| Abstract: | A direct, non-disturbing flash photolysis dye technique has been used to measure liquid velocities in 2.465-in. beds of 0.1248, 0.233 and 0.368-in. diameter lucite spheres at porosities of 0.8 and 0.9. Aggregative fluidization, including layering, was observed in all beds, and increased in magnitude with the larger spheres. Distinct velocity maxima were found from 0.5 to 2 particle diameters from the wall and distinct minima at from 0.6 to 1.2 particle diameters for the more particulately fluidized beds. Variations in velocity greater than the mean were observed. Conservatively estimated wall shear stresses were 2 to 5 times times larger than in the open pipe. |
