Abstract

Bed expansion data were obtained for unbaffled and two different types of baffled (coaxial rod and coaxial blade) gas–solid fluidized beds for varying operating parameters: fluid mass velocity, particle size, density and initial static bed heights. Correlations have been developed for the prediction of bed expansion. For this, the values of minimum fluidization mass velocity ( G mf) and settling mass velocity ( G S, considered as hindered settling) have been calculated with the help of available equations. The correlations developed are modified versions of those of Beranek and Sokol, where mass velocity ratio ( G R) has been used in place of velocity ( U): 1/R=f(G R ), where G R =(G f −G mf )/(G s −G mf ) Here, the entire range of G R has been divided into two regimes: 0< G R≤0.15 and 0.15< G R≤1.0.

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