Numerical computation of turbulent gas-particle flow in a 90 degree bend: comparison of two particle modelling approaches

Krishna Mohanarangam, Zhaofeng Tian, Jiyuan Tu

Abstract


A numerical study into the physical characteristics of dilute gas-particle flows over a square-sectioned $90^\circ$~bend is reported. Two approaches, namely the Lagrangian particle tracking model and Eulerian two fluid model are employed to predict the gas-particle flows. Renormalization Group based $k$-$\epsilon$ model is used as the turbulent closure for both the approaches; however, for the Eulerian model, additional transport equations are solved to account for the combined gas-particle interactions and the turbulence kinetic energy of the particulate phase. In comparison to both Eulerian-Eulerian and Eulerian-Lagrangian approaches the former was found to yield closer agreement with the measured values. The Eulerian-Lagrangian approach obtains finer details of the behaviour of particles, while Eulerian-Eulerian model can be used for industrial scale problems. All the simulated results are compared against the experimental finding of Kliafas and Holt (1987).

References
  • J. A. C. Humphrey, J. H. Whitelaw, and G. Yee. Turbulent flow in a square duct with strong curvature. J. Fluid Mech., 103:443--463, 1981. doi:10.1017/S0022112081001419.
  • Y. Kliafas and M. Holt. Ldv measurements of a turbulent air-solid two-phase flow in a 90 degree bend. Exp. Fluids, 5:73--85, 1987. doi:10.1007/BF00776177.
  • J. D. Kulick, J. R. Fessler, and J. K. Eaton. Particle response and turbulence modification in fully developed channel flow. J. Fluid Mech., 277:109--134, 1994. doi:10.1017/S0022112094002703.
  • Z. F. Tian, J. Y. Tu, and G. H Yeoh. Numerical simulation and validation of dilute gas- particle flow over a backward-facing step. Aerosol Sci. Technol., 39:319--332, 2005. doi:10.1080/027868290930961.
  • J. Y Tu. Computational of turbulent two-phase flow on overlapped grids. Numer. Heat Transfer Part B Fundam, 32:175?195, 1997. doi:10.1080/10407799708915004.
  • J. Y. Tu and C. A. J. Fletcher. An improved model for particulate turbulence modulation in confined two-phase flows. Int. Commun. Heat Mass Transfer, 21(6):775--783, 1994. doi:10.1016/0735-1933(94)90031-0.
  • J. Y. Tu and C. A. J. Fletcher. Numerical computation of turbulent gas-solid particle flow in a 90 degree bend. AIChE Journal, 41(10):2187--2197, 1995. doi:10.1002/aic.690411003.
  • A. Adeniji-Fashola and C. P. Chen. Modelling of confined turbulent fluid-particle flows using eulerian and lagrangian schemes. Int. J. Heat Mass Transfer, 3(4):691--701, 1990. doi:10.1016/S0307-904X(98)00007-9.
  • F. Durst, D. Milojevic, and B. Schonung. Eulerian and lagrangian predictions of particulate two-phase flows :a numerical study. Appl. Math. Model, 8(2):101--115, 1984. doi:10.1016/0307-904X(84)90062-3.
  • J. R. Fessler and J. K. Eaton. Particle response in a planar sudden expansion flow. Expl Thermal and Fluid Sci, 15:413--423, 1997. doi:10.1016/S0894-1777(97)00010-1.
  • J. R. Fessler and J. K. Eaton. Turbulence modification by particles in a backward-facing step flow. J. Fluid Mech, 394:97--117, 1999. http://journals.cambridge.org/action/displayAbstract?aid=15369.

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DOI: http://dx.doi.org/10.21914/anziamj.v48i0.69



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