Numerical Study of Flow Structures and the Intensity of Segmentation of Impinging Jets in Various Y Typed Micro Mixers

Micro-Chemo-Mechanical System (MCMS) can greatly enhance the efficiency of heat and mass transfer, and produce revolutionary changes in many areas related to chemical process. But up to now, we know very little about the mechanism of micro-fluidic motion in the Impinging jet micromixer [1]. The finite volume method is used to solve the set of equations of the continuity equation, three- dimensional incompressible variable density Navier-Stokes equations and the diffusion equation. The adaptive grid technique is used in the computation, and the domain is spatially discretized using cubic finite volumes organized hierarchically as an octree. The computational field and the arrangement of jets are shown in (Fig. 1). Close to the exit, there is a plate with a circular hole. Next, we study the effect of inlet speed of jets, the angle of jets to flow structures from three-dimensional stream lines (Fig. 2), vortex lines, and isosurface of concentration and sections of concentration field. Meantime, we also discuss the effect of inlet speed of jets and the angle of incidence of jets to the intensity of segmentation of impinging jets. It is clear that the angle of jets and the inlet speed have important effects to the mixing effect. The smaller the angle of incidence of jets and the larger the inlet speed of jets, the lower the intensity of segmentation, i.e., the better of mixing property. Figure 1 Sketch of computational region Figure 2 The time evolution of 3D stream lines with T r , isosurface of t1 and t 2 , vortex lines with Tvof, for α = 90° and high speed jets