HEAT-TRANSFER MECHANISMS IN LIQUID POOL FIRES

The heat transfer mechanisms in liquid pool fires were studied. The heat balance in the combustion system which includes both the liquid fuel and the burner vessel was discussed. The convective heat from the vessel wall to the fuel is dominant in small scale pool fires, and was calculated using the finite difference program. The heat flux between the wall and the fuel during flame spreading over tile fuel below its flash point in the vessel of small width was calculated. From the results, it was found that the poorer the thermal conductivity of the vessel the larger the heat flux from the wall to the fuel immediately below the fuel surface. The liquid level at which a flame self-quenches was measured for various materials and wall thicknesses of the vessel. The concentration gradient of fuel at the self-quenching liquid level was found to be nearly constant for a given fuel.