1984 Volume 10 Issue 2 Pages 184-191
Local gas concentration around a single bubble rising in a two- or three-dimensional fluidized bed was measured in detail by penetrative optical fiber probes. The relation between cloud radius determined by a video system (VTR) and gas concentration profiles detected by optical fiber probes was demonstrated in the two-dimensional bed.
Based on this, the observed cloud radius and gas concentration profiles in the cloud phase in the three-dimensional bed were compared with those predicted by previous models. In particular, the effect of the ratio of bubble rising velocity to interstitial gas velocity was examined for various kinds of particles as well as of fluidizing gas, and the following empirical formula for the interphase mass transfer coefficient was proposed.
kob=0.127D1/3g1/3α-2/9
