Bubble column longitudinal dispersion

Longitudinal dispersion in the continuous phase (the liquid phase for a bubble column, and the emulsion phase for a fluidized catalyst bed) is closely related to flow properties of the equipment. Here, we wish to describe the longitudinal dispersion phenomena in terms of the fluid-dynamic properties of the equipment. The prime purpose is to test whether the fluid-dynamic analysis developed earlier is sound, but lon-... 

A gas bubble column is taken here as a model equipment undergoing longitudinal dispersion of the continuous phase. The theory obtained is equally applicable to a fluidized catalyst bed of good fluidity exhibiting similar flow properties. The following procedure is from Miyauchi (M27). 

Many data are available for the longitudinal dispersion coefficient of the bubble column in the recirculation flow regime. Most are summarized in Fig. 39. Of these, Kato and Nishiwaki (K6, and O), Ohki and Inoue... 

Fig. 39. Longitudinal dispersion coefficients of liquid in bubble columns (SN = single nozzle PP = perforated plate). The full circles are calculated with the use of Eq. (4-12).

Kato, Y., and Nishiwaki, A. (1972), Longitudinal dispersion coefficient of a liquid in a bubble column, IntemationalJoumal of Chemical Reactor Engineering, 12(1) 182-187. 

---