Gas-liquid mass transfer in vessels stirred with multiple impellers—I. Gas-liquid mass transfer characteristics in individual stages

Linek, V.; Moucha, T.; Sinkule, J.

doi:10.1016/0009-2509(95)00395-9

Cited by 83 publications

(55 citation statements)

References 19 publications

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“…At the lowest gas rate Pe decreases with N, behavior which is consistent with expectation and confirms previous findings for the Rushton turbines [13,14,16] and A315 impellers [3]. At higher gas rates, Pe is lower at low impeller speed and exhibits limited changes as N increases.…”

Section: Gas Flow Behavior For the Bt-6'ssupporting

confidence: 91%

Gas Flow Behavior in a Two‐Phase Reactor Stirred with Triple Turbines

Majirova¹,

Pinelli²,

Machoň³

et al. 2004

Chem Eng & Technol

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Gas behavior was studied in a gas-liquid reactor stirred with multiple turbines. Triple PBTs pumping either down or up and BT-6's were used. The behavior of coalescing (water) and non-coalescing (sodium sulfate solution) systems was investigated. The gas phase behavior was characterized by means of the RTD and modeled with the axial dispersion model. This model was confirmed to interpret the experimental data well for water and satisfactorily for the coalescence-inhibiting solutions. The influence of the operating conditions, turbine type and system coalescing behavior on the model parameters is discussed. Comparison is also made with similar data regarding Rushton turbines and high-solidity ratio hydrofoils, as well as gas holdup.

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Section: Gas Flow Behavior For the Bt-6'ssupporting

confidence: 91%

Gas Flow Behavior in a Two‐Phase Reactor Stirred with Triple Turbines

Majirova¹,

Pinelli²,

Machoň³

et al. 2004

Chem Eng & Technol

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“…Thus, it was more effective to operate in the loaded and complete dispersion regime. These experiences confirm and explain the unbalanced mass transfer performance observed by Linek et al [ 42,43] and Gagnon et al [31] in multiple impeller systems and by Bellgardt [33], Moilanen et al [44] , and Stenberg and Andersson [34,35] in single impeller systems.…”

Section: Figure 2: Effects Of Multiple Impellers On Gas-liquid Mass Tsupporting

confidence: 83%

Mixing Considerations in Stirred Tank Bioreactors When Using Fluid Property Altering Microorganisms

Kadic

Heindel

2010

ASME 2010 3rd Joint US-European Fluids Engineering Summer Meeting: Volume 1, Symposia – Parts A, B, and C

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Stirred tank reactors are one of the standard reactors in the chemical industry and have been widely implemented for biological applications. They are used with viscous liquids, slurries, very low gas flow rates, and large liquid volumes. Stirred tank bioreactors are popular because a well-mixed state, required or preferred for numerous biological processes, is usually achieved in such situations; however, many production processes using microorganisms tend to experience fluid property alterations, which significantly impact mixing, operational parameters, and process results. The most troubling issues occur when a fluid gradually undergoes a viscosity change and/or slowly exhibits non-Newtonian behavior due to microorganism growth since these will alter the flow conditions and possibly limit the conversion rate or production scale. This paper provides an overview of the relevant mixing issues in stirred tank bioreactors when using a range of fluid viscosities, surface tensions, and/or non-Newtonian fluids. ABSTRACT Stirred tank reactors are one of the standard reactors in the chemical industry and have been widely implemented for biological applications. They are used with viscous liquids, lurries, very low gas flow rates, and large liquid vo lumes. tirred tank bioreactors are popular because a well-mixed state, required or prefetTed for numerous biological processes, is usually achieved in such situations; however, many production processes using microorganisms tend to experience fluid property alterations, which significantly impact mixing, operational parameters, and process results. The most troubling i ues occur when a fluid gradually undergoes a viscosity change and/or slowly exhibits non-Newtonian behavior due to microorganism growth since these will alter the flow conditions and possibly limit the conversion rate or production sca le. This paper provides an overview of the relevant mixing issues in tirred tank bioreactors when using a range of fluid viscosities, urface tensions, and/or non-Newtonian fluids .

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“…It is worth to notice that values of the k L a coefficient can be depended on the measurement method used (Kiełbus-Rąpała & Karcz, 2009). Although a number of techniques were developed to measure the k L a values, the unsteady-state gassing-out dynamic methods ( Van't Riet, 1979;Linek et al, 1982;Linek et al, 1987;Linek et al, 1996;Ozkan et al, 2000;Lu et al, 2002, Garcia-Ochoa & Gomez, 2009) are preferably used as they are fast, experimentally simple and applicable in various systems. These methods are used in many variants.…”

Section: Survey Of the Results For Gas-liquid Systemmentioning

confidence: 99%