong Qi ◽  
Bao-Hai Gao ◽  
Ya-Tao Ren ◽  
Lei Zhou
Keyword(s):  
Particle Size ◽  
Primary Particle ◽  
Accommodation Coefficient ◽  
Primary Particle Size ◽  
Proof Of Concept ◽  
Thermal Accommodation ◽  
Soot Aggregate ◽  
Laser Induced Incandescence ◽  
Thermal Accommodation Coefficient

Investigation of Thermal Accommodation Coefficients in Time-Resolved Laser-Induced Incandescence

2008 ◽  
Vol 130 (12) ◽  
Author(s):  
K. J. Daun ◽  
G. J. Smallwood ◽  
F. Liu
Keyword(s):  
Particle Size ◽  
A Priori ◽  
Accommodation Coefficient ◽  
Particle Sizing ◽  
Time Resolved ◽  
Polyatomic Gases ◽  
Thermal Accommodation ◽  
Laser Induced Incandescence ◽  
Accommodation Coefficients ◽  
Thermal Accommodation Coefficient

Accurate particle sizing through time-resolved laser-induced incandescence (TR-LII) requires knowledge of the thermal accommodation coefficient, but the underlying physics of this parameter is poorly understood. If the particle size is known a priori, however, TR-LII data can instead be used to infer the thermal accommodation coefficient. Thermal accommodation coefficients measured between soot and different monatomic and polyatomic gases show that the accommodation coefficient increases with molecular mass for monatomic gases and is lower for polyatomic gases. This latter result indicates that surface energy is accommodated preferentially into translational modes over internal modes for these gases.

scholarly journals Measurement of Thermal Accommodation Coefficients Using Laser-Induced Incandescence

2007 ◽  
Author(s):  
K. J. Daun ◽  
P. H. Mercier ◽  
G. J. Smallwood ◽  
F. Liu ◽  
Y. Le Page
Keyword(s):  
Deformation Rate ◽  
Surface Deformation ◽  
Accommodation Coefficient ◽  
Polyatomic Gases ◽  
Thermal Accommodation ◽  
Laser Induced Incandescence ◽  
Translational Mode ◽  
Accommodation Coefficients ◽  
Thermal Accommodation Coefficient ◽  
Gas Molecules

Laser-induced incandescence (LII) is used to measure the thermal accommodation coefficient between soot sampled from a well-characterized flame and various monatomic and polyatomic gases. These measurements show that the thermal accommodation coefficient between soot and monatomic gases increases with molecular mass due to the decreasing speed of incident gas molecules and corresponding decrease in surface deformation rate, and that energy is transferred preferentially from the surface to the translational mode of the polyatomic gas molecules over internal energy modes.

Can soot primary particle size be determined using laser-induced incandescence?

1999 ◽  
Vol 116 (1-2) ◽  
pp. 291-296 ◽  
Author(s):  
Randy L. Vander Wal ◽  
Thomas M. Ticich ◽  
A. Brock Stephens
Keyword(s):  
Particle Size ◽  
Primary Particle ◽  
Primary Particle Size ◽  
Laser Induced Incandescence

Thermal Accommodation Coefficients for Time-Resolved Laser-Induced Incandescence Sizing of Metal Nanoparticles in Monotomic Gases

2012 ◽  
Author(s):  
T. A. Sipkens ◽  
K. J. Daun ◽  
J. T. Titantah ◽  
M. Karttunen
Keyword(s):  
Metal Nanoparticles ◽  
Accommodation Coefficient ◽  
Time Resolved ◽  
Thermal Accommodation ◽  
Fundamental Relationship ◽  
Laser Induced Incandescence ◽  
Accommodation Coefficients ◽  
Thermal Accommodation Coefficient ◽  
Molybdenum Nanoparticles ◽  
First Time

There is recent interest in adapting time-resolved laser-induced incandescence (TiRE-LII) to measure aerosolized metal nanoparticles, which requires knowledge of the thermal accommodation coefficient between the gas and the laser-energized particle. This paper presents accommodation coefficients for various metal particles in monatomic gases derived using molecular dynamics (MD). A comparative analysis of different gas/metal systems reveals a fundamental relationship between the thermal accommodation coefficient and the potential well depth. Finally, MD derived accommodation coefficients are used, for the first time, to recover particle sizes from TiRe-LII measurements made on molybdenum nanoparticles in helium and argon atmospheres.

