T_in 523[K] Inlet temperature T_amb 350[K] Ambient temperature rad 2[mm] Channel radius A pi*rad^2 Channel cross section area v_av 0.3[m/s] Average gas velocity UA 200[W/(K*m^3)] Volumetric heat transfer coefficient cNO_0 4.11e-2[mol/m^3] Inlet concentration NO cNH3_0 5.57e-2[mol/m^3] Inlet concentration NH3