Gas–liquid mass transfer in a new three‐phase stirred airlift reactor

Wang, Bang; Nikov, Iordan; Delmas, Hami; Bascoul, A.

doi:10.1002/(sici)1097-4660(199806)72:2<137::aid-jctb887>3.3.co;2-5

Cited by 6 publications

(9 citation statements)

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“…The power number for each impeller was calculated using the equation given by

N_{P} = \frac{P_{0}}{ρ_{normalL} N^{3} d_{i}^{5}}

where P 0 is the power drawn under ungassed conditions, and N is the stirring speed. The power is related is related to the imposed torque ( M ) on the rotating shaft, by the relationship

P_{0} = 2 π N (M - M_{0})

where M 0 is subtracted to account for power losses in the motor, gearbox, bearings, and seals.…”

Section: Methodsmentioning

confidence: 99%

“…The effective interfacial area and the low homogenization of the cell culture decrease because of the high viscosity that the medium produces, which may be insufficient when used at a preindustrial or industrial scale. The low mixing efficiency also limits the homogenization of the medium and the oxygen transfer . In industry, the stirred tank reactor is often preferred for aerobic fermentation when high oxygen transfer rates are required.…”

Section: Introductionmentioning

confidence: 99%

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Influence of impeller type on hydrodynamics and gas‐liquid mass‐transfer in stirred airlift bioreactor

et al. 2015

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The influence of impeller type in a mechanically stirred airlift bioreactor was analyzed in relation to the non‐Newtonian viscous fluids. The agitation was carried out through a marine impeller (axial impeller) and a paddle impeller (radial impeller) located along with the gas sparger in the region comprised by the riser. The bioreactor was sparged with air under different velocities (0.036–0.060 m s−1). Carboxymethylcellulose 1.94% and xanthan 1.80% were used as a fluid model. The gas holdup and volumetric mass‐transfer coefficient increased in up to five and three times, respectively, when compared to a conventional airlift bioreactor; however, better results were obtained when the straight paddle impeller type was used. The results suggest that the studied bioreactor can be used successfully in viscous fluid, and it can be more efficient than conventional airlift bioreactors. The results obtained suggest the use of radial impellers. © 2015 American Institute of Chemical Engineers AIChE J, 61: 3159–3171, 2015

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“…The power number for each impeller was calculated using the equation given by

N_{P} = \frac{P_{0}}{ρ_{normalL} N^{3} d_{i}^{5}}

where P 0 is the power drawn under ungassed conditions, and N is the stirring speed. The power is related is related to the imposed torque ( M ) on the rotating shaft, by the relationship

P_{0} = 2 π N (M - M_{0})

where M 0 is subtracted to account for power losses in the motor, gearbox, bearings, and seals.…”

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Influence of impeller type on hydrodynamics and gas‐liquid mass‐transfer in stirred airlift bioreactor

et al. 2015

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“…Nous reportons ici, quelques resultats relatifs au transfert de matiere : l'objectif etant d'identifier l'influence de l'agitateur A la fois sur les caracteristiques hydrodynamiques et sur le transfert de matiere. Les resultats detailles portant sur le transfert de matiere sont presentes par ailleurs (Bang et al, 1998).…”

Section: Etude Du Transfert De Matiereunclassified

“…augmente. Mais quand la concentration en particules s'accroit, celles-ci peuvent &re enfermees entre deux bulles qui se rapprochent ; elles favorisent alors la coalescence des bulles en aidant la rupture du film, et reduisent ainsi l'aire interfaciale globale 'a' dam le reacteur, et donc k,a (Bang et al, 1998).…”

Section: Reacteur Sans Agitation Mecaniqueunclassified

Effet d'un agitateur mécanique sur l'hydrodynamique et le transfert de matière gaz—liquide en réacteur gazosiphon

Bang

Duquenne²,

Delmas

et al. 1999

Can J Chem Eng

Self Cite

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Cette etude expkrimentale dkrit I'effet d'un agitateur sur l'hydrodynamique et le transfert de matiere a l'interieur d'un contacteur airlift a boucle interne. La contribution des deux elements moteurs (gaz et agitateur) est identifiee. Suivant les conditions de fonctionnement, ou bien ces deux effets s'ajoutent et favorisent la circulation du liquide ou bien ces effets sont opposes, la vitesse du liquide est alors reduite. Par contre, en ce qui concerne le transfert gaz-liquide, I'utilisation de I'agitateur est benefique puisque, pour certaines conditions operatoires, le coefficient de transfert est multiplie par 4 par rapport a celui obtenu sans agitation.L'analyse des diverses contributions energetiques dans I'appareil montre que la presence de I'agitateur est justifiee uniquement dans les cas ou le debit de gaz doit rester faible.

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“…Only Bang et al [8] describe investigations concerning the three-phase airlift reactor with mechanical mixing in the riser. Stirring, in addition to classical airlift, leads to an important increase of the volume mass transfer coefficient.…”

Section: Introductionmentioning

confidence: 99%

Interrelation among Liquid Velocity, Impeller Speed and Gas Flow Rate in the Stirred Airlift Reactor

Kawalec-Pietrenko¹,

Cisiak

2001

Chem. Eng. Technol.

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Gas–liquid mass transfer in a new three‐phase stirred airlift reactor

Cited by 6 publications

References 0 publications

Influence of impeller type on hydrodynamics and gas‐liquid mass‐transfer in stirred airlift bioreactor

Influence of impeller type on hydrodynamics and gas‐liquid mass‐transfer in stirred airlift bioreactor

Effet d'un agitateur mécanique sur l'hydrodynamique et le transfert de matière gaz—liquide en réacteur gazosiphon

Interrelation among Liquid Velocity, Impeller Speed and Gas Flow Rate in the Stirred Airlift Reactor

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