Ehsan Izadpanah

Micromixers play a crucial role in improving fluid mixing in microfluidic systems. Due to their small dimensions, effective mixing is often not achieved in these devices. Therefore, enhancing mixing efficiency in such systems has become one of the main challenges. In this study, the impact of jet flow on mixing performance in a passive micromixer is investigated through numerical simulations. The geometry of the micromixer consists of two coaxial pipes, with fluids entering through the inner and outer pipes, and exiting through the space between the two pipes. In the range of Reynolds numbers studied, three distinct jet flow patterns were observed, which had a significant impact on the flow and mixing of the two fluids. As the Reynolds number increases, the penetration depth of the fluid jet into the main flow increases, and the jet deflection becomes more pronounced, leading to an improvement in the mixing performance of the two fluids.