Gas hold-up distribution and mixing time in gas–liquid stirred tanks

Montante, Giuseppina Maria Rosa; Paglianti, Alessandro

doi:10.1016/j.cej.2015.05.058

Cited by 59 publications

(40 citation statements)

References 46 publications

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“…The ERT measurements were performed with the same ITS P2000 instrumentation (Industrial Tomography Systems Ltd.) already adopted for the investigation of gas‐liquid [ 20 ] and solid‐liquid stirred vessels. [ 21 ] Using the ERT technique, the local conductivity on single or multiple cross sections of the equipment is obtained by the reconstruction of the voltage difference measurements.…”

Section: Methodsmentioning

confidence: 99%

Applicability of electrical resistance tomography to the analysis of fluid distribution in haemodialysis modules

2020

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This work aims to explore the applicability of electrical resistance tomography (ERT) in the analysis of fluid distribution in haemodialysis modules, which is not straightforward due to the complex geometry of the hollow fibre bundles and the small sizes of the modules. On the other hand, ERT is potentially a suitable and convenient technique for investigation in this field due to its cost‐effectiveness and capacity to perform measurements in opaque systems. After a preliminary estimation of the fibre bundle local distribution, the assessment of the technique is performed by observing the time evolution of the measured conductivity maps during the module filling and emptying operations with water and air, which are alternatively fed inside or outside the fibre bundle. Reliable conductivity maps are obtained by placing the module vertically or horizontally. Additional experimental data collected by feeding liquid mixtures of different sodium chloride concentrations show that the technique is suitable for detecting concentration variations, due to the mass transfer through the fibres, and flow maldistribution, due to the specific geometry of the module. From the preliminary results collected in this work, the technique appears to be adequate for the collection of data that can support the optimization of the module geometry and computational model validation.

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Section: Methodsmentioning

confidence: 99%

Applicability of electrical resistance tomography to the analysis of fluid distribution in haemodialysis modules

2020

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“…where σ c is the conductivity of the continuous phase and σ m is the conductivity of the biphasic mixture. An alternative approach was proposed by Montante and Paglianti 49 and applied extensively by Jamshed et al, 50 which used a dimensionless conductivity ε (ε = 100…”

Section: Ert For Gas Hold-upmentioning

confidence: 99%

Measuring gas hold‐up in gas–liquid/gas–solid–liquid stirred tanks with an electrical resistance tomography linear probe

et al. 2019

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An electrical resistance tomography (ERT) linear probe was used to measure gas holdup in a two-phase (gas-liquid) and three phase (gas-solid-liquid) stirred-tank system equipped with a Rushton turbine. The ERT linear probe was chosen rather than the more commonly used ring cage geometry to achieve higher resolution in the axial direction as well as its potential for use on manufacturing plant. Gas-phase distribution was measured as a function of flow regime by varying both impeller speed and gas flow rate. Global and local gas holdup values were calculated using ERT data by applying Maxwell's equation for conduction through heterogeneous media. The results were compared with correlations, hard-field tomography data, and computational fluid dynamic simulations available in the literature, showing good agreement. This study thus demonstrates the capability of ERT using a linear probe to offer, besides qualitative tomographic images, reliable quantitative data regarding phase distribution in gas-liquid systems.

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“…For higher gas flow rates, Montante and Paglianti compared a 6‐SBDT, an axial down‐pumping Lightnin A310 (A310) and an up‐pumping 6‐pitched blade turbine (6‐PBU). The measured properties were the local gas holdup, the flow regime and the mixing time.…”

Section: Impellers Used In Cultivation Systemsmentioning

confidence: 99%

“…Although not discussed in literature yet for single up‐pumping impellers in this way, in aerated stirred tanks independent of the gas flow rate this mode leads to a higher number of bubbles passing through the region between the blades and close by the impeller itself. This results in smaller bubbles, in combination with a flow field allowing the more homogeneous distribution of these smaller bubbles in the tank as Montante and Paglianti indicated, especially for the region above the impeller. Although Bliatsiou et al investigated a non‐aerated liquid‐liquid system, their results for droplet sizes found for an up‐pumping impeller (up‐pumping bionic loop impeller; BiLOOP) in comparison to diverse other common impeller geometries underline this assumption.…”

Section: Impellers Used In Cultivation Systemsmentioning

confidence: 99%

Multiphase Stirred Tank Bioreactors – New Geometrical Concepts and Scale‐up Approaches

Böhm

Hohl

Bliatsiou

et al. 2019

Chemie Ingenieur Technik

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Mainly with respect to biotechnological cases, current developments in the field of impeller geometries and findings for multistage configurations with a specific view on aerated stirred tanks are reviewed. Although often the first choice, in the given case the 6‐straight blade disc turbine is usually not the best option. Furthermore, quantities usable for scale‐up, specifically applicable in this field are discussed. Only quantities taking local conditions into account appear to be able to actually compare different stirrer types and scales.

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Gas hold-up distribution and mixing time in gas–liquid stirred tanks

Cited by 59 publications

References 46 publications

Applicability of electrical resistance tomography to the analysis of fluid distribution in haemodialysis modules

Applicability of electrical resistance tomography to the analysis of fluid distribution in haemodialysis modules

Measuring gas hold‐up in gas–liquid/gas–solid–liquid stirred tanks with an electrical resistance tomography linear probe

Multiphase Stirred Tank Bioreactors – New Geometrical Concepts and Scale‐up Approaches

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