Flame propagation over a liquid fuel film on a substrate with low thermal conductivity

The propagation of a flame over the surface of a liquid fuel deposited on a substrate with low thermal diffusivity has been studied. It has been shown that this system-fuel and substrate – is not thermally thin. Heat transfer in front of the flame edge due to the motion of the liquid under the temperature gradient in the liquid layer (the Marangoni effect) has been analyzed. Estimates of temperature gradients in the condensed phase, the thickness of the liquid fuel layer in front of and below the flame front are given. The velocity of the diffusion flow of the fuel in the gas phase at the flame edge is estimated. It is shown that the temperature gradient along the surface of the liquid film determines the velocity of the film and the rate of diffusion of the evaporated fuel to the flame edge.