A comparative study of the effect of model lift coefficients on particle trajectory

The objective of the present work is to (i) study the influence of different model lift coefficients, (ii) evaluate the importance of particle rotation, and (iii) compare the present computed results with two-way coupling results (in open literature) on the particle trajectory in dilute two-phase gas-solid horizontal channel flow. A hybrid Eulerian-Lagrangian method is employed where the Reynolds averaged Navier-Stokes (RANS) equations with k-e closure are used to model the fluid phase, and the particulate phase is treated via Lagrangian approach. Particle-wall collision is modeled using impulse-momentum equations. Five different models of lift coefficients (and/or lift forces) are selected from the open literature to evaluate the influence of lift force on the particle. The effect of shear lift is relatively very small as compared to lift due to particle rotation. Particle rotational velocities of the order of magnitude as high as 10(4)-10(5) rad/s are encountered due to particle-wall collision. Results of computed particle trajectories with simplified assumptions agree closely with (i) the simulated results of FLUENT(Version 6.1) with one-way and two-way coupling, and (ii) of other authors using two-way coupling. In terms of particle lift (and trajectory), the simulated results of FLUENT with one-way coupling are in agreement with the literature than two-way coupling.