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International Symposium on Multiphase Flow and Transport Phenomena
November, 5-10, 2000, Antalya, Turkey

DOI: 10.1615/ICHMT.1997.IntSymLiqTwoPhaseFlowTranspPhen


ISBN Print: 1-56700-162-9

MODELING TURBULENCE NON-ISOTROPY IN DISPERSED PARTICLE/LIQUID FLOWS

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ABSTRACT

Turbulence plays a very important role in the distribution of particles in dispersed particle/liquid flows. Single particle motion is affected by the intensity of the surrounding turbulence field and the size of turbulent eddies. Both parameters are customarily included in the development of dispersion models. Significantly, the non-isotropy of the turbulent field is usually neglected. However, it is well known from the available experimental data that the turbulence is seldom isotropic. Even in simple geometries, like pipe flow, turbulence is highly non-isotropic, with the largest components in the flow direction. This non-isotropy affects the motion of the particles. The modeling of turbulence non-isotropy requires the solution of the complete Reynolds stresses, which ТПРЯПК solving six partial differential equations instead of the customary solution of the turbulent kinetic energy equation. This requires considerable computational effort. In the present study an algebraic stress model for the non-isotropic velocity fluctuations for both the continuous (liquid) and dispersed (solid) phase is presented. This model requires considerably less computational resources than solving the complete set of Reynolds stress equations. This model has been successfully tested using a computational fluid dynamics (CFD) code. Simulations were done for solid particles of different densities − representing positive, negative, and neutral buoyant particles. The results were compared against experimental data, and good agreement with the computed results was observed.

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