Traditional gas-solid turbulence models using constant or the single-phase gas turbulent Prandtl number cause error in the thermal eddy diffusivity and thermal turbulent intensity fields calculation. The thermo-mechanical turbulence model is based on solving the hydrodynamic transport equations of the turbulent kinetic energy and turbulent time scale, beside the thermal turbulent equations of temperature variance and thermal turbulence time scale. This model has the ability to calculate the turbulent Prandtl number directly by computing the eddy viscosity and the thermal eddy diffusivity through the values of turbulence fluctuation velocity and thermal variances and time scales. A four way Eulerian/Lagrangian formulation was used to study the effect of particle properties on the turbulent flow and thermal fields, as well as on turbulent Prandtl number in a gas-solid developing pipe flow. Inter-particle collisions were included and the Lagrangian trajectory analysis was used. The earlier results showed that turbulent Prandtl number is influenced by the variations of gas and particle properties and also inter-particle collisions in a fully-developed riser. In the current study, the developing gas-solid flow region in a pipe was considered and the variation of turbulent flow field due to inter-particle collision was evaluated.
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ASME 2006 2nd Joint U.S.-European Fluids Engineering Summer Meeting Collocated With the 14th International Conference on Nuclear Engineering
July 17–20, 2006
Miami, Florida, USA
Conference Sponsors:
- Fluids Engineering Division
ISBN:
0-7918-4750-0
PROCEEDINGS PAPER
Particle Collision Effect on Turbulent Prandtl Number in Gas-Solid Flows
Zohreh Mansoori,
Zohreh Mansoori
Amirkabir University of Technology, Tehran, Iran
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Majid Saffar-Avval,
Majid Saffar-Avval
Amirkabir University of Technology, Tehran, Iran
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Hasan Basirat-Tabrizi,
Hasan Basirat-Tabrizi
Amirkabir University of Technology, Tehran, Iran
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Goodarz Ahmadi,
Goodarz Ahmadi
Clarkson University, Potsdam, NY
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Payam Ramezani
Payam Ramezani
Amirkabir University of Technology, Tehran, Iran
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Zohreh Mansoori
Amirkabir University of Technology, Tehran, Iran
Majid Saffar-Avval
Amirkabir University of Technology, Tehran, Iran
Hasan Basirat-Tabrizi
Amirkabir University of Technology, Tehran, Iran
Goodarz Ahmadi
Clarkson University, Potsdam, NY
Payam Ramezani
Amirkabir University of Technology, Tehran, Iran
Paper No:
FEDSM2006-98465, pp. 1771-1778; 8 pages
Published Online:
September 5, 2008
Citation
Mansoori, Z, Saffar-Avval, M, Basirat-Tabrizi, H, Ahmadi, G, & Ramezani, P. "Particle Collision Effect on Turbulent Prandtl Number in Gas-Solid Flows." Proceedings of the ASME 2006 2nd Joint U.S.-European Fluids Engineering Summer Meeting Collocated With the 14th International Conference on Nuclear Engineering. Volume 1: Symposia, Parts A and B. Miami, Florida, USA. July 17–20, 2006. pp. 1771-1778. ASME. https://doi.org/10.1115/FEDSM2006-98465
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