CFD Parametric Study of Mixers Performance
Authors: Mikhail Strongin
The mixing of two or more liquids is very common in many industrial applications from automotive to food processing. CFD simulations of these processes require comparison with test results. In many cases it is practically impossible. Therefore, comparison provides with scalable tests. So, parameterization of the problem is sufficient to capture the performance of the mixer.
However, the influence of geometrical and thermo-physical parameters on the mixing is not well understood.
In this work influence of geometrical and thermal parameters was studied. It was shown that for full developed turbulent flows (Re > 104), Pet»const and concentration of secondary fluid ~ F(r/l).
In other words, the mixing is practically independent of total flow rate and scale for a given geometry and ratio of flow rates of mixing flows. This statement was proved in present work for different geometries and mixtures such as EGR and water-urea mixture.
Present study has been shown that the best way to improve the mixing is to establish geometry with the lowest Pet number possible by intensifying the turbulence in the domain. This is achievable by using step geometry, impinging flow EGR on a wall, or EGR jets, with a strong change in the flow direction, or using swirler like flow in the domain or combination all of these factors. All of these results are applicable to any mixtures of no compressible fluids.
Digital Object Identifier (DOI): doi.org/10.5281/zenodo.1087812Procedia APA BibTeX Chicago EndNote Harvard JSON MLA RIS XML ISO 690 PDF Downloads 1806
 A.K. Sahu, P. Kumar, A.W. Patwardhan, J.B. Joshi, (1999)CFD modelling and mixing in stirred tanks, Chemical Engineering Science, Volume 54, Issues 1314, July 1999, Pages 2285-2293
 C. G. Giannopapa B. J., van der Linden, W. van Druten, M. Bongers (2008), Modeling the mixing process of liquids with concentrates in capsules,2008 ASME Pressure Vessels and Piping Division Conference, PVP 2008-6133.
 2. Mikhail P. Strongin, Vadim Strots (2007). CFD Simulation of Urea Evaporation and Mixing. 1st Conference: MinNOx – Minimization of NOx Emissions Through Exhaust Aftertreatment, February 1-2,Berlin, Germany.
 Kevin Breisacher and Jeffrey Moder (2010), Computational Fluid Dynamics (CFD) Simulations of Jet Mixing in Tanks of Different Scales, NASA/TM-2010-216749, p.1-26.
 Mikhail P. Strongin, CFD Modeling of Mixing Process in Pump for Two Liquids with Different Temperatures, Proceedings of FEDSM2009,FEDSM-ICNMM2010-30969