TY - JOUR
TI - DETERMINATION OF THE BUBBLE DIAMETER IN THE PRE-ERUPTION REGION OF THE FLUIDIZED BED
AU - Mickovska A
AU - Kostić Zvonimir A
AU - Stojkovski Valentino M
AU - Nošpal Aleksandar T
JN - Thermal Science
PY - 1998
VL - 2
IS - 1
SP - 57
EP - 70
PT - Article
AB - The experimental determination of the bubble diameter is performed in two-dimensional bed with annular cross section, in the bubble pre-eruption region using video-based method. The results showed that the
average bubble diameter in the pre-eruption region is increasing with the increase of the total number of fluidization, and it is not influenced by the composition of the binary mixture. Based on the experimental
research,new empirical equation for estimation of the bubble diameter in the pre-eruption region is developed. Fluidization regime was characterized using fluidization number defined as ratio of superficial gas velocity and minimum fluidization velocity.
The minimum fluidization velocity of the mixture is defined in two ways: as apparent minimum fluidization velocity umf-p and total minimum fluidization velocity Umf - T. Respectively, for description of the fluidization regime, 
apparent and total number of fluidization are defined as a ratio between the superficial gas velocity and minimum fluidization velocity: U<sub>f</sub>/U<sub>mf-P</sub> and U<sub>f</sub>/U<sub>mf-T</sub>.