Behavior of non-spread diffusion flames of combustible liquid soaked in porous beds

Experimental studies were conducted to investigate the behaviors of non-spread diffusion flames of liquid fuel, e.g., methanol, soaked in porous beds at different sand bed depths. The capillary effect and heat conduction were the controlling mechanisms of the processes. The capillary pressure decreased with increasing bed depth due to the effects of gravity. The presented heat transfer model could quantitatively predict the interface position of the combustion of the liquid fuel in the porous bed and explain the appearing maximum value in the fuel consumption rate curves in the early stage of the combustion. Original is an abstract.