Experimental determination of the drag coefficient in a swarm of bubbles

Simonnet, M.; Gentric, Caroline; Olmos, Éric; Midoux, N.

doi:10.1016/j.ces.2006.10.012

Cited by 184 publications

(135 citation statements)

References 27 publications

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“…Generally, the optical probe is considered rather accurate in terms of void fraction. Comparing optical probe results with other measurement techniques (i.e., visual or pressure sensors), the relative differences found in the literature are as follows: between À 0.8% and À 16% (Barrau et al, 1999), À2.2% (Zhang and Zhu, 2013), -3% (Chang et al, 2003), À 11% (Lima Neto et al, 2008), between À6 and À 14% (Kiambi et al, 2003), þ 12% (Simonnet et al, 2007). Barrau et al observed the worst performance with no liquid flow and/or at low gas fractions.…”

Section: Optical Probe Sources Of Errorsmentioning

confidence: 99%

“…Similar optical probe system have been used by different authors (Besagni et al, 2014Inzoli, 2015, 2016a;Chaumat et al, 2005a;Kiambi et al, 2003;Lima Neto et al, 2008;Simonnet et al, 2007;Zhang and Zhu, 2013).…”

Section: Instrumentationmentioning

confidence: 99%

“…The rise time errors are primarily affected by the impact angle of the bubbles with the probe tip. The relative difference reported in the literature, compared with other techniques (i.e., image processing) are þ 45% (Cartellier and Barrau, 1998), þ5% (Kiambi et al, 2003), between þ 5 and þ 6% (Chang et al, 2003), between þ10 and þ30% (Chaumat et al, 2005a), þ15% (Simonnet et al, 2007), and þ 29% (Lima Neto et al, 2008), approximately þ9% (Zhang and Zhu, 2013). Bubble diameter.…”

Section: Optical Probe Sources Of Errorsmentioning

confidence: 99%

“…(13) is based on the assumption of spherical bubbles; however, this assumption is only approximately valid when bubbles are small. The following equation has been used to account for the non-sphericity of bubbles (Simonnet et al, 2007):…”

Section: Instrumentationmentioning

confidence: 99%

“…For example, Akita and Yoshida (1973) (d c ¼0.152 m, H c ¼2.5 m) observed a negligible effect of U L (up to 0.04 m/s) in both co-current and countercurrent operations. At higher liquid velocities, the column operation influences the holdup: the co-current mode reduces the holdup (Biń et al, 2001;Chaumat et al, 2005b;Jin et al, 2007;Kumar et al, 2012;Otake et al, 1981;Pjontek et al, 2014;Shah et al, 2012;Simonnet et al, 2007), and the counter-current mode increases the holdup (Besagni and Inzoli, 2016a;Besagni et al, 2014Biń et al, 2001;Jin et al, 2010;Otake et al, 1981) as bubbles are either accelerated or decelerated by liquid motion (Leonard et al, 2015;Rollbusch et al, 2015a). Baawain et al (2007) showed that the counter-current or cocurrent operation modes influenced the holdup by approximately 5% in weight, and less than 1% in bubble size, showing that the effect observed is mainly caused by the bubble rise velocity and not only the bubble size.…”

Section: Introductionmentioning

confidence: 99%

See 4 more Smart Citations

Comprehensive experimental investigation of counter-current bubble column hydrodynamics: Holdup, flow regime transition, bubble size distributions and local flow properties

Besagni

Inzoli

2016

Chemical Engineering Science

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Section: Optical Probe Sources Of Errorsmentioning

confidence: 99%

Section: Instrumentationmentioning

confidence: 99%

Section: Optical Probe Sources Of Errorsmentioning

confidence: 99%

Section: Instrumentationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Comprehensive experimental investigation of counter-current bubble column hydrodynamics: Holdup, flow regime transition, bubble size distributions and local flow properties

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Active alkaline traps to determine acidic‐gas ratios in volcanic plumes: Sampling techniques and analytical methods

Wittmer

Bobrowski

Liotta

et al. 2014

Geochem Geophys Geosyst

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In situ measurements have been the basis for monitoring volcanic gas emissions for many years and-being complemented by remote sensing techniques-still play an important role to date. Concerning in situ techniques for sampling a dilute plume, an increase in accuracy and a reduction of detection limits are still necessary for most gases (e.g., CO 2 , SO 2 , HCl, HF, HBr, HI). In this work, the Raschig-Tube technique (RT) is modified and utilized for application on volcanic plumes. The theoretical and experimental absorption properties of the RT and the Drechsel bottle (DB) setups are characterized and both are applied simultaneously to the well-established Filter packs technique (FP) in the field (on Stromboli Island and Mount Etna). The comparison points out that FPs are the most practical to apply but the results are errorprone compared to RT and DB, whereas the RT results in up to 13 times higher analyte concentrations than the DB in the same sampling time. An optimization of the analytical procedure, including sample pretreatment and analysis by titration, Ion Chromatography, and Inductively Coupled Plasma Mass Spectrometry, led to a comprehensive data set covering a wide range of compounds. In particular, less abundant species were quantified more accurately and iodine was detected for the first time in Stromboli's plume. Simultaneously applying Multiaxis Differential Optical Absorption Spectroscopy (MAX-DOAS) the chemical transformation of emitted bromide into bromine monoxide (BrO) from Stromboli and Etna was determined to 3-6% and 7%, respectively, within less than 5 min after the gas release from the active vents.

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Evolution of bubble size distribution from gas blowout in shallow water

et al. 2016

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Gas is often emanated from the sea bed during a subsea oil and gas blowout. The size of a gas bubble changes due to gas dissolution in the ambient water and expansion as a result of a decrease in water pressure during the rise. It is important to understand the fate and transport of gas bubbles for the purpose of environmental and safety concerns. In this paper, we used the numerical model, VDROP‐J to simulate gas formation in jet/plume upon release, and dissolution and expansion while bubble rising during a relatively shallow subsea gas blowout. The model predictions were an excellent match to the experimental data. Then a gas dissolution and expansion module was included in the VDROP‐J model to predict the fate and transport of methane bubbles rising due to a blowout through a 0.10 m vertical orifice. The numerical results indicated that gas bubbles would increase the mixing energy in released jets, especially at small distances and large distances from the orifice. This means that models that predict the bubble size distribution (BSD) should account for this additional mixing energy. It was also found that only bubbles of certain sizes would reach the water surfaces; small bubbles dissolve fast in the water column, while the size of the large bubbles decreases. This resulted in a BSD that was bimodal near the orifice, and then became unimodal.

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Experimental determination of the drag coefficient in a swarm of bubbles

Cited by 184 publications

References 27 publications

Comprehensive experimental investigation of counter-current bubble column hydrodynamics: Holdup, flow regime transition, bubble size distributions and local flow properties

Comprehensive experimental investigation of counter-current bubble column hydrodynamics: Holdup, flow regime transition, bubble size distributions and local flow properties

Active alkaline traps to determine acidic‐gas ratios in volcanic plumes: Sampling techniques and analytical methods

Evolution of bubble size distribution from gas blowout in shallow water

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