Temperature Influence on the Effective Thermal Conductivity of Cellular Metals Measured in Stagnant Air

For the optimum use of cellular metals, good knowledge of the properties is a necessary precondition. One of the significant thermophysical properties is the effective thermal conductivity representing the various heat transfer processes. Furthermore, cellular metals have complex structures, which make the experimental investigation of this effective thermal conductivity rather complicated. For the present investigations, hollow sphere structures from different steel alloys and open cell structures made of FeCrAl have been measured with two instruments, the transient plane source technique and the panel test technique up to about 250 °C and 800 °C in air, respectively. The results of both methods show good agreement. The effective thermal conductivity measurements are influenced by the effects of temperature, porosity and pore diameter.