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Materials 2014, 7(11), 7173-7195; doi:10.3390/ma7117173

Morphological Characterization and Effective Thermal Conductivity of Dual-Scale Reticulated Porous Structures

1
Department of Mechanical and Process Engineering, ETH Zürich, Sonneggstrasse 3, 8092 Zürich, Switzerland
2
Solar Technology Laboratory, Paul Scherrer Institute, 5232 Villigen PSI, Switzerland
*
Author to whom correspondence should be addressed.
Received: 3 September 2014 / Revised: 13 October 2014 / Accepted: 15 October 2014 / Published: 28 October 2014
(This article belongs to the Section Porous Materials)
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Abstract

Reticulated porous ceramic (RPC) made of ceria are promising structures used in solar thermochemical redox cycles for splitting CO2 and H2O. They feature dual-scale porosity with mm-size pores for effective radiative heat transfer during reduction and µm-size pores within its struts for enhanced kinetics during oxidation. In this work, the detailed 3D digital representation of the complex dual-scale RPC is obtained using synchrotron submicrometer tomography and X-ray microtomography. Total and open porosity, pore size distribution, mean pore diameter, and specific surface area are extracted from the computer tomography (CT) scans. The 3D digital geometry is then applied in direct pore level simulations (DPLS) of Fourier’s law within the solid and the fluid phases for the accurate determination of the effective thermal conductivity at each porosity scale and combined, and for fluid-to-solid thermal conductivity from 10−5 to 1. Results are compared to predictions by analytical models for structures with a wide range of porosities 0.09–0.9 in both the strut’s µm-scale and bulk’s mm-scale. The morphological properties and effective thermal conductivity determined in this work serve as an input to volume-averaged models for the design and optimization of solar chemical reactors. View Full-Text
Keywords: tomography; solar; thermochemical; conductivity; reticulated porous ceramic (RPC) tomography; solar; thermochemical; conductivity; reticulated porous ceramic (RPC)
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

Ackermann, S.; Scheffe, J.R.; Duss, J.; Steinfeld, A. Morphological Characterization and Effective Thermal Conductivity of Dual-Scale Reticulated Porous Structures. Materials 2014, 7, 7173-7195.

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