Development of an empirical wall-friction model for 2D simulations of pseudo-2D bubbling fluidized beds

Abstract

A. (2016). Development of an empirical wallfriction model for 2D simulations of pseudo-2D bubbling fluidized beds. Advanced Powder Technology, 27(2), pp. 521-530.

Improvement of the simulation of fuel particles motion in a fluidized bed by considering wall friction

“…• v i I is the stress tensor for phase i. To account for the effect of the front and rear walls of the pseudo−2D bed, the extra body force term f f ric is incorporated in Equation 4, as proposed by Hernández-Jiménez et al [31]. This term can be neglected for the gas phase as it is expected to have a comparatively minor effect.…”

“…The model allows for the simulations of the wall−friction effect in pseudo−2D beds using a 2D domain instead of a more computationally demanding 3D domain. The results obtained by Hernández-Jiménez et al [31] showed that the incorporation of the wall−friction model produces a clear improvement of conventional 2D simulations.…”

“…The wall effect in numerical simulations of gas−solids pseudo−2D systems has been investigated in several numerical studies using either TFM or CFD−DEM models, demonstrating its relevance [26,27,28,29,30]. Recently, Hernández-Jiménez et al [31] developed an empirical model to easily account for the particle−wall interaction effect in pseudo−2D fluidized beds. The model allows for the simulations of the wall−friction effect in pseudo−2D beds using a 2D domain instead of a more computationally demanding 3D domain.…”

“…In the present work, the motion of a fuel particle in a pseudo-2D bubbling fluidized bed is simulated employing a hybrid TFM−DEM model and introducing the new friction term associated to the wall effect proposed by Hernández-Jiménez et al [31]. Therefore, in this work, the effect of the change of the fluiddynamics of the bed, produced by friction of the dense phase with the front and rear walls, on the motion of fuel particles is considered for the first time.…”

Dynamic viscoplastic granular flows: A persistent challenge in gas-solid fluidization

“…Finally, Yang et al also point to the use of simplified boundary conditions that impose a zero gradient of rotational temperature. Thisconstraint impedes the dissipation of granular energy via particle-wall friction, even though wall friction is known to be an essential influence in quasi-2D systems[75].…”