A equivalence ratio

Catalysts are often implemented in the walls of monolith channels, with overall performance depending on a balance between surface reactivity and flow conditions. Consider a situation that represents a catalytic-combustion monolith such as in a gas-turbine system (e.g., Fig. 17.17), where an individual channel diameter of d = 2 mm and a length of L = 5 cm. The channel walls may be assumed to be isothermal at Tw = 800°C. A CH4-air mixture enters the monolith with a equivalence ratio of(p = 0.3, inlet temperature of Tm — 400°C, and pressure of p = 1 atm. 

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