A stochastic model for residence time and contact time distributions of the gas in multistage fluidised beds

A stochastic model based on Markov chain is proposed to describe the gas residence time distribution and contact time distribution in multistage fluidised beds. The Kolmogorov-Feller equations are solved by Laplace transform and subsequent numerical inversion. The effects of flow fluctuations on the distributions are discussed and the theoretical model is compared with the experimental data in literature. © 1974.