Thermal Conductivity Computations of Sintered Hollow Sphere Structures

Metals

Christoph Veyhl¹  Thomas Fiedler¹  Tobias Herzig²  Andreas ൬hsner¹  Timo Bernthaler²  Irina V. Belova¹ 

[1] Centre for Mass and Thermal Transport in Engineering Materials, School of Engineering, The University of Newcastle, Callaghan, NSW 2308, Australia;Department of Surface Engineering and Materials Science, Faculty of Mechanical and Materials Engineering, University of Applied Sciences Aalen, Aalen 73430, Germany;

关键词: hollow sphere structure;    cellular material;    micro-computed tomography;    finite element analysis;    thermal conductivity;   

DOI  :  10.3390/met2020113

来源: mdpi

【 摘 要 】

The thermal conductivity of sintered hollow sphere structures (HSS) is investigated within the scope of this paper. For this purpose, finite element analyses based on micro-computed tomography images are performed on HSS structures. The complex geometry of the real sintered HSS sample is accurately captured with this new hybrid method. The numerical computations are investigated in three perpendicular directions (i.e., x, y and z) in order to examine the anisotropic material behaviour. The results indicate that sintered HSS reveals quasi-isotropic behaviour in terms of effective thermal conductivity. For the first time, the influence of the sphere wall thickness of real HSS is investigated. To this end, the computed tomography data is carefully manipulated by changing the thickness of the hollow sphere wall. The variation of the wall thickness alters the relative density and has a significant influence on the thermal conductivity. The influence of the relative density on the thermal conductivity reveals a linear dependency.

【 授权许可】

CC BY   
© 2012 by the authors; licensee MDPI, Basel, Switzerland.