Analysis of Electrical Resistance Tomography Measurements Obtained on a Bubble Column

Fransolet, Emmanuelle; Crine, Michel; L'Homme, Guy; Toye, Dominique; Marchot, Pierre

doi:10.1002/1522-2640(200106)73:6<754::aid-cite7543333>3.0.co;2-4

Cited by 8 publications

(12 citation statements)

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“…This regime is characterized by poor gas dissolution and high energy consumption. For the synthetic effluent, after the homogeneous regime, we observe a regime transient characterized by an almost flat profile of gas retention in this profile, [12] shows that as the heterogeneous diet the dissolution of air is limited by the presence of large bubbles.…”

Section: Gas Retention εGmentioning

confidence: 84%

“…The first phase which is between [3 -10mL / S] we has a proportional relationship between the superficial gas velocity and gas retention. This linear profile on this portion would translate according to [2,12] a homogeneous regime which is characterized by a dispersion of the gas in the liquid in the form of small bubbles. Note that whatever the experimental conditions, gas retention increases linearly with the flow of air circulation.…”

Section: Gas Retention εGmentioning

confidence: 99%

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<sup>Hydrodynamic Study and Influence of Physicochemical Parameters on Gas Retention in a Submerged Membrane Bioreactor</sup>

Nm¹,

Guillaume²,

Heran³

et al. 2018

Preprint

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Gas-liquid reactors pose transfer difficulties due to diffusion effects. It is necessary to master the aeration and hydrodynamics of the medium to conduct the reaction well and get a good performance. For this purpose, a study in a submerged membrane bioreactor with a useful volume of 30L, consisting of a microfiltration membrane with an average pore size of 0.14 mm having an effective surface area of 0.2 m2 and a PVC cylindrical air diffuser of radius 4 cm has been studied. The saline tracing method associated with a conductimetric follow-up made it possible to determine the residence times and the mixing time in the reactor at 4 different points both in recirculation and in the absence of recirculation. Gas retention was measured by the manometric method. The experiments were carried out at different temperatures of 25 ° C, at 45 ° C, with a variable air flow rate of 0.5 to 16 mL / s and different solutions (osmosis water, ammonium formate solution, solution ammonium formate + salt, synthetic rubber effluent). The results show that the mixing time varies from one point to another and the recirculation of the mixture reduces the mixing time. One of the positions is limiting, the transfer is done most by diffusion with a mixing time of 115 min without circulation and 65 min with circulation. Gas retention increases with aeration rate and temperature. On the other hand, the more the medium becomes rich in organic substances, the more the gaseous retention decreases. The homogeneous fine-bubble regime is obtained for an air flow rate of between 3 and 10 mL / s of aeration. Beyond this flow rate, the regime becomes heterogeneous without a transition phase for ammonium formate and formate ammonium + salt solutions.

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Section: Gas Retention εGmentioning

confidence: 84%

Section: Gas Retention εGmentioning

confidence: 99%

<sup>Hydrodynamic Study and Influence of Physicochemical Parameters on Gas Retention in a Submerged Membrane Bioreactor</sup>

Nm¹,

Guillaume²,

Heran³

et al. 2018

Preprint

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show abstract

“…Measurement of gas hold-up by ERT in a bubble column has been compared with those obtained by pressure transducers and an optical probe, 13 and good agreement was found. The ability of ERT to diagnose the functioning of the sparger in bubble columns was demonstrated by systematically plugging portions of the sparger.…”

Section: Application Of Ert To Bubble Columns and Packed Bedsmentioning

confidence: 88%

An overview of electrical tomographic measurements in pharmaceutical and related application areas

Bolton¹,

Primrose²

2005

AAPS PharmSciTech

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Tomographic measurement techniques offer the opportunity to quantify the degree of homogeneity of particulate suspensions and other multiphase mixtures. Electrical resistance tomography is a relatively simple and inexpensive technique for measuring the distribution of electrical conductivity within multiphase systems. This can provide pertinent information about the physical form, the chemical composition, or the general status of manufacturing. In this contribution, we present recent applications of this technology to processes in pharmaceutical and related application areas. Examples include on-line measurement of solids distribution in stirred tanks and crystallizers, monitoring the performance of an industrial pressure filter, and flow profile and velocity measurements in a physical model of a catalytic reactor.

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“…This means that the liquid holdup measurement reflects direct dependency on the flow rate of gas both for stagnant and fixed liquid flow rate. Moreover, research by Fransolet et al, suggests that liquid level and differential pressure measurement method shows discrepancy under churn flow regime [11]. Unfortunately, the churn flow regime dominates stagnant liquid experiment for ZNLF holdup measurement.…”

Section: Comparison Of Liquid Holdup Data With Existing Datamentioning

confidence: 99%

An Empirical Correlation for Zero-Net Liquid Flow in Gas-Liquid Compact Separator

Kanshio¹

2019

AJCHE

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Compact separators have significant application for subsea separation and offshore application. However, their operating envelope is usually narrow due to physical phenomena such as liquid carryover and gas carry-under. Before the occurrence of liquid carryover, the separator operates in what is termed zero-net liquid flow (ZNLF). Though there is an efficient separation during ZNLF; there is also liquid holdup in the upper section of the separator, which is termed as ZNLF holdup. The ZNLF holdup in a cyclonic separator during an actual gas-liquid separation was studied experimentally. The ZNLF holdup was measured directly using electrical resistance tomography (ERT). The direct measurement approach is an improvement of the existing method, which depends on measuring the pressure drop across the stagnant liquid column. The results showed that increasing gas flow rate at a constant liquid flow rate increase zero-net liquid holdup in the upper part of the separator. An empirical correction was developed, and the correlation predicted the experimental results with a ±10% error margin. The correlation could be useful as part of the input into a pressure drop model for calculating pressure drop across the gas leg of the cylindrical cyclonic separator. This correlation will be useful to process engineers for optimum design and operation of a gas-liquid compact separator.

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Analysis of Electrical Resistance Tomography Measurements Obtained on a Bubble Column

Abstract: U t a L e w i n -K r e t z s c h m a r P e t e r H a r t i n g

Cited by 8 publications

References 0 publications

<sup>Hydrodynamic Study and Influence of Physicochemical Parameters on Gas Retention in a Submerged Membrane Bioreactor</sup>

<sup>Hydrodynamic Study and Influence of Physicochemical Parameters on Gas Retention in a Submerged Membrane Bioreactor</sup>

An overview of electrical tomographic measurements in pharmaceutical and related application areas

An Empirical Correlation for Zero-Net Liquid Flow in Gas-Liquid Compact Separator

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