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Effective Heat and Mass Transport Properties of Anisotropic Porous Ceria for Solar Thermochemical Fuel Generation
Institute of Mechanical Engineering, EPFL, Lausanne 1015, Switzerland
Department of Mechanical and Process Engineering, ETH Zurich, Zurich 8092, Switzerland
Solar Technology Laboratory, Paul Scherrer Institute, Villigen 5232, Switzerland
* Author to whom correspondence should be addressed.
Received: 21 September 2011; in revised form: 20 November 2011 / Accepted: 16 January 2012 / Published: 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
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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.
Haussener S, Steinfeld A. Effective Heat and Mass Transport Properties of Anisotropic Porous Ceria for Solar Thermochemical Fuel Generation. Materials. 2012; 5(1):192-209.
Haussener, Sophia; Steinfeld, Aldo. 2012. "Effective Heat and Mass Transport Properties of Anisotropic Porous Ceria for Solar Thermochemical Fuel Generation." Materials 5, no. 1: 192-209.