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Eulerian-Eulerian Modeling of Turbulent Gas-Particle Flow

Aldo Benavides (Institutionen för tillämpad mekanik)
Göteborg : Chalmers University of Technology, 2009. ISBN: 978-91-7385-261-6.- 98 s.

Gas-particle flow is encountered in a vast number of industrial operations and natural phenomena. Computational fluid dynamics plays an important role in practical engineering and fundamental research activities. For the numerical prediction of gas-particle two-phase flow, an Eulerian approach is employed in this work so as to describe the particulate-phase as a continuum medium with properties analogous to those of a fluid. In addition, kinetic theory of granular flow is used to derive closure relations that take into account particle-particle interaction and interstitial fluid effects. Two-way coupling considers momentum transfer from the dispersed particulate-phase to the continuous gas-phase through appropriate source terms in the momentum and turbulent kinetic energy conservation equations. A modified k-ε model is used to estimate the continuous phase turbulence. Balance of kinetic energy associated with particle random motion and the correlation between fluid-and-particle fluctuating velocity are also incorporated. Friction plays an important role in determining gas-particle flow at very high particulate-phase concentration, so the development of a frictional stress model is also discussed. The derived two-phase flow model is used for the prediction of dilute turbulent gas-particle flow in a backward-facing step and a cold CFB-riser. The study of dense particle flow restricts to the formation of a cavity in a granular bed by an impinging turbulent jet. Closure models are implemented in a commercial CFD software, and simulation results are thoroughly validated with available experimental data.

Nyckelord: CFD, two-phase flow, Eulerian approach, kinetic theory of granular flow

Denna post skapades 2009-05-26. Senast ändrad 2013-09-25.
CPL Pubid: 94415


Institutioner (Chalmers)

Institutionen för tillämpad mekanik (1900-2017)


Teknisk mekanik

Chalmers infrastruktur

Relaterade publikationer

Inkluderade delarbeten:

Numerical simulation and validation of dilute turbulent gas-particle flow with inelastic collisions and turbulence modulation

Numerical computation of turbulent gas-particle flow in a backward-facing step. Model comparison with experimental data

Comparison of experimental and simulation results for turbulent gas-solid riser flow


Datum: 2009-06-12
Tid: 10:00
Lokal: HA2, Hörsalsvägen 4, Chalmers
Opponent: Prof. Björn Hjertager, Department of Mathematics and Natural Sciences, University of Stavanger, Norway

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Doktorsavhandlingar vid Chalmers tekniska högskola. Ny serie 978