The thermal conductivity of a powder depend on applied mechanical particle-particle pressure as well as interstitial gas pressure. A higher mechanical pressure results in higher thermal conductivity and the same is true for gas pressure.


Note
: Some other commercial measurement alternatives only consider the gas pressure.

 

Figure 1. Schematic arrangements for testing powder with a Hot Disk device.
Figure 2. Thermal conductivity of a powder as a function of mechanical and gas pressure.