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Comprehensive Analysis of the Overall Gas Holdup Profiles in Various Air-Water Bubble Columns.

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Title: Comprehensive Analysis of the Overall Gas Holdup Profiles in Various Air-Water Bubble Columns.
Authors: Nedeltchev, Stoyan1 (AUTHOR) snn13@gmx.net, Mühlbauer, Adam2 (AUTHOR), Ferrario, Andrea3 (AUTHOR), Varallo, Nicolo3 (AUTHOR), Marchini, Sara4 (AUTHOR), Pjontek, Dominic5 (AUTHOR), Hlawitschka, Mark W.2 (AUTHOR), Besagni, Giorgio3,6 (AUTHOR)
Source: Journal of Chemical Engineering of Japan. Dec2025, Vol. 58 Issue 1, p1-21. 21p.
Subjects: Bubble column reactors, Mass transfer, Fluid pressure, Gas-liquid interfaces, Water aeration, Hydrodynamics
Abstract: Bubble columns (BCs) are widely used gas-liquid contactors in the chemical industry. Their hydrodynamic and mass transfer performance depends on the prevailing flow regime (FR) and the gas sparger (GS) type (particularly in the homogeneous FR). In this work, numerous gas holdup profiles measured by means of different techniques in various air-water BCs (with inner diameters between 0.1 and 0.33 m) have been carefully analyzed. A comparative analysis of the power-law dependence of gas holdup on the superficial gas velocity UG has been performed. Eight different GS types have been used. The dependence of the constant C and the exponent n (in the power-law fit) on the GS type in both main FRs has been investigated. The effect of the operating pressure P on these parameters has been studied in a BC equipped with a perforated plate GS with an open area (OA) of 2.25%. The previous knowledge about the exponent n was corrected based on our database of gas holdups. It was shown that in some cases the n value could exceed the limit of 1.2 in the homogeneous FR. On the other hand, in the case of gas maldistribution, the n value could be lower than 1. It was also found that the n value increases with P, which implies that the n value is associated with the behavior of the small bubbles, which predominate at elevated P values. It turn out that in the heterogeneous FR the n value at ambient P was as low as 0.17 and then gradually it increased to 0.44 at P = 3.0 MPa. In the case of heterogeneous BCs equipped with the other GS types and operated at ambient P, the n values varied between 0.11 and 0.73. Such a low n value has not been reported hitherto. [ABSTRACT FROM AUTHOR]
Copyright of Journal of Chemical Engineering of Japan is the property of Taylor & Francis Ltd and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
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  Data: Comprehensive Analysis of the Overall Gas Holdup Profiles in Various Air-Water Bubble Columns.
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  Data: <searchLink fieldCode="AR" term="%22Nedeltchev%2C+Stoyan%22">Nedeltchev, Stoyan</searchLink><relatesTo>1</relatesTo> (AUTHOR)<i> snn13@gmx.net</i><br /><searchLink fieldCode="AR" term="%22Mühlbauer%2C+Adam%22">Mühlbauer, Adam</searchLink><relatesTo>2</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Ferrario%2C+Andrea%22">Ferrario, Andrea</searchLink><relatesTo>3</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Varallo%2C+Nicolo%22">Varallo, Nicolo</searchLink><relatesTo>3</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Marchini%2C+Sara%22">Marchini, Sara</searchLink><relatesTo>4</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Pjontek%2C+Dominic%22">Pjontek, Dominic</searchLink><relatesTo>5</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Hlawitschka%2C+Mark+W%2E%22">Hlawitschka, Mark W.</searchLink><relatesTo>2</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Besagni%2C+Giorgio%22">Besagni, Giorgio</searchLink><relatesTo>3,6</relatesTo> (AUTHOR)
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  Data: <searchLink fieldCode="JN" term="%22Journal+of+Chemical+Engineering+of+Japan%22">Journal of Chemical Engineering of Japan</searchLink>. Dec2025, Vol. 58 Issue 1, p1-21. 21p.
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  Data: <searchLink fieldCode="DE" term="%22Bubble+column+reactors%22">Bubble column reactors</searchLink><br /><searchLink fieldCode="DE" term="%22Mass+transfer%22">Mass transfer</searchLink><br /><searchLink fieldCode="DE" term="%22Fluid+pressure%22">Fluid pressure</searchLink><br /><searchLink fieldCode="DE" term="%22Gas-liquid+interfaces%22">Gas-liquid interfaces</searchLink><br /><searchLink fieldCode="DE" term="%22Water+aeration%22">Water aeration</searchLink><br /><searchLink fieldCode="DE" term="%22Hydrodynamics%22">Hydrodynamics</searchLink>
– Name: Abstract
  Label: Abstract
  Group: Ab
  Data: Bubble columns (BCs) are widely used gas-liquid contactors in the chemical industry. Their hydrodynamic and mass transfer performance depends on the prevailing flow regime (FR) and the gas sparger (GS) type (particularly in the homogeneous FR). In this work, numerous gas holdup profiles measured by means of different techniques in various air-water BCs (with inner diameters between 0.1 and 0.33 m) have been carefully analyzed. A comparative analysis of the power-law dependence of gas holdup on the superficial gas velocity UG has been performed. Eight different GS types have been used. The dependence of the constant C and the exponent n (in the power-law fit) on the GS type in both main FRs has been investigated. The effect of the operating pressure P on these parameters has been studied in a BC equipped with a perforated plate GS with an open area (OA) of 2.25%. The previous knowledge about the exponent n was corrected based on our database of gas holdups. It was shown that in some cases the n value could exceed the limit of 1.2 in the homogeneous FR. On the other hand, in the case of gas maldistribution, the n value could be lower than 1. It was also found that the n value increases with P, which implies that the n value is associated with the behavior of the small bubbles, which predominate at elevated P values. It turn out that in the heterogeneous FR the n value at ambient P was as low as 0.17 and then gradually it increased to 0.44 at P = 3.0 MPa. In the case of heterogeneous BCs equipped with the other GS types and operated at ambient P, the n values varied between 0.11 and 0.73. Such a low n value has not been reported hitherto. [ABSTRACT FROM AUTHOR]
– Name: AbstractSuppliedCopyright
  Label:
  Group: Ab
  Data: <i>Copyright of Journal of Chemical Engineering of Japan is the property of Taylor & Francis Ltd and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.)
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        Value: 10.1080/00219592.2025.2588982
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      – Code: eng
        Text: English
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        PageCount: 21
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      – SubjectFull: Bubble column reactors
        Type: general
      – SubjectFull: Mass transfer
        Type: general
      – SubjectFull: Fluid pressure
        Type: general
      – SubjectFull: Gas-liquid interfaces
        Type: general
      – SubjectFull: Water aeration
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      – SubjectFull: Hydrodynamics
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      – TitleFull: Comprehensive Analysis of the Overall Gas Holdup Profiles in Various Air-Water Bubble Columns.
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              M: 12
              Text: Dec2025
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