Behavior of Gas Bubbles in Fluid Beds

Analysis of the bubbling behaviour of 2D gas solid fluidized beds

“…9, the experimental and computational distributions of bubble equivalent size distribution are reported. The experimental distributions show a characteristic positive skewness of the distributions at all inlet gas velocities, in accordance with relevant literature data [46][47][48][49][50][51]. It is worth noting that at lower inlet gas velocities the right-hand tail of the distribution has a concave-up shape, as a result of the predominant coalescence phenomenon, which causes bubbles to increase their diameter by coalescence with similar bubbles.…”

Experimental analysis of bubble size distributions in 2D gas fluidized beds

“…Other authors (Argyriou et al, 1971;Morooka et al, 1972;Rowe and Yacono, 1975;Liu and Clark, 1995) adopted Gamma distributions to describe BSD data, finding agreement with experimental data. In particular, Argyriou et al (1971) used Gamma distributions to fit the distribution of bubbles volumes in fluidized beds, focusing on the importance of coalescence phenomena in determining bubble volume, bubble density and BSD.…”

“…According to the authors, bubble volume variance increases with the distance above the distributor. Morooka et al (1972) used Gamma functions to describe experimentally measured BSD. According to these authors, bubble growth appears to be negligible at sufficiently high distance from the distributor.…”

Relative contribution of variables affecting the reaction in fluid bed contactors

“…November, 1974 bubble-rich phase and the peripherally descending emulsion phase of low bubble content (Lewis et al, 1962;Morooka et al, 1971). Measurements under relatively high gas velocity of practical interest ( U f 2 10 cm/s) show that the rate of circulation is higher than that due to solid particles conveyed by the bubble wake.…”