Molecular Dynamics Simulation of Thermal Accommodation Coefficients for Laser-Induced Incandescence Sizing of Nickel Nanoparticles

2011 ◽  
Author(s):  
K. J. Daun ◽  
M. Karttunen ◽  
J. T. Titantah
Keyword(s):  
Molecular Dynamics ◽  
Nickel Nanoparticles ◽  
Accommodation Coefficient ◽  
Dynamics Simulation ◽  
Nickel Surface ◽  
Carbonaceous Particles ◽  
Thermal Accommodation ◽  
Gas Molecule ◽  
Laser Induced Incandescence ◽  
Thermal Accommodation Coefficient

While time-resolved laser-induced incandescence is most often used to characterize the size and concentration of aerosolized carbonaceous particles, it has recently been applied to aerosols containing metal nanoparticles. This calculation requires the thermal accommodation coefficient, however, which is often difficult to determine experimentally. This paper presents a molecular dynamics investigation of the thermal accommodation coefficient between laser-energized nickel nanoparticles immersed in argon, and the underlying the gas-surface scattering physics. The predicted interaction between gas molecules and the laser-energized surface depends strongly on the potential between the gas molecule and a surface atom: a Lennard-Jones 6–12 potential derived using the Lorentz-Berthelot combination rules overestimates the potential well due to a bond-order effect in the nickel, resulting in strong trapping-desorption and near-perfect thermal accommodation. A Morse potential with parameters obtained directly from ab initio free energies predicts a relatively brief interaction between the gas molecule and nickel surface, on the other hand, and a lower thermal accommodation coefficient similar to experimentally-derived values for laser-energized iron nanoparticles in argon reported in the literature.

scholarly journals A Study on Time-Resolved Laser Induced Incandescence Analysis Method for the Measurement of Primary Particle Size in Diesel Exhaust

2006 ◽  
Vol 49 (4) ◽  
pp. 1351-1357 ◽  
Author(s):  
Jongil PARK ◽  
Hoon Chul RYOO ◽  
Hong Sik CHUN ◽  
Soonho SONG ◽  
Jae Won HAHN ◽  
...  
Keyword(s):  
Particle Size ◽  
Diesel Exhaust ◽  
Primary Particle ◽  
Primary Particle Size ◽  
Analysis Method ◽  
Time Resolved ◽  
Laser Induced Incandescence

Quantifying the Thermal Accommodation Coefficient for Iron Surfaces Using Molecular Dynamics Simulations

2015 ◽  
Author(s):  
T. A. Sipkens ◽  
K. J. Daun ◽  
J. T. Titantah ◽  
M. Karttunen
Keyword(s):  
Molecular Dynamics ◽  
Accommodation Coefficient ◽  
Time Resolved ◽  
Thermal Accommodation ◽  
Contemporary Science ◽  
Depth Analysis ◽  
Laser Induced Incandescence ◽  
Important Field ◽  
Thermal Accommodation Coefficient ◽  
Dynamics Simulations

With nanotechnology becoming an increasingly important field in contemporary science, there is a growing demand for a better understanding of energy exchange on the nanoscale. Techniques, such as time-resolved laser-induced incandescence, for example, require accurate models of gas-surface interaction to correctly predict nanoparticle characteristics. The present work uses molecular dynamics to define the thermal accommodation coefficient of various gases on iron surfaces. A more in depth analysis examines the scattering distributions from the surfaces and examines how well existing scattering kernels and classical theories can represent these distributions. The molecular dynamics-derived values are also compared to recent experimental time-resolved laser-induced incandescence studies aimed at evaluating the thermal accommodation coefficient across a range of surface-gas combinations.

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