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Effect of Selective Accommodation on Soot Aggregate Shielding in Time-Resolved Laser-Induced Incandescence Experiments

[+] Author Affiliations
K. J. Daun

University of Waterloo, Waterloo, ON, Canada

Paper No. IMECE2009-11658, pp. 255-264; 10 pages
doi:10.1115/IMECE2009-11658
From:
  • ASME 2009 International Mechanical Engineering Congress and Exposition
  • Volume 3: Combustion Science and Engineering
  • Lake Buena Vista, Florida, USA, November 13–19, 2009
  • Conference Sponsors: ASME
  • ISBN: 978-0-7918-4376-5 | eISBN: 978-0-7918-3863-1
  • Copyright © 2009 by ASME

abstract

Time-resolved laser-induced incandescence (TiRe-LII) is an emerging diagnostic for characterizing primary-particle size distributions within soot-laden aerosols. This measurement requires an accurate model of heat conduction between the laser-energized soot and the surrounding gas, which is complicated by fractal-like structure of soot aggregates since primary particles on the aggregate exterior shield the interior from approaching gas molecules. Previous efforts to characterize aggregate shielding using Direct-Simulation-Monte-Carlo (DSMC) analysis assume a monatomic gas and a Maxwell kernel, which is known to be a poor representation of true gas/surface scattering physics. This paper investigates how selective thermal accommodation into the translational and rotational modes of the gas molecule influences the aggregate shielding effect using the Cercignani-Lampis-Lord (CLL) kernel and thermal accommodation coefficients derived from molecular dynamics simulations.

Copyright © 2009 by ASME
Topics: Lasers , Light emission , Soot

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