6 research outputs found
Bubble size prediction in gas–solid fluidized beds using genetic programming
The hydrodynamics of a gas–solid fluidized bed (FB)
is affected by the bubble diameter, which in turn
strongly influences the performance of a fluidized bed
reactor (FBR). Thus, determining the bubble diameter
accurately is of crucial importance in the design and
operation of an FBR. Various equations are available
for calculating the bubble diameter in an FBR. It has
been found in this study that these models show a
large variation while predicting the experimentally
measured bubble diameters. Accordingly, the present
study proposes a new equation for computing the
bubble diameter in a fluidized bed. This equation has
been developed using an efficient, yet infrequently
employed computational intelligence (CI)-based datadriven
modelling method termed genetic programming
(GP). The prediction and generalization performance
of the GP-based equation has been compared with
that of a number of currently available equations for
computing the bubble diameter in a fluidized bed and
the results obtained show a good performance by the
newly developed equation
The influence of acoustic field and frequency on Hydrodynamics of Group B particles
Sound Assisted Fluidized Bed (SAFB) of group B particles (180μm glass bead) has been studied in a 46mm I.D. column with aspect ratios of 1.4 and 2.9. A loudspeaker mounted on the top of the bed was supplied by a function generator with square wave to generate the sound as the source of vibration of the fluidized bed. The sound pressure level (referred to 20μpa) was varied from 102 to 140dB and frequencies from 70Hz to 170Hz were applied. The effects of sound pressure level, sound frequency and particle loading on the properties of SAFB were investigated. The experimental result showed that the minimum fluidization velocity decreased with the increase in sound pressure level, also minimum fluidization velocity was varied with variation of frequencies. At resonance frequency minimum fluidization velocity was found to be minimum. The bed height did not show an appreciable increase in presence of high acoustic field and at resonant frequency. Minimum fluidization velocity verses frequency curve in presence of sound intensity varied with variation of bed weight