The capability of external magnetic force towards intensifying the dynamics of nitrogen (N2) and hydrogen (H 2 ) in the monolithic channel is investigated through the computational fluid dynamics (CFD) approach. The ultimate aim of this study is to optimize the yield of ammonia (NH3) in a microfluidic environment; where the reaction between N 2 and H 2 is attributed by the aid of the nanocatalyst array that are imbued onto support wires and filled inside the monolithic channel. The configuration of wire elements in the channel is significant to enhance prevalent mixing of the reactant gases, which thus increases the synthesized NH 3 . Through ANSYS Fluent 15.0, the study shows that the monolithic channel that consists of 90° pitch-arranged wire elements and with less restrictive wire support at the entrance, middle and exit of the channel provides better mixing dynamics. The gases' velocity contour and its Lorentz force vector plots further indicates that the nanocatalyst should be densely grown at the locality after one-fifth the length of the channel from its entrance. The presence of magnetic field into the system provides not only to align the electron spin of the catalyst to enhance the reaction in the microfluidic environment, it also induces better prevalent mixing that implies to increasing the yield of NH 3 . © Published under licence by IOP Publishing Ltd.