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TECHNICAL PAPERS

Experimentally Determined Optical Properties of a Polydisperse Carbon Black Cloud for a Solar Particle Receiver

[+] Author and Article Information
Rudi Bertocchi, Abraham Kribus, Jacob Karni

Environmental Sciences and Energy Research Dept., Weizmann Institute of Science, Rehovot 76100, Israel

J. Sol. Energy Eng 126(3), 833-841 (Jul 19, 2004) (9 pages) doi:10.1115/1.1756924 History: Received September 01, 2003; Revised March 01, 2004; Online July 19, 2004
Copyright © 2004 by ASME
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References

Figures

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Schematic of Apparatus for Particle Cloud Generation System
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SEM micrograph of a two-hour old Carbon particle cloud at magnification 2000. β=0.62 m−1 at 1064 nm. Inset shows magnification of 10,000.
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Normalized particle population distribution of two particle clouds, β=1.55 m−1 and β=0.62 m−1 at 1064 nm. The distribution is a composite of scans at magnifications of 10,000, 2000 and 500.
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Experimental apparatus for measurement of optical properties
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Linear extinction coefficient vs. particle mass loading at λ=532 nm. The number density at a mass loading of 1 g/m3 is 1.5⋅1014 particles, and Ke=8.25
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Measured and predicted scattering phase function at 532 nm and 1064 nm. Mie theory results are based on the full particle population distribution, including agglomerates. Error bars represent 95% confidence. (a) 532 nm parallel polarization. (b) 532 nm perpendicular polarization. (c) 1064 nm parallel polarization. (d) 1064 nm perpendicular polarization.
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Effect of the agglomerates on the scattering phase function for perpendicular polarization, β=1.0 m−1. The full particle population distribution includes agglomerates, and the truncated distribution includes primary particles only (diameter less than 1 μm).
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Spectral dependence of phase function for perpendicular polarization at β=0.90 m−1.
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Spectral dependence of the scattering albedo at single scattering conditions. Error bars represent 95% confidence. Data for acetylene is from 1922. Data for toluene is from 22.

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