The radiative characteristics of dependently scattering 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 wavelength range. The overall transmitted fraction measured as a function of sample thickness obeys an exponential trend , with the fit parameter ranging from at 555 nm to at . 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 factors at 555 nm and at . A Monte Carlo ray-tracing model of the experimental setup is employed to extract the extinction coefficient and the scattering albedo for the case of a nongray absorbing-scattering medium.
Experimental and Numerical Determination of Thermal Radiative Properties of ZnO Particulate Media
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Coray, P., Lipiński, W., and Steinfeld, A. (October 23, 2009). "Experimental and Numerical Determination of Thermal Radiative Properties of ZnO Particulate Media." ASME. J. Heat Transfer. January 2010; 132(1): 012701. https://doi.org/10.1115/1.3194763
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