Experimental and numerical investigation on erosion of circular and elliptical immersed tubes in fluidized bed

The erosion of immersed tube is studied by experimental and simulation methods. The results of the ink removal experiment show that the severe erosion is located on both sides of the lower part of the immersed tube. The dense discrete phase model (DDPM) method is adopted to simulate the erosion law of the immersed tube. The results show that the variation law of erosion rate with operating parameters is consistent with that of χ with operating parameters. A new dimensionless parameter of χ is defined to characterize the erosion state of immersed tube, which represents the ratio of particle flow characteristics to particle fluidization characteristics. Particle flow characteristics (M_p) and particle fluidization degree (M_g) are directly and inversely proportional to erosion rate respectively. In addition, the erosion rate of EA type elliptical immersed tube is proved to be 53.68% lower than that of circular immersed tube, which is obtained from the simulation results.