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Materials 2012, 5(1), 192-209; doi:10.3390/ma5010192
Article

Effective Heat and Mass Transport Properties of Anisotropic Porous Ceria for Solar Thermochemical Fuel Generation

1,*  and 2,3
Received: 21 September 2011 / Revised: 20 November 2011 / Accepted: 16 January 2012 / Published: 19 January 2012
Download PDF [1493 KB, 30 January 2012; original version 19 January 2012]

Abstract

High-resolution X-ray computed tomography is employed to obtain the exact 3D geometrical configuration of porous anisotropic ceria applied in solar-driven thermochemical cycles for splitting H2O and CO2. The tomography data are, in turn, used in direct pore-level numerical simulations for determining the morphological and effective heat/mass transport properties of porous ceria, namely: porosity, specific surface area, pore size distribution, extinction coefficient, thermal conductivity, convective heat transfer coefficient, permeability, Dupuit-Forchheimer coefficient, and tortuosity and residence time distributions. Tailored foam designs for enhanced transport properties are examined by means of adjusting morphologies of artificial ceria samples composed of bimodal distributed overlapping transparent spheres in an opaque medium.
Keywords: porous media; morphology; transport; radiation; conduction; convection; fluid flow; anisotropy; solar; ceria porous media; morphology; transport; radiation; conduction; convection; fluid flow; anisotropy; solar; ceria
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Haussener, S.; Steinfeld, A. Effective Heat and Mass Transport Properties of Anisotropic Porous Ceria for Solar Thermochemical Fuel Generation. Materials 2012, 5, 192-209.

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