Solved Problem 147 Solved Problem 7.1 Particles having a minimum fluidization velocity of 0.020 m/s and a voidage at minimum fluidization velocity of 0.48 are being fluidized in a cylindrical column of diameter 1.3 m by air at a superficial velocity of 0.50 m/s. The expanded bed depth is 2.6 m. Assuming that the bed is operating in the bubbling flow regime, estimate the bed depth at minimum fluidization, the fraction of the bed volume occupied by bubbles, the mean bubble diameter at height 0.4H, and the corresponding bubble velocity. Compare the Mori and Wen predictions with those of the Darton correlation. Assume bub- bles form at the distributor with an initial diameter of 10 mm. How do you expect Epf , dg, and up to vary with increasing height, z