Characterisation of a gas-liquid PBC: Bubble size and gas holdup

Research output: Contribution to journalArticle

8 Citations (Scopus)

Abstract

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 of
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.
LanguageEnglish
Pages3019-3033
JournalAIChE Journal
Volume50
Issue number12
DOIs
Publication statusPublished - Dec 2004

Fingerprint

Bubbles (in fluids)
Gases
Liquids
Fluids
Hydrodynamics
Vortex flow
Turbulence

Keywords

  • oscillatory baffled column
  • bubble size
  • bubble breakage
  • gas holdup
  • vorticity
  • hydrodynamics

Cite this

@article{1893a93958384452a421c34775f30a7a,
title = "Characterisation of a gas-liquid PBC: Bubble size and gas holdup",
abstract = "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.",
keywords = "oscillatory baffled column, bubble size, bubble breakage, gas holdup, vorticity, hydrodynamics",
author = "Monica Oliveira and X. Ni",
year = "2004",
month = "12",
doi = "10.1002/aic.10282",
language = "English",
volume = "50",
pages = "3019--3033",
journal = "AIChE Journal",
issn = "0001-1541",
number = "12",

}

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 journalArticle

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 -