Influence of hydrodynamics and probe response on oxygen mass transfer measurements in a high aspect ratio bubble column reactor: Effect of the coalescence behaviour of the liquid phase

Gourich, Bouchaib; Vial, Christophe; Azher, N. El; Soulami, M. Belhaj; Ziyad, M.

doi:10.1016/j.bej.2007.08.011

Cited by 37 publications

(22 citation statements)

References 57 publications

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“…The CSTR model was used to determine k l a. Assuming that the liquid was perfectly mixed and oxygen accumulation in the gas phase was negligible, the mass transfer rate measured by the sensor was given by [41]:…”

Section: Mass Transfermentioning

confidence: 99%

Gas holdup, bubble behavior and mass transfer in a 5m high internal-loop airlift reactor with non-Newtonian fluid

Deng

Wang

Zhang

et al. 2010

Chemical Engineering Journal

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Section: Mass Transfermentioning

confidence: 99%

Gas holdup, bubble behavior and mass transfer in a 5m high internal-loop airlift reactor with non-Newtonian fluid

Deng

Wang

Zhang

et al. 2010

Chemical Engineering Journal

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“…Otherwise, it can bring significant errors in the evaluated results of volumetric mass transfer coefficient [18,19]. Gogate and Pandit [19] analyzed the methods for k L a measurement in bioreactors and concluded that the DPM with the model described in [22] eliminates most of the errors mentioned above and can be used also in large-scale bioreactors [26].…”

Section: Introductionmentioning

confidence: 99%

“…In the "standard dynamic method" (the most commonly used technique) [4,10,11,13,18], the change of oxygen concentration is created by sudden interchange between two inlet gases with different oxygen concentration (in most cases, interchange between nitrogen and air is used) while the gas flow rate is kept unchanged. The drawback of the method lies in the fact that the description of the mixing in the phases can't be simplified by ideal mixing because it can bring significant errors.…”

Section: Introductionmentioning

confidence: 99%

Measurement of Volumetric Mass Transfer Coefficient in Bubble Columns

et al. 2018

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Abstract:The paper presents a brief overview of experiments on volumetric mass transfer coefficient in bubble columns. The available experimental data published are often incomparable due to the different type of gas distributor and different operating conditions used by various authors. Moreover, the value of the coefficient obtained experimentally is very sensitive to the particular method and to the physical models used in its evaluation. It follows that the Dynamic Pressure Method (DPM) is able to provide physically correct values not only in lab-scale contactors but also in pilot-scale reactors. However, the method was not correctly proven in bubble columns. In present experiments, DPM was employed in a laboratory-scale bubble column with a coalescent phase and tested in the pure heterogeneous flow regime. The method was successfully validated by the measurements under two different conditions relevant to the mass transfer. First, the ideal pressure step was compared with the non-ideal pressure step. Second, the pure oxygen absorption was compared with the simultaneous oxygen-and-nitrogen absorption. The obtained results proved that DPM is suitable for measuring the mass transport in bubble columns and to provide reliable data of volumetric mass transfer coefficient.

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“…5 has been widely used in this or equivalent forms in the literature [16,28], when the probe's dynamics cannot be neglected. Consideration of the probe dynamics was necessary since the characteristic time of the mass transfer t f = (k L a) -1 did not meet the criterion t f > 10ζ [16]. An average ζ of 91.5 s was identified as suitable for all the conditions tested.…”

Section: Considerations For the Calculation Of Volumetric Mass Transfmentioning

confidence: 99%

“…Although different fluids have been investigated, the comparison between studies in order to gain a broad understanding of the importance of µ a and rheology on k L a is limited, due to the dependence of k L a on experimental set-up and considerations used for its calculation. Sparger type [15], probe position [16], probe dynamics [16], assumptions for calculation [16] and data truncation [17] can substantially affect k L a. This necessitates the development of studies that address the impact on mass transfer of µ a , rheological behaviour and operational conditions with a single experimental set-up and reported assumptions for calculations.…”

Section: Introductionmentioning

confidence: 99%

Gas to liquid mass transfer in rheologically complex fluids

Fernández

Cartmell

Soares

et al. 2015

Chemical Engineering Journal

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International audienceThe increase of studies relaying on gas to liquid mass transfer in digested sludge (shear thinning fluid) necessitates a better understanding of the impact of apparent viscosity (μa) and rheology in process performance. Mass transfer retardation due to μa variations was investigated in a pilot scale absorption bubble column for Newtonian and shear thinning fluids with varied superficial gas velocities (UG). A non-linear reduction of mass transfer efficiency with increasing μa was observed, being the impact higher at low μa ranges and high UG. An increase of 114 cPo in μ from 1.01 to 115 cPo in glycerol solutions saturated with UG = 1.73 cm s−1 led to a reduction of 96% in kLa (α = 0.04), while a comparable raise from 115 to 229 cPo implied a reduction of 52% (α = 0.02). Slug–annular flow regime was identified for shear thinning fluids of high μa (1.0% and 1.5% carboxymethyl cellulose sodium salt solutions), where bubble buoyancy was conditioned by the μ of the fluid at rest and the active volume for mass transfer was reduced because of the presence of stagnant areas. Conditions imitating the rheological variability of anaerobically digested sewage sludge were included within those tested, being a reduction in gas transfer efficiency of 6 percentage points (from 7.6 ± 0.3% to 1.6 ± 0.1%) recorded when increasing μa from 130 to 340 cPo. It is thus recommended that rheology and μa variability are accounted for within the design of gas to liquid mass transfer systems involving digested sewage sludge, in order to avoid reductions in process performance and active volum

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Influence of hydrodynamics and probe response on oxygen mass transfer measurements in a high aspect ratio bubble column reactor: Effect of the coalescence behaviour of the liquid phase

Cited by 37 publications

References 57 publications

Gas holdup, bubble behavior and mass transfer in a 5m high internal-loop airlift reactor with non-Newtonian fluid

Gas holdup, bubble behavior and mass transfer in a 5m high internal-loop airlift reactor with non-Newtonian fluid

Measurement of Volumetric Mass Transfer Coefficient in Bubble Columns

Gas to liquid mass transfer in rheologically complex fluids

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