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The objective of the study is toinvestigate the effects of inletflow pulsation on the mixing and reaction performance of a heterogeneousgaseous T-junction microreactor numerically. The idea is to have anovel modular microreactor design comprised of two microreactors (Aand B), arranged in parallel, and a valve to control the flow direction.Flow pulsation can then be implemented to alternately supply reactantto microreactor A and microreactor B. Hence, by feeding the same amountof reactant and thus same pumping power/parasitic loads, the new designis able to run two microreactors and could achieve almost the samelevel of performance as that of a steady flow microreactor with anexpense of one microreactor. The study was carried out for a caseof mixing and heterogeneous catalytic reaction of methane (gaseousfuel) oxidation at the microreactor surface coated with a platinumcatalyst. A detailed parametric study was performed to include theeffect of frequency, amplitude, phase difference, and different waveformson the conversion rate of gaseous fuel and pressure drop across themicroreactor. The results suggest that the flow pulsation marginallyaffects the reaction performance, in which, the whole novel modularsystem produces almost double yields and energy (temperature) thanthat of conventional steady flow single microreactor design underthe same amount of inlet reactants. This highlights the potentialof this novel design in saving energy, enhancing reactants utilization,and increasing yield production for several applications. [ABSTRACT FROM AUTHOR]