Vojtěch Šálek

This paper deals with the bulk density determination of char, which is an important input parameter for numerical simulations of pyrolysis. The aim was to develop a time and cost‐effective, non‐destructive, and repeatable method capable to determine the bulk density of highly porous, fragile wood and engineered wood samples of various shapes, namely char of spruce and oriented strand board. Char samples were prepared in a cone calorimeter under various heat flux exposures. Photogrammetry was chosen for this purpose. A detailed photogrammetric measurement procedure consisting of sample preparation, sample measurement and software reconstruction was designed and validated. It was found that the bulk density of char depends on the virgin material and the way char was formed. The spruce and oriented strand board char bulk density value is provided to be used in pyrolysis modeling and compared to literature.