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TECHNICAL PAPERS

Carbon Particle Cloud Generation for a Solar Particle Receiver

[+] Author and Article Information
Rudi Bertocchi

Environmental Sciences and Energy Research Department, Weizmann Institute of Science, Rehovot 76100, Israele-mail: rudi.bertocchi@weizmann.ac.il

J. Sol. Energy Eng 124(3), 230-236 (Aug 01, 2002) (7 pages) doi:10.1115/1.1488666 History: Received August 01, 2001; Revised March 01, 2002; Online August 01, 2002
Copyright © 2002 by ASME
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References

Hunt, A. J., 1982, “Solar Testing of the Small Particle Heat Exchanger (SPHER),” Berkley California, Report LBL-16497.
Abdelrahman,  M., Fumeaux,  P., and Suter,  P., 1979, “Study of Solid-Gas Suspension used for Direct Absorption of Concentrated Solar Radiation,” Sol. Energy, 22, pp. 45–48.
Hunt, A. J., 1979, “A New Solar Receiver Utilizing a Small Particle Heat Exchanger,” Proc. of 14th Int. Society of Energy Conversion Engineering Conf., 1 , pp. 159–163.
Miller, F. J., 1988, “Radiative Heat Transfer in a Flowing Gas Particle Mixture,” Ph.D. thesis, Univ. of California, Berkley.
Bohren, C. F., and Huffman, D. K., 1983, Absorption and Scattering of Light by Small Particles, Wiley, New York.
Krishnan, S. S., Lin, K.-C., and Faeth, G. M., 2000, “Extinction and Scattering of Soot Emitted from Turbulent Diffusion Flames for Wavelengths of 250–5200 nm,” Proc. of 34th National Heat Transfer Conf., Pittsburgh, PA.
Oman,  J., and Novak,  P., 1996, “Volumetric Absorption in Gas-Properties of Particles and Particle-Gas Suspensions,” Sol. Energy, 56(6), pp. 597–605.
Bertocchi, R., Kribus, A., and Karni, J., 2001, “Optical Properties of a Stable Polydisperse Carbon Particle Cloud,” ASME J. Heat Transfer (submitted).
Stone, J. N., 1997, “Cyclone Design and Analysis,” www.mnsi.net/∼pas/esco.htm, Esco Engineering, Kingsville, Ontario, Canada.
Taylor, J. R., 1982, An Introduction to Error Analysis, University Science Books.

Figures

Grahic Jump Location
Layout of full-scale particle cloud generator
Grahic Jump Location
SEM micrographs of sampled carbon particle clouds: a) Asbury 5317 at magnification of 250, b) CCC 3500 at magnification of 250, c) Asbury 5358 at magnification of 500. Insert shows magnification of 10000. Large amount of primary particles appears in the lesser magnification as the light background specks.
Grahic Jump Location
Settling rate of two different carbon particle clouds. Particle cloud consisting of CCC 3500 ceased to exist after 1.5 hrs, while the cloud consisting of Asbury 5358 stabilized after initial settling, showing only very slowly changing properties.
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Normalized particle population distribution of two Asbury 5258 particle clouds, originating from different manufacturing batches. Error bars represent one standard deviation. Particle cloud at β=11.8 1/m generated by full-scale particle generator, cloud at β=0.62 1/m by small-scale generator. The distributions are a composite of SEM scans at magnifications of 10000, 2000, and 500.
Grahic Jump Location
Linear extinction coefficient versus particle mass loading of Asbury 5358 at 532 nm. Slope represents specific extinction cross-section, γ. Miller’s 4 data (442 nm) is similar to results from the full-scale generator.
Grahic Jump Location
Performance of full-scale particle generator with optimal ejection nozzle. Endurance can be extended by operating several dispersal units in parallel, or by increasing dispersal bowl’s capacity. Start-up transient of free ejection case omitted.

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