Bubble characteristics(local gas hold hold up, vertical bubble length, bubble rising velocity) in bubble columns, three phase fluidized beds and three phase fluidized beds of floating contactors have been studied in a 15.2-cm ID pyrex glass column.
In bubble columns, the effects of liquid velocity(2 - 10 cm/sec), gas velocity (2 - 12 cm/sec) on bubble characteristics at different bed height(10 - 60 cm) and radial position (0.0 - 0.75) have been determined.
In three phase fluidized beds, the effects of liquid velocity(1 - 9 cm/sec), gas velocity(2 - 12 cm/sec) and particle size(0.4 - 6.0 mm) on bubble characteristics at different bed height(10 - 50 cm) have been determined.
In three phase fluidized beds of floating contactors, the effects of liquid velocity(2 - 8 cm/sec), gas velocity(2 - 12 cm/sec), particle size(1 - 3 mm) and the volume ratio between floating contactors and solid particles(0 - 30 %) on bubble characteristics have been determined.
In the bubble columns, bubble characteristics (local gas hold up, vertical bubble length, bubble rising velocity) increased with gas velocity along the bed height and it decreased with liquid velocity and the radial position.
The obtained data of local gas hold up and the vertical bubble length have been correlated as follows:
${\epsilon}_b = 0.011 U_g^{0.67} U_1^{-0.06} H^{0.10} (r'/R)^{0.36}$
$L_v = 0.216 U_g^{0.39} U_1^{-0.09} H^{0.32} (r'/R)^{0.12}$
In three phase fluidized beds, the local gas hold up increased with gas velocity and particle size along the bed height and it decreased with liquid velocity.
The vertical bubble length increased with gas velocity along the bed height and it decreased with liquid velocity and particle size.
The obtained data of local gas hold up and vertical bubble length have been correlated as follows:
${\epsilon}_b = 0.356 Fr_g^{0.389} Fr_1^{-0.101} (H/Hs)^{0.319} (d_p/D_c)^{-0.011}$
$L_v = 2.506 Fr_g^{0.222} Re_1^{-0.396} We_T^{0.268} (H/Hs)^{0.249} (d_p/D_c)^{-0.545}$
In three phase fluidized beds of floating contactors, the local gas hold up increased with gas velocity,floating contactors volume ratio and particle size along the bed height and it decreased with liquid velocity.
The vertical bubble length increased with gas velocity along the bed height and it decreased with liquid velocity, particle size and the volume ratio between floating contactors and solid particles.
The local gas hold up and the vertical bubble length have been correlated as follows:
${\epsilon}_b = 0.368 Fr_g^{0.377} Fr_1^{-0.109} (H/Hs)^{0.341} (d_p/D_c)^{0.076} (V_f/V_s)^{0.172}$
$L_v = 22.90 Fr_g^{0.240} Re_1^{-0.258} We_T^{0.028} (H/Hs)^{0.212}(V_f/V_s)^{-0.092}$
