Determination of the surface temperature of a burning powder

An improved method for determining the temperature of a powder combustion surface is proposed. The method is based on the following physical consideration: After extinguishing the powder, the heat accumulated in a relatively small surface layer propagates into the depths of the charge. If the change in temperature at some point within the charge is recorded, this will permit the establishment of a temperature profile and the determination of the combustion surface temperature of the powder at the beginning of the experiment. Thus, direct calorimetry is completely eliminated. Working formulas are obtained on the basis of a simplified plane problem of thermal conductivity for a half space simulating powder specimens after quenching.