RESEARCH ON REDUCING EROSION BY ADDING RIBS ON THE WALL IN PARTICULATE 2-PHASE FLOWS

In the particulate two-phase Row with smooth wall and rib-welding wall , improved k-epsilon turbulence model and one-way coupling method are employed to compute particle velocities and trajectories, and wall was tage caused by particle impacts. In order to verify the computational results, an apparatus is designed and corresponding experiment is made . Both computational and experimental results show that adding ribs on the wall can reduce wall erosion caused by particle impacts in the pa rticulate two-phase Row. The wall wastage does not vary linearly as ri b height. Under a definite rib height, it is most beneficial to reduce erosion when rib width is equal to gap between ribs. For a definite f low, in the region with relative small particle size, the variety of w astage rate changes steeply, whereas particle size exceeds a criterion , the wastage rate changes smoothly. The initial angle of motion direc tion between particles and gas affects the wall wastage.