Gas holdup and mass transfer characteristics of carboxymethyl cellulose solutions in a bubble column with a radial gas sparger

1993 ◽  
Vol 8 (5-6) ◽  
pp. 271-277 ◽  
Author(s):  
H. W. Ryu ◽  
Y. K. Chang ◽  
S. D. Kim
Keyword(s):  
Mass Transfer ◽  
Carboxymethyl Cellulose ◽  
Bubble Column ◽  
Gas Holdup ◽  
Transfer Characteristics

Gas holdup and mass-transfer characteristics in a three-phase bubble column

1986 ◽  
Vol 25 (2) ◽  
pp. 472-476 ◽  
Author(s):  
Eizo Sada ◽  
Hidehiro Kumazawa ◽  
Choulho Lee ◽  
Takahisa Iguchi
Keyword(s):  
Mass Transfer ◽  
Bubble Column ◽  
Gas Holdup ◽  
Transfer Characteristics ◽  
Three Phase

Effect of Vibrating Sparger on Mass Transfer, Gas Holdup, and Bubble Size in a Bubble Column Reactor

2013 ◽  
Vol 11 (1) ◽  
pp. 47-56 ◽  
Author(s):  
Laleh Hadavand ◽  
Ali Fadavi
Keyword(s):  
Mass Transfer ◽  
Transfer Coefficient ◽  
Mass Transfer Coefficient ◽  
Vibration Frequency ◽  
Bubble Size ◽  
Bubble Column ◽  
Gas Holdup ◽  
Bubble Column Reactor ◽  
Gas Velocity ◽  
Superficial Gas Velocity

Abstract Bubble size has a key role in gas holdup and mass transfer in bubble column reactors. In order to have small and uniform bubbles, a new structure was designed; the reactor operates in two modes, with vibrating sparger and conventional bubble column in which sparger is fixed. In vibrating mode, the sparger vibrates gently during gas entering. The vibrating sparger performs like a paddle, resulting in a forced recirculation of gas–liquid inside the reactor; moreover, the bubble detachment is accelerated. The superficial gas velocity was between 0.003 and 0.013 ms− 1, and the vibration frequency was changed between 0 and 10.3 Hz. The bubble size was measured at three various positions of the reactor height by photographic method and using MATLAB 7.0.1 software. The mass transfer coefficient was determined by means of the dynamic gassing-out method. The results show that the bubbles were bigger in vibrating mode than those working without vibration. The bubble size decreases with increase in height from sparger. Gas holdup increased with increase in superficial gas velocity and vibration frequency. The effect of vibration increased the gas holdup with an average of 70% for all superficial gas velocities. Volumetric mass transfer coefficient was almost stable as vibration frequency increased.

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