Determination of the thermal properties of ceramic sponges

• Published in: International journal of heat and mass transfer 2010-01, Vol.53 (1), p.198-205
• Main Authors: Dietrich, B., Schell, G., Bucharsky, E.C., Oberacker, R., Hoffmann, M.J., Schabel, W., Kind, M., Martin, H.
• Format: Article
• Language: English
• Subjects: Applied sciences; Ceramic sponge; Chemical engineering; Energy; Energy. Thermal use of fuels; Exact sciences and technology; Heat and mass transfer. Packings, plates; Krischer model; Materials and auxiliary equipments used in energy engineering; Open-celled foam; Thermal properties; Two-phase thermal conductivity
• ISSN: 0017-9310; 1879-2189
• DOI: 10.1016/j.ijheatmasstransfer.2009.09.041

The knowledge of thermal properties of technical components or internals in chemical reactors is often a key characteristic for planning and designing chemical engineering processes. As an alternative to packed beds or packings, sponges turned out to be used in new application fields in chemical and process engineering. Therefore an experimental study was performed to investigate the two-phase thermal conductivity of solid ceramic sponges made of alumina, mullite and oxidic-bonded silicon carbide (OBSiC) at moderate temperatures. A two-dimensional model is used for analysing the measured temperature profiles and for calculating the thermal conductivity. It can be observed, that the thermal conductivity increases with decreasing porosity and is nearly constant when the pore size (ppi number) is varied. The thermal conductivity data are modelled by an approach similar to the well known Krischer model. Compared to a packed bed of spherical particles, the values of the thermal conductivity of sponges turn out to be about five times higher.