NUMERICAL INVESTIGATION OF FLUID MIXING IN A MICROMIXER USING CFD SIMULATIONS

10th International Congress of the Serbian Society of Mechanics (18-20. 06. 2025, Niš) [pp. 79-88]

AUTHOR(S) / АУТОР(И): Mina Mirović , Veljko Begović , Petar Miljković , Danijela Srećković

Download Full Pdf   

DOI: 10.46793/ICSSM25.079M

ABSTRACT / САЖЕТАК:

This study investigates the mixing behavior of water and colored water in a complex micromixer geometry, using CFD simulations with Ansys Fluent® and ParticleWorks® to analyze performance. The two solvers employ distinct numerical methods: the Finite Volume Method (FVM) in Ansys Fluent®, which uses a computational mesh, and the meshless Moving Particle Simulation (MPS) method in ParticleWorks®. The simulations assess concentration profiles, pressure drop, and the mixing index across different Reynolds numbers and flow rates. Additionally, the impact of temperature differences between the inlet fluids on mixing quality was examined. The results of this study were validated against previously conducted experimental data and the CFX® numerical results confirm their accuracy and reliability.

The micromixer features a Y-mixer and an S-type microchannel, designed for improved fluid blending.

KEYWORDS / КЉУЧНЕ РЕЧИ:

Computational Fluid Dynamics (CFD), Micromixer, Mixing Index, Finite Volume Method (FVM), Moving Particle Simulation (MPS)

ACKNOWLEDGEMENT / ПРОЈЕКАТ:

REFERENCES / ЛИТЕРАТУРА:

  • Bökenkamp, D., Desai, A., Yang, X., Tai, Y.C., Marzluff, E.M., Mayo, S.L., Microfabricated Silicon Mixers for Submillisecond Quench-Flow Analysis, Chem., Vol. 70, No. 2, 1998, 232–236.
  • Engler, M., Kockmann, N., Kiefer, T., Woias, P., Numerical and Experimental Investigations on Liquid Mixing in Static Micromixers, Chemical Engineering Journal, Vol. 101, No. 1–3, 2004, pp. 315–322.
  • Hoffmann, M., Räbiger, N., Schlüter, M., Blazy, S., Bothe, D., Stemich, C., Warnecke, H.-J., Experimental and Numerical Investigations of T-Shaped Micromixers, Proceedings of the 11th European Conference on Mixing, Bamberg, Germany, 2003, pp. 269–276.
  • Dreher, S., Kockmann, N., Woias, P., Characterization of Laminar Transient Flow Regimes and Mixing in T-Shaped Micromixers, Taylor & Francis, 2011.
  • Khaydarov, V., Borovinskaya, E.S., Reschetilowski, W., Numerical and Experimental Investigations of a Micromixer with Chicane Mixing Geometry, Technische Universität Dresden and Saint-Petersburg State Institute of Technology, 2018.
  • Ansys, Inc., Ansys Fluent Theory Guide, Release 2021 R2, ANSYS, Inc., July 2021.
  • Koshizuka, S., Oka, Y., Moving-Particle Semi-Implicit Method for Fragmentation of Incompressible Fluid, Nuclear Science and Engineering, 123, No. 3, July 1996, pp. 421– 434.
  • Koshizuka, S., Current Achievements and Future Perspectives on Particle Simulation Technologies for Fluid Dynamics and Heat Transfer, 2010, pp. 155–168.
  • Danckwerts, P.V., The Definition and Measurement of Some Characteristics of Mixtures, Applied Scientific Research Section A, Vol. 3, 1952, pp. 279–296.
  • Cullen, P.J., Romañach, R.J., Abatzoglou, N., Rielly, C.D. (Eds.), Pharmaceutical Blending and Mixing, John Wiley & Sons Ltd, Chichester, UK, 2015.
  • Lobasov, A.S., Shebeleva, A.A., Initial Temperatures Effect on the Mixing Efficiency and Flow Modes in T-shaped Micromixer, J. Phys.: Conf. Ser., Vol. 899, 2017, 022010.