8 research outputs found
Bubble Size and Frequency in Corrugated-Wall Bubbling Fluidized Bedsî—¸Image Analysis and Neural Network Correlations
Digital image analysis was implemented to monitor bubbling
dynamics
in corrugated-wall bubbling fluidized beds (CWBFB) loaded with Geldart
D particles. Various geometrical configurations were investigated
in terms of corrugation angle, interwall clearance, and rest bed height
and gas superficial velocity. Implementation of wall corrugation led
to improved gas–solid fluidization quality with respect to
flat-wall bubbling fluidized beds (FWBFB) as measured in terms of
retreat of the onset of bubbling as a function of gas flow rate, of
reduction of bubble sizes and rise velocities, and of increase of
bubble frequency. Two artificial neural network correlations valid
both for FWBFB and CWBFB were recommended for estimation of bubble
frequency and size using a common set of independent variables, that
is, gas superficial-minimum bubbling velocity ratio, bed rest height,
corrugation angle, average clearance, and vertical location. The bubble
frequency <i>explicit</i> correlation accounted additionally
for interwall minimum clearance and distance between side wall and
either neck or hip of front plate, at a given elevation, whereas bubble
size correlation needed bubble frequency as a supplementary input
variable