On the thermal conductivity of sintered metallic fibre structures |
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| Authors: | C Veyhl T Fiedler O Andersen J Meinert T Bernthaler IV Belova GE Murch |
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| Affiliation: | 1. The University of Newcastle, School of Engineering, Centre for Mass and Thermal Transport in Engineering Materials, Callaghan, NSW 2308, Australia;2. Fraunhofer Institute for Manufacturing Technology and Advanced Materials, Branch Lab Dresden, Winterbergstr. 28, 01277 Dresden, Germany;3. University of Applied Sciences Aalen, Department of Surface Engineering and Material Science, Faculty of Mechanical and Material Engineering, Beethovenstr. 1, 73430 Aalen, Germany |
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| Abstract: | The present paper investigates the anisotropic thermal conductivity of a novel sintered metallic fibre structure with different porosities (i.e. 51.9%, 74.9%, 81.4%). Different methodologies are applied: numerical calculations (i.e. Finite Element and Lattice Monte Carlo methods) based on micro-computed tomography images, experimental tests (i.e. steady-state plate method) and analytical modelling. Good agreement between the numerical methods and experimental measurements is obtained for high porosity models (i.e. porosity > 72.5%). Furthermore, the thermal conductivity decreases with increasing porosity. A distinct thermal anisotropy is found where maximum values are in the parallel direction and minimum values in the transverse direction to the fibres. |
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