NDLI: Experimental and Numerical Determination of Thermal Radiative Properties of ZnO Particulate Media

Content Provider	The American Society of Mechanical Engineers (ASME) Digital Collection
Author	Coray, Patrick Lipin´ski, Wojciech Steinfeld, Aldo
Copyright Year	2008
Abstract	The radiative characteristics of packed beds of ZnO particles, applied in the design of high-temperature solar thermochemical reactors, were investigated experimentally. ZnO samples of varying thickness were exposed to a continuous beam of near monochromatic thermal radiation in the 0.5–1 μm wavelength range. The overall transmitted fraction measured as a function of sample thickness s obeys an exponential trend exp(–As), with the fit parameter A ranging from (4000 ± 100) m−1 at 555 nm to (2100 ± 100) m−1 at 1 μm. In the forward directions, the measured intensity distribution is approximately isotropic, whereas in the backward directions it is well approximated by a Henyey–Greenstein equation with asymmetry factor g ≈ − 0.4 at 555 nm and g ≈ − 0.1 at 1 μm. A Monte Carlo ray-tracing model of the experimental set-up is employed to extract the extinction coefficient and the scattering albedo for the case of non-grey absorbing-scattering medium.
Sponsorship	Heat Transfer Division
Starting Page	51
Ending Page	57
Page Count	7
File Format	PDF
ISBN	9780791848470
DOI	10.1115/HT2008-56236
e-ISBN	0791838323
Volume Number	Heat Transfer: Volume 1
Conference Proceedings	ASME 2008 Heat Transfer Summer Conference collocated with the Fluids Engineering, Energy Sustainability, and 3rd Energy Nanotechnology Conferences
Language	English
Publisher Date	2008-08-10
Publisher Place	Jacksonville, Florida, USA
Access Restriction	Subscribed
Subject Keyword	Spectroscopy Zinc oxide Packed bed Radiation Monte carlo Radiation scattering Scattering (physics) High temperature Wavelength Design Albedo Thermal radiation Radiation (physics) Electromagnetic scattering Particulate matter Solar energy Ray tracing
Content Type	Text
Resource Type	Article

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