On the measurement of bubble size distribution in gas–liquid contactors via light sheet and image analysis

Busciglio, A

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10 Citazioni (Scopus)

Abstract

Particle image velocimetry techniques coupled with advanced image processing tools are receiving an increasing interest for measuring flow quantities and local bubble-size distributions in gas–liquid mechanically agitated vessels. When trying to analyze image information the problem arises that bubble sizes are generally underestimated, due to the fact that the laser sheet used for lighting the system randomly cuts bubbles over non-diametrical planes, leading to an apparent bubble size distribution even in the ideal case of single sized bubbles. Clearly in the case of bubbles with a size distribution the experimental information obtained is affected by the superposition of effects. Aim of this work is that of providing a numerical procedure able to reconstruct actual bubble size distributions from relevant apparent size distributions obtained by laser sheet illumination and image analysis. The procedure proposed is robust and viable and can account for laser sheet thickness. The procedure is shown to provide fully satisfactory results even with quite extreme distributions. BSD resolution dependence on the numerousness of raw data processed is discussed. Use of the proposed procedure for extracting BSD from bubble chord raw data obtained by other devices, such as point probes, is straightforward.
Lingua originaleEnglish
pagine (da-a)2558-2568
Numero di pagine11
RivistaChemical Engineering Science
Volume65
Stato di pubblicazionePublished - 2010

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Bubbles (in fluids)
Image Analysis
Image analysis
Bubble
Gases
Liquid
Liquids
Lasers
Lighting
Laser
Velocity measurement
Image processing
Gas
Numerical Procedure
Chord or secant line
Vessel
Superposition
Illumination
Image Processing
Extremes

All Science Journal Classification (ASJC) codes

  • Chemical Engineering(all)
  • Industrial and Manufacturing Engineering
  • Applied Mathematics
  • Chemistry(all)

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title = "On the measurement of bubble size distribution in gas–liquid contactors via light sheet and image analysis",
abstract = "Particle image velocimetry techniques coupled with advanced image processing tools are receiving an increasing interest for measuring flow quantities and local bubble-size distributions in gas–liquid mechanically agitated vessels. When trying to analyze image information the problem arises that bubble sizes are generally underestimated, due to the fact that the laser sheet used for lighting the system randomly cuts bubbles over non-diametrical planes, leading to an apparent bubble size distribution even in the ideal case of single sized bubbles. Clearly in the case of bubbles with a size distribution the experimental information obtained is affected by the superposition of effects. Aim of this work is that of providing a numerical procedure able to reconstruct actual bubble size distributions from relevant apparent size distributions obtained by laser sheet illumination and image analysis. The procedure proposed is robust and viable and can account for laser sheet thickness. The procedure is shown to provide fully satisfactory results even with quite extreme distributions. BSD resolution dependence on the numerousness of raw data processed is discussed. Use of the proposed procedure for extracting BSD from bubble chord raw data obtained by other devices, such as point probes, is straightforward.",
keywords = "Bubble size distribution; Chord length distribution; Image analysis; PIV; Laser sheet",
author = "{Busciglio, A} and Franco Grisafi and Alberto Brucato and Francesca Scargiali",
year = "2010",
language = "English",
volume = "65",
pages = "2558--2568",
journal = "Chemical Engineering Science",
issn = "0009-2509",
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TY - JOUR

T1 - On the measurement of bubble size distribution in gas–liquid contactors via light sheet and image analysis

AU - Busciglio, A

AU - Grisafi, Franco

AU - Brucato, Alberto

AU - Scargiali, Francesca

PY - 2010

Y1 - 2010

N2 - Particle image velocimetry techniques coupled with advanced image processing tools are receiving an increasing interest for measuring flow quantities and local bubble-size distributions in gas–liquid mechanically agitated vessels. When trying to analyze image information the problem arises that bubble sizes are generally underestimated, due to the fact that the laser sheet used for lighting the system randomly cuts bubbles over non-diametrical planes, leading to an apparent bubble size distribution even in the ideal case of single sized bubbles. Clearly in the case of bubbles with a size distribution the experimental information obtained is affected by the superposition of effects. Aim of this work is that of providing a numerical procedure able to reconstruct actual bubble size distributions from relevant apparent size distributions obtained by laser sheet illumination and image analysis. The procedure proposed is robust and viable and can account for laser sheet thickness. The procedure is shown to provide fully satisfactory results even with quite extreme distributions. BSD resolution dependence on the numerousness of raw data processed is discussed. Use of the proposed procedure for extracting BSD from bubble chord raw data obtained by other devices, such as point probes, is straightforward.

AB - Particle image velocimetry techniques coupled with advanced image processing tools are receiving an increasing interest for measuring flow quantities and local bubble-size distributions in gas–liquid mechanically agitated vessels. When trying to analyze image information the problem arises that bubble sizes are generally underestimated, due to the fact that the laser sheet used for lighting the system randomly cuts bubbles over non-diametrical planes, leading to an apparent bubble size distribution even in the ideal case of single sized bubbles. Clearly in the case of bubbles with a size distribution the experimental information obtained is affected by the superposition of effects. Aim of this work is that of providing a numerical procedure able to reconstruct actual bubble size distributions from relevant apparent size distributions obtained by laser sheet illumination and image analysis. The procedure proposed is robust and viable and can account for laser sheet thickness. The procedure is shown to provide fully satisfactory results even with quite extreme distributions. BSD resolution dependence on the numerousness of raw data processed is discussed. Use of the proposed procedure for extracting BSD from bubble chord raw data obtained by other devices, such as point probes, is straightforward.

KW - Bubble size distribution; Chord length distribution; Image analysis; PIV; Laser sheet

UR - http://hdl.handle.net/10447/57130

M3 - Article

VL - 65

SP - 2558

EP - 2568

JO - Chemical Engineering Science

JF - Chemical Engineering Science

SN - 0009-2509

ER -