Consider the two-zone differential model of laminar premixed flame. We will evaluate the Damkohler Number (Da) in Zone Il in this problem. Da can be defined as the ratio of the kinetics rate to the convection rate. The negligibly small fuel mass fraction in zone Il is given as Yr, whereas Or is the width and WjR is the kinetics-based specific fuel consumption rate (kg/ms) in zone II. Also given are pu, Su, Yiu, Pb, So with their usual connotations. (A) Express the convective mass flux of fuel into Zone Il in terms of the given parameters 1 (B) Express the net fuel consumption rate within Zone Il in the same units as part (B) (1) (C) Da is the ratio of your answers in parts (B) and (A). Show that Da = Yfu (4) (1) YAR