Solve all three parts (i.e. a, b, c)

Problem 3 Consider the two-zone differential model of laminar flame propagation into an unburnt mixture of density pui (A) Solve the heat transfer differential equation in Zone I, the convection-diffusion zone, and argue that its length scale is au/Su where ay is the thermal diffusivity of the unburnt mixture. (3) (B) Given that there exists a linear relation between species mass fraction and temperature in Zone T-T Yet), evaluate the net mass flux of fuel into Zone II, the reaction-diffusion zone, T-Tu You = (given by 1 using your solution in part (A). How is your answer related to the net mass flux of fuel entering Zone 1? (3) (C) Sketch the product mass fraction profile in Zone I, providing actual numbers on the Y-axis (1)