Open AccessExperimental evaluation of the thermal conductivity for additive manufactured materials. New test facility concept and preliminary tests
Author(s) -
Nicola Bianco,
R. Mastrullo,
A.W. Mauro,
Luca Viscito
Publication year - 2021
Publication title -
journal of physics. conference series
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.21
H-Index - 85
eISSN - 1742-6596
pISSN - 1742-6588
DOI - 10.1088/1742-6596/1868/1/012008
Subject(s) - thermal conductivity , materials science , measure (data warehouse) , thermal conduction , calibration , porosity , thermal conductivity measurement , flash (photography) , heat transfer , thermal , thermal diffusivity , porous medium , thermal mass , process engineering , nuclear engineering , composite material , computer science , thermodynamics , optics , engineering , mathematics , physics , statistics , database
Items for heat transfer made by metal foams or additive manufactured structures allow to create special components for several applications (i.e. fast response PCM, complex and light HEXs working at high temperatures for the aerospace sector). For their design thermo-physical properties data are required, such as thermal conductivity. To accurately measure this parameter with conventional procedures for metallic items (e.g. flash methods), the specific heat and density should be measured each time depending on the actual composition of the porous media (estimation is not yet reliable and porosity not known). The scope of this paper is to validate a test facility and the relative method for the data reduction to proof the possibility to measure directly the thermal conductivity with samples of small size. The experiments, carried-out with square samples (30×30 mm 2 ), allow to measure a range of thermal conductivity between 5 and 50 W/m K. The main aspect of the experimental method is the calibration of the heat losses towards the environment by means of a reverse technique. The assessment of the results against samples of known materials was good.