Determination of the thermal properties of ceramic sponges
Determination of the thermal properties of ceramic sponges
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DOI：
10.1016/j.ijheatmasstransfer.2009.09.041
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发表时间：
2010-01-15
影响因子：
5.2
通讯作者：
Martin, H.
中科院分区：
文献类型：
--
作者：
Dietrich, B.;Schell, G.;Martin, H.
了解化学反应器中技术部件或内部构件的热特性通常是规划和设计化学工程过程的关键特征。作为填充床或填料的替代品，海绵被用于化学和加工工程的新应用领域。因此，进行了实验研究，以研究由氧化铝、莫来石和氧化结合碳化硅（OBSiC）制成的固体陶瓷海绵在中等温度下的两相导热率。二维模型用于分析测量的温度分布并计算热导率。可以观察到，导热率随着孔隙率的降低而增加，并且当孔径（ppi 数）变化时几乎恒定。热导率数据采用类似于众所周知的 Krischer 模型的方法进行建模。与球形颗粒填充床相比，海绵的导热系数大约高出五倍。 (C) 2009 Elsevier Ltd. 保留所有权利。
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. (C) 2009 Elsevier Ltd. All rights reserved.