Derivation of a temperature-dependent accommodation coefficient for use in modeling laser-induced incandescence of soot |
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Authors: | H A Michelsen |
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Institution: | (1) Combustion Research Facility, Sandia National Labs, Livermore, CA, USA |
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Abstract: | This paper presents a derivation of an expression to estimate the accommodation coefficient for gas collisions with a graphite
surface, which is meant for use in models of laser-induced incandescence (LII) of soot. Energy transfer between gas molecules
and solid surfaces has been studied extensively, and a considerable amount is known about the physical mechanisms important
in thermal accommodation. Values of accommodation coefficients currently used in LII models are temperature independent and
are based on a small subset of information available in the literature. The expression derived in this study is based on published
data from state-to-state gas-surface scattering experiments. The present study compiles data on the temperature dependence
of translational, rotational, and vibrational energy transfer for diatomic molecules (predominantly NO) colliding with graphite
surfaces. The data were used to infer partial accommodation coefficients for translational, rotational, and vibrational degrees
of freedom, which were consolidated to derive an overall accommodation coefficient that accounts for accommodation of all
degrees of freedom of the scattered gas distributions. This accommodation coefficient can be used to calculate conductive
cooling rates following laser heating of soot particles. |
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Keywords: | PACS" target="_blank">PACS 65 80 +n 78 20 Nv 42 62 -b 44 05 +e |
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