Data On the rate of mixing of sand and salt particles in an air-fluidized bed are given in Table 28.3. At long mixing times it was shown that the mixing index Is closely approaches 1.0. Assuming Eqs. (28.24) and (28.25) apply to this system, how long will it take for the mixing index to reach 0.95? In each run the initial charge to the reactor was 254.4 g of salt on top of 300.0 g of sand. The average number of particles in each spot sample was 100.
