Eulerian-Eulerian Modeling of Turbulent Gas-Particle Flow
Doktorsavhandling, 2009

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.

kinetic theory of granular flow

Eulerian approach

two-phase flow

CFD

HA2, Hörsalsvägen 4, Chalmers
Opponent: Prof. Björn Hjertager, Department of Mathematics and Natural Sciences, University of Stavanger, Norway

Författare

Aldo Benavides

Chalmers, Tillämpad mekanik

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

Proceedings 11th International Conference on Multiphase Flow in Industrial Plants, MFIP 2008. September 7-10, Palermo, Italy.,; (2008)p. 63-70

Paper i proceeding

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

Circulating Fluidized Bed Technology IX. Proceedings of the 9th International Conference on Circulating Fluidized Beds, CFB-9. May 13-16, 2008. Hamburg, Germany.,; (2008)

Paper i proceeding

Ämneskategorier

Maskinteknik

ISBN

978-91-7385-261-6

Doktorsavhandlingar vid Chalmers tekniska högskola. Ny serie: 978

HA2, Hörsalsvägen 4, Chalmers

Opponent: Prof. Björn Hjertager, Department of Mathematics and Natural Sciences, University of Stavanger, Norway