Cited by 567Fluid Dynamics and MixingMinerals Flotation and Separation TechniquesGranular flow and fluidized beds

Bubble-Size distributions and flow fields in bubble columns

Lehr, F., Millies, M., Mewes, D.·2002·AIChE Journal

Abstract

Abstract Bubble‐size distributions and flow fields in bubble columns are calculated numerically. The population balance is simplified and reduced to a balance equation for the average bubble volume. Models developed predict the rate of bubble breakup and coalescence based on physical principles. The flow fields are numerically calculated for bubble columns with cylindrical cross sections using the Euler‐Euler method. The newly derived balance equations for the average bubble volumes are implemented into a commercial CFD code. The solutions of the balance equation for high superficial gas velocities result mainly in two fractions: one for the fraction with small and the other for the fraction with large bubble diameters. Both are considered pseudocontinuous phases, in addition to the liquid phase. The calculated flow fields are characterized by several large‐scale vortices. The local volume fractions of gas and liquid are locally inhomogeneous and highly time‐dependent. The time‐averaged flow field is axisymmetric and stationary. The calculated volume fractions, velocities, and bubble‐size distributions agree well with existing and previously published experimental results for bubble columns up to 0.3 m in diameter.

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Crossref · 10.1002/aic.690481103

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48 of 48 references verified0 citation errors · 0 not checkable

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  • An advantage of the model of Lehr et al. [276] is that for small bubbles a breakage in two bubbles of equal size has the highest probability, while an unequal size breakage has a higher probability if the size of the bubbles increases.

    “An advantage of the model of Lehr et al. [276] is that in the case of small bubbles a breakage in two bubbles of equal size has the highest probability, while an unequal size breakage has a higher probability if the size of the bubbles increases.”
  • Lehr et al. [276] based their breakage model on a mechanism where bubbles deform due to turbulent flow, become stretched, neck, and break, with assumptions that break-up is due to collision of eddies of different sizes with a bubble, only binary break-up is considered, break-up is determined by balance between interphase forces and inertial forces of the eddy, and only eddies smaller than the

    “Lehr et al. [276] based their breakage model on the following mechanism of the bubble rupture. First, bubbles deform due to the action of the turbulent flow field. Subsequently, they become stretched in one direction, leading to necking in the shape, and finally, bubbles break. The assumptions used to develop the break-up kernel are that the break-up of bubbles in a turbulent flow field is due to”
  • Lehr et al. [276] assume that eddies with bigger sizes only transport bubbles and eddies with smaller sizes do not have sufficient energy to affect bubble motion.

    “It is assumed that eddies with bigger sizes only transport bubbles and eddies with smaller sizes do not have sufficient energy to affect bubble motion.”
  • Lehr et al. [276] consider coalescence of more than two bubbles at the same time as a time series of subsequent binary coalescence events.

    “Lehr et al. [276] consider the coalescence of more than two bubbles at the same time as a time series of subsequent binary coalescence events.”
  • Lehr et al. [276] assume that collisions arise due to turbulent fluctuations and from the difference in rising velocity of bubbles of different sizes.

    “Collisions are assumed to arise due to turbulent fluctuations and from the difference in the rising velocity of bubbles of different sizes.”

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Authors
Lehr, F., Millies, M., & Mewes, D.
Affiliations
Leibniz University Hannover (DE)
Corresponding author
Mewes, D.
Venue
AIChE Journal
Publisher
Wiley
Published
2002-11
Volume
48
Issue
11
Pages
2426-2443
ISSN
  • 0001-1541 (ISSN-L)
  • 1547-5905
OpenAlex
W2166225626
Cited by
567
References
48
Citations by year
2026: 34 · 2025: 49 · 2024: 42 · 2023: 43 · 2022: 27 · 2021: 49 · 2020: 33 · 2019: 42 · 2018: 31 · 2017: 21 · 2016: 30 · 2015: 17 · 2014: 21 · 2013: 18 · 2012: 14
FWCI
6.22
Type
journal article
Language
en
Open access
closed
Locations
AIChE Journal (publishedVersion)
Topics
  • Physical Sciences › Engineering › Biomedical Engineering › Fluid Dynamics and Mixing
  • Physical Sciences › Environmental Science › Water Science and Technology › Minerals Flotation and Separation Techniques
  • Physical Sciences › Engineering › Computational Mechanics › Granular flow and fluidized beds
Keywords
bubble column, bubble size distribution, bubble breakup, bubble coalescence, population balance, Euler-Eulerian two-phase model, large-scale vortices, void fraction, superficial gas velocity

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