q 0.04 Optimization parameter Da 1e-4 Darcy number L 1[mm] Length scale rho 1000[kg/m^3] Density of water eta 1e-3[Pa*s] Viscosity of water c_in 1[mol/m^3] Concentration at inlet k_a 0.25[mol/(m^3*s)] Reaction rate coefficient delta_p 0.25[Pa] Pressure drop vol 3*L*6*L Volume of the reacting domain D 3e-8[m^2/s] Diffusion coefficient