Numerical simulation of non-Newtonian nanofluids flow in passive injection micromixers using mixture model

In this study, mixing of laminar non-Newtonian nanofluids in an injection micromixer was numerically studied. The important and new feature of the study is using of non-Newtonian base fluid in nanofluid. The Titanium dioxide/0.5%wt Carboxymethyl Cellulose aqueous solution was used as nanofluid. Mixture model was used for simulation of nanofluid flow inside the micromixer. The governing equations were solved by finite volume method using a FORTRAN code. Also, in this paper, a new modified successive over-relaxation method has been introduced to considerably decrease the computation time. The results indicated that the number of injection flows and using of baffles had significant effect on mixing index. It should be noted that the distance between baffles is an important parameter in mixing.