Mass transfer studies of external-loop airlifts and a bubble column

AIChE Journal ◽  
1989 ◽  
Vol 35 (3) ◽  
pp. 393-405 ◽  
Author(s):  
Milan K. Popovic ◽  
Campbell W. Robinson
Keyword(s):  
Mass Transfer ◽  
Bubble Column ◽  
External Loop ◽  
Mass Transfer Studies

Mass Transfer Studies in a Novel Perforated Plate Bubble Column

2010 ◽  
Vol 8 (1) ◽  
Author(s):  
S. Dhanasekaran ◽  
T. Karunanithi
Keyword(s):  
Mass Transfer ◽  
Liquid Velocity ◽  
Bubble Column ◽  
Perforated Plate ◽  
Gas Velocity ◽  
Plate Spacing ◽  
Mass Transfer Studies ◽  
Superficial Gas Velocity ◽  
Superficial Liquid Velocity

This investigation reports the experimental and theoretical results carried out to evaluate the volumetric mass transfer coefficient (kLa) in a novel hybrid rotating and reciprocating perforated plate bubble column. Countercurrent condition is performed. kLa is studied by the absorption of oxygen from air into deoxygenated water at room temperature (27 ± 1°C). Effects of agitation level, superficial gas velocity, superficial liquid velocity and plate spacing on kLa were analyzed and found to be significant. With an increase in agitation level at a constant superficial gas and liquid velocities, the breakage process of gas bubbles starts to be more pronounced and intensive oxygen mass transfer occurs. Hence, kLa increases sharply. kLa increases with an increase in superficial gas velocity, due to higher gas holdup and the enhanced breakup of bubbles. Similarly, kLa increases with an increase in superficial liquid velocity and the effect is found to be significant. When plate spacing is decreased (by increasing the number of plates), it is observed that the kLa increases at higher superficial gas velocity and agitation level. Correlation is developed for the determination of kLa and found to concur with experimental results. This correlation can be used for the determination of kLa for this hybrid column with 95% accuracy within the range of variables investigated in this present study.

scholarly journals Effect of packed bed on mass transfer in external-loop airlift bubble column.

1996 ◽  
Vol 29 (4) ◽  
pp. 582-587 ◽  
Author(s):  
Kenji Okada ◽  
Yoshiko Nagata ◽  
Yasuharu Akagi
Keyword(s):  
Mass Transfer ◽  
Bubble Column ◽  
Packed Bed ◽  
External Loop

scholarly journals Packing size effect on the liquid circulation property in an external-loop packed bubble column

2021 ◽  
Author(s):  
Yanling Tang ◽  
Gang Luo ◽  
Zhenmin Cheng
Keyword(s):  
Mass Transfer ◽  
Transfer Coefficient ◽  
Mass Transfer Coefficient ◽  
Bubble Column ◽  
Gas Holdup ◽  
Oxygen Absorption ◽  
Liquid Mass ◽  
External Loop ◽  
Packing Size ◽  
Liquid Mass Transfer

Packing size effects on the fluid dynamics in an external-loop packed bubble column with Raschig rings of three different effective diameters (5, 14 and 41 mm) in the riser were investigated. The overall gas holdup, liquid circulating velocity and gas-liquid mass transfer coefficient were respectively measured by volume expansion method, tracer-response method and dynamic oxygen-absorption technique. CFD simulation with the Euler-Euler two-fluid method was used to predict the liquid circulating velocity by treating the packing as a porous medium. Compared to the empty column, the gas holdup was found to increase with the presence of packing, however, the liquid circulating velocity and gas-liquid mass transfer coefficient may increase or decrease. Specifically, the gas holdup increases with the decrease of packing size, while the liquid circulating velocity is on the contrary, which induces the maximal gas-liquid mass transfer rate at packing diameter of 14 mm.

Effect of Plate Geometry on Characteristics of Fluid Flow and Mass Transfer in External-Loop Airlift Bubble Column.

1999 ◽  
Vol 32 (5) ◽  
pp. 689-695 ◽  
Author(s):  
Toshiro Miyahara ◽  
Hitoshi Hamanaka ◽  
Toshiyuki Umeda ◽  
Yasuharu Akagi
Keyword(s):  
Mass Transfer ◽  
Fluid Flow ◽  
Bubble Column ◽  
External Loop ◽  
Plate Geometry

Gas holdup, liquid circulating velocity and mass transfer properties in a mini-scale external loop airlift bubble column

2003 ◽  
Vol 58 (15) ◽  
pp. 3353-3360 ◽  
Author(s):  
Shaoqing Wang ◽  
Yoshihiro Arimatsu ◽  
Kenichi Koumatsu ◽  
Keiji Furumoto ◽  
Makoto Yoshimoto ◽  
...  
Keyword(s):  
Mass Transfer ◽  
Bubble Column ◽  
Gas Holdup ◽  
External Loop ◽  
Transfer Properties
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