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用于太阳能热化学燃料生成的各向异性多孔二氧化铈的有效传热传质特性

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

作者信息

Haussener Sophia, Steinfeld Aldo

机构信息

Institute of Mechanical Engineering, EPFL, Lausanne 1015, Switzerland.

Department of Mechanical and Process Engineering, ETH Zurich, Zurich 8092, Switzerland.

出版信息

Materials (Basel). 2012 Jan 19;5(1):192-209. doi: 10.3390/ma5010192.

DOI:10.3390/ma5010192
PMID:28817039
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC5448949/
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.

摘要

采用高分辨率X射线计算机断层扫描技术来获取用于太阳能驱动热化学循环中分解水和二氧化碳的多孔各向异性二氧化铈的精确三维几何结构。反过来，断层扫描数据被用于直接的孔隙尺度数值模拟，以确定多孔二氧化铈的形态和有效热/质传输特性，即：孔隙率、比表面积、孔径分布、消光系数、热导率、对流换热系数、渗透率、达西-福希海默系数以及曲折度和停留时间分布。通过调整由不透明介质中双峰分布重叠透明球体组成的人工二氧化铈样品的形态，研究了用于增强传输特性的定制泡沫设计。

https://cdn.ncbi.nlm.nih.gov/pmc/blobs/425f/5448949/cc6f20b7cfe3/materials-05-00192-g012.jpg
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https://cdn.ncbi.nlm.nih.gov/pmc/blobs/425f/5448949/0d015da96b86/materials-05-00192-g006.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/425f/5448949/7b6491724b35/materials-05-00192-g007.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/425f/5448949/4a963fb50d9e/materials-05-00192-g008.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/425f/5448949/4559e31afb19/materials-05-00192-g009.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/425f/5448949/d19cee293192/materials-05-00192-g010.jpg
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