ESTONIAN ACADEMY
PUBLISHERS
eesti teaduste
akadeemia kirjastus
PUBLISHED
SINCE 1984
 
Oil Shale cover
Oil Shale
ISSN 1736-7492 (Electronic)
ISSN 0208-189X (Print)
Impact Factor (2022): 1.9
NUMERICAL SIMULATION OF UPRISING TURBULENT FLOW BY 2D RANS FOR FLUIDIZED-BED CONDITIONS; pp. 147–163
PDF | doi: 10.3176/oil.2010.2.05

Authors
A. KARTUSHINSKY, I. KRUPENSKI, A. SIIRDE, Ü. RUDI
Abstract

2D RANS (Reynolds Average Navier Stokes) equations are used for numerical modeling of uprising particulate (gas-solid particle) turbulent flow in con­di­tions of fluidized beds. The two-fluid model approach was used in giving numerical simulations. The flow domain is a round pipe with diameter of 1 m and height of 6 m (a real industrial object). The flow of mean velocity 4 m/s carries solid particles (material density 2000 kg/m3; sizes of 0.3, 1 and 1.5 mm) with mass flow ratio 10 kg/kg.

    The mathematical model pertains to gravitational and viscous drag forces, Magnus and Saffman lift forces, effects of inter-particle collisions as well as particle interaction with the wall, effect of turbulence modulation (turbulence enhancement) at particles’ presence. The fluidized-bed conditions consider that flow conditions were set for high-temperature flow, density of the carrier fluid 0.329 kg/m3, and kinematic viscosity 1.55·10–4 m2/s.

    The results are presented in the form of distribution of axial and radial velocity components of gaseous and solid phases, particle mass concentra­tion and kinetic turbulent energy along the flow height at the flow exit (highest downstream position) and in the middle cross-section (intermediate position) in order to observe development of particulate flow.

    As shown by the results, the 2D RANS model qualitatively and quantitatively describes the real-time distribution of flow in a real flow domain, i.e. the model covers reasonable physical phenomena occurring in fluidized-bed conditions.
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