Ehsan Izadpanah

In this project, the effect of vortex-induced vibration (VIV) of an elastically mounted rigid circular cylinder with two degrees of freedom movement on the mixing process in a straight channel micromixer is studied. The main objective is to investigate the effect of the reduced velocity ranging from 2 to 16 and the Peclet number in the range of 200 to 800 on the mixing index, pressure drop, mixing performance, streamwise and transverse displacements and oscillations frequencies. In this regard, the governing equations of the fluid flow are solved using the finite volume numerical method. In addition, the mass-spring-damper system is utilized in order to model the cylinder vibration. The results indicate that the VIV improves the mixing efficiency significantly at the low reduced velocities. In addition, the positive effect of VIV on mixing performance is greater at high Peclet numbers. In comparison with the stationary cylinder, at the reduced velocities of 2.5 and 4.5, an amazing improvement of 82.7% in the mixing index and 24% in the mixing performance is observed, respectively. As an achievement, the VIV phenomenon can be utilized in practice as a passive technique to improve the mixing efficiency of micromixers in a wide range of scientific and industrial applications.