Abstract
isotropic turbulence. The steep increase in the gas holdup with oscillation was mainly due to bubble entrainment by large vortices, formed by the oscillatory flow in the presence of baffles. A semi-theoretical expression, based on the forces acting on a bubble, was proposed, and was able to accurately match the experimental trends. The results also show that the gas-liquid hydrodynamics are mainly governed by the oscillatory operating conditions, and independent of the type of gas sparger.
| Language | English |
|---|---|
| Pages | 3019-3033 |
| Journal | AIChE Journal |
| Volume | 50 |
| Issue number | 12 |
| DOIs | |
| Publication status | Published - Dec 2004 |
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Keywords
- oscillatory baffled column
- bubble size
- bubble breakage
- gas holdup
- vorticity
- hydrodynamics
Cite this
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Characterisation of a gas-liquid PBC : Bubble size and gas holdup. / Oliveira, Monica; Ni, X.
In: AIChE Journal, Vol. 50, No. 12, 12.2004, p. 3019-3033.Research output: Contribution to journal › Article
TY - JOUR
T1 - Characterisation of a gas-liquid PBC
T2 - AIChE Journal
AU - Oliveira, Monica
AU - Ni, X.
PY - 2004/12
Y1 - 2004/12
N2 - A fundamental experimental study of gas-liquid contacting in an oscillatory baffled column is presented focusing on the effect of fluid oscillation on gas holdup and bubble size. The results show that beyond a critical level of fluid oscillation the Sauter mean diameter of the dispersion is substantially reduced, while the gas holdup (and, thus, the residence time of the gas phase) increases significantly. The reduction of bubble size was described in terms of bubble breakage, caused by the interaction of the bubbles with eddies. The experimental results were modeled by applying Kolmogoroff’s theory ofisotropic turbulence. The steep increase in the gas holdup with oscillation was mainly due to bubble entrainment by large vortices, formed by the oscillatory flow in the presence of baffles. A semi-theoretical expression, based on the forces acting on a bubble, was proposed, and was able to accurately match the experimental trends. The results also show that the gas-liquid hydrodynamics are mainly governed by the oscillatory operating conditions, and independent of the type of gas sparger.
AB - A fundamental experimental study of gas-liquid contacting in an oscillatory baffled column is presented focusing on the effect of fluid oscillation on gas holdup and bubble size. The results show that beyond a critical level of fluid oscillation the Sauter mean diameter of the dispersion is substantially reduced, while the gas holdup (and, thus, the residence time of the gas phase) increases significantly. The reduction of bubble size was described in terms of bubble breakage, caused by the interaction of the bubbles with eddies. The experimental results were modeled by applying Kolmogoroff’s theory ofisotropic turbulence. The steep increase in the gas holdup with oscillation was mainly due to bubble entrainment by large vortices, formed by the oscillatory flow in the presence of baffles. A semi-theoretical expression, based on the forces acting on a bubble, was proposed, and was able to accurately match the experimental trends. The results also show that the gas-liquid hydrodynamics are mainly governed by the oscillatory operating conditions, and independent of the type of gas sparger.
KW - oscillatory baffled column
KW - bubble size
KW - bubble breakage
KW - gas holdup
KW - vorticity
KW - hydrodynamics
U2 - 10.1002/aic.10282
DO - 10.1002/aic.10282
M3 - Article
VL - 50
SP - 3019
EP - 3033
JO - AIChE Journal
JF - AIChE Journal
SN - 0001-1541
IS - 12
ER -