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Thermo-mechanical modeling of turbulent heat transfer in gas-solid flows including particle collisions

AutorMansoori, Z.; Saffar-Avval, M.; Basirat-Tabrizi, H.; Ahmadi, G.; Laín, S.
Fecha de publicación2002
EditorElsevier
CitaciónInternational Journal of Heat and Fluid Flow 23: 792-806 (2002)
ResumenA thermo-mechanical turbulence model is developed and used for predicting heat transfer in a gas-solid flow through a vertical pipe with constant wall heat flux. The new four-way interaction model makes use of the thermal kθ-τθ equations, in addition to the hydrodynamic k-τ transport, and accounts for the particle-particle and particle-wall collisions through a Eulerian/Lagrangian formulation. The simulation results indicate that the level of thermal turbulence intensity and the heat transfer are strongly affected by the particle collisions. Inter-particle collisions attenuate the thermal turbulence intensity near the wall but somewhat amplify the temperature fluctuations in the pipe core region. The hydrodynamic-to-thermal times-scale ratio and the turbulent Prandtl number in the region near the wall increase due to the inter-particle collisions. The results also show that the use of a constant or the single-phase gas turbulent Prandtl number produces error in the thermal eddy diffusivity and thermal turbulent intensity fields. Simulation results also indicate that the inter-particle contact heat conduction during collision has no significant effect in the range of Reynolds number and particle diameter studied. © 2002 Elsevier Science Inc. All rights reserved.
URIhttp://hdl.handle.net/10261/51187
DOI10.1016/S0142-727X(02)00187-X
Identificadoresdoi: 10.1016/S0142-727X(02)00187-X
issn: 0142-727X
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