The behavior of non-sphere particles in a gas-solid dense phase fluidized bed allocated with three vertical internals was simulated by the Eulerian two-fluid model. The effects of particle shapes were taken into account by an inter-phase drag model

and more effort was devoted to the effects of the boundary conditions of particles at walls. Meanwhile

experiments of a three dimensional lab-scale fluidized bed were conducted to provide available validation data. The quantitative analyses included axial profile of the pressure

radial profile of solids concentration

and power spectral density of particle mass flow rate at the bed outlet. It showed that specular reflection coefficient only affects the macroscopic behavior of the bed slightly

but the local particle motion near walls significantly for the bed without internals. While for the bed with internals featuring a remarkable increase in wall area

specular reflection coefficient can significantly influence dynamics of gas and solids. Therefore

the value of specular reflection coefficient should be selected in an appropriate range for beds with internals

to predict the system reasonably.