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

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

1
Institute of Mechanical Engineering, EPFL, Lausanne 1015, Switzerland
2
Department of Mechanical and Process Engineering, ETH Zurich, Zurich 8092, Switzerland
3
Solar Technology Laboratory, Paul Scherrer Institute, Villigen 5232, Switzerland
*
Author to whom correspondence should be addressed.
Received: 21 September 2011 / Revised: 20 November 2011 / Accepted: 16 January 2012 / Published: 19 January 2012
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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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This is an open access article distributed under the Creative Commons Attribution License (CC BY 3.0).

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MDPI and ACS Style

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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