Journal of computational fluids engineering (한국전산유체공학회지)

Korean Society of Computational Fluids Engineering (한국전산유체공학회)
권호 표지

TRANSIENT FLOW SIMULATION OF A MIXER WITH FREE SURFACE

자유표면을 고려한 교반기 내부의 비정상 유동해석

  • Published : 2006.12.31
Download PDF
⟨ Previous Next ⟩

Abstract

In the present study, a numerical analysis of transient mixer flow is performed considering free surface formation. The flow patterns and free surface shape in a mixers formed by flat paddle and pitched paddle impellers are predicted. In a flat paddle mixer, two flow circulation regions are formed due to strong radial flow, whereas one large circulation is formed in a pitched paddle mixer due to axial downward flow. These differences affect the free surface evolution and shape. It is seen from the results that a flat paddle mixer gives deeper free surface at center region than a pitched paddle mixer. The free surface of 8-blades-flat-paddle mixer is also simulated to compare with the available experimental and simulation results. The present computational results agree reasonably well with the experimental data.

Keywords

References

  1. 장재원, 허남건, 2001, "산업용 교반기 내부 정상/비정상 유동특성 해석," 유체기계 연구개발 발표회 논문집, pp. 460-465.
  2. 박경현, 김경천, 2001, "러쉬톤 교반기의 초기 비정상 유동특성," 대한 기계학회 논문집, pp.1543-1551.
  3. Ciofalo, M., Brucato, A., Grisafi, F. and Torraca, N., 1996, "Turbulent Flow in Closed and Free surface Unbaffled Tanks Stirred by Radial Impellers," Chemical Engineering Science, Vol.51, pp.3557-3573. https://doi.org/10.1016/0009-2509(96)00004-8
  4. Smit, L. and During, J., 1999, "Vortex geometry in stirred vessels," Proceedings of the 7th European Congress on Mixing, part11, pp.633-639.
  5. Aubin, J., Fletcher, D.F. and Xuereb, C., 2004, "Modeling Turbulent Flow in Stirred Tanks with CFD: The Influence of the Modeling Approach, Turbulence Model and Numerical Scheme," Experimental Thermal and Fluid Science, Vol.28, pp.431-445. https://doi.org/10.1016/j.expthermflusci.2003.04.001
  6. Nagata, S., 1975, Mixing: Principle and Applications., Wiley, New York.