2. Mass burning rate In many situations, rather than concerning of the flame propagation speed of a flame, we prefer to examine the rate at which a flame can consume reactants on a mass basis, typically called the mass burning rate. For example, the heat release rate from the flame can be related to the mass burning rate and the heating value of the fuel. For a 1-d flame, the mass burning rate is typically defined as a mass flux, i.e., u(kg/m2s), since a simple increase in flame area will results in a greater mass consumption rate. (a) Find the pressure dependence of the mass burning rate of an unstretched, adiabatic, laminar flame, based on the two-zone, single-step global reaction rate model used to create the flame speed expression developed in class. (b) Estimate how much would the mass burning rate would change for a room temperature, methane-air mixture as the pressure was increased from 2 to 30 atm