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Research Papers: Combustion and Reactive Flows

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

[+] Author and Article Information
K. J. Daun1

Department of Mechanical and Mechatronics Engineering, University of Waterloo, 200 University Avenue West, Waterloo, ON, N2L 3G1, Canadakjdaun@mme.uwaterloo.ca

G. J. Smallwood, F. Liu

Institute for Chemical Process and Environmental Technology, National Research Council Canada, 1200 Montreal Road, Ottawa, ON, K1A 0R6, Canada

1

Corresponding author.

J. Heat Transfer 130(12), 121201 (Sep 25, 2008) (9 pages) doi:10.1115/1.2977549 History: Received January 25, 2008; Revised May 12, 2008; Published September 25, 2008

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.

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Copyright © 2008 by American Society of Mechanical Engineers
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Figures

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Figure 4

Linear regression of the pyrometrically derived soot temperature

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Figure 5

Experimentally measured αT values between soot and various gases

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Figure 6

Soot particle cooling rates in various gases specified by C1α

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Figure 7

Accommodation coefficients recalcuated by neglecting energy accommodation into internal energy modes (γ=5∕3)

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Figure 8

Influence of delay time on measured α values

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Figure 1

Schematic of the experimental apparatus

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Figure 2

Histogram of the number of primary particles per aggregate of soot sampled from the LII chamber. The inset shows a TEM image of a typical soot aggregate

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Figure 3

Heat conduction between a primary particle and the surrounding gas takes place in the near-free-molecular regime

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