Water-glass bead system and Euler-Euler dual-fluid model were used to simulate liquid-solid two-phase flow at fully developed stage of a vertical narrow channel with a dimension of 240 mm in length

12 mm in width and 1800 mm in height. The results show that the liquid-solid two-phase flow enters full development stage after 0.7 m in vertical direction of the narrow channel. At cross section of the full development stage

particle velocity and concentration in both wide and long axial directions were high in central region but low near wall area. With increase of inlet liquid velocity

solid particle velocity increased at each position of the cross section

while particle concentration decreased at center but increased near wall. With increase of initial solid phase volume fraction

solid particle concentration increased at each position of cross section

while particle velocity decreased slightly at center but increased slightly near wall. Particle thickening effect was observed in the region near three wall junction at both long axial ends of the channel cross-section. In the region of large particle velocity distribution and high concentration gradient along the wide direction of channel cross-section

non-dimensional proportion increased with increase of inlet liquid velocity but decreased with increase of initial solid volume fraction.