Analysis of immiscible liquid-liquid mixing in stirred tanks by Electrical Resistance Tomography

Maluta, Francesco; Montante, Giuseppina Maria Rosa; Paglianti, Alessandro

doi:10.1016/j.ces.2020.115898

Cited by 31 publications

(17 citation statements)

References 50 publications

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“…This is why the mixing index analysis is performed using Equation (1) presented in the material and method section. The analysis performed by Maluta et al [26] identified a threshold of MI tot to achieve the completely dispersed condition equal to about 0.1.…”

Section: Results In the Liquid-liquid Systemmentioning

confidence: 99%

“…In all cases, the reference measurement for the conductivity field reconstruction was obtained with the vessel filled with water, since, based on previous results [26] in this way, a physically consistent representation of the two-phase system can be obtained, provided that the electrodes are not immersed and far enough from any layer of nonconductive phase.…”

Section: Steady State Measurementsmentioning

confidence: 99%

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Large blade impeller application for turbulent liquid–liquid and solid–liquid mixing

et al. 2022

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Application of large blade impellers to turbulent single-phase and two-phase mixing is investigated in this work in order to provide a quantitative basis for estimating the possible advantages in industrial mixing operations with respect to fast impeller types. The analysis is based on the discussion of threedimensional velocity fields collected in a single-phase vessel stirred by a Maxblend impeller by stereoscopic particle image velocimetry and of dispersed phase distribution and liquid mixing time obtained in solid-liquid and liquidliquid systems by electrical resistance tomography. The results highlight that turbulent two-phase mixing can be efficiently performed in baffled vessels stirred by large blade impellers both in shear-rate controlled and bulk-motion controlled processes.

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Section: Results In the Liquid-liquid Systemmentioning

confidence: 99%

Section: Steady State Measurementsmentioning

confidence: 99%

Large blade impeller application for turbulent liquid–liquid and solid–liquid mixing

et al. 2022

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“…The system studied in this work was a stirred tank previously employed in liquid-liquid investigations [17,18]; it consists of a cylindrical, flat-bottom, fully baffled tank with both its diameter T 1) and its height equal to 0.23 m. The agitation was provided by a Rushton turbine with a diameter equal to T/3, mounted on a central shaft with an off-bottom clearance equal to T/2. The total volume of the mixture was equal to 9.8 L.…”

Section: Experimental Campaignmentioning

confidence: 99%

Numerical and Experimental Analysis of the Daughter Distribution in Liquid‐Liquid Stirred Tanks

et al. 2021

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The drop size distributions (DSDs) of a dilute immiscible liquid-liquid mixture were measured in a fully turbulent stirred tank operating at different impeller speeds. The results were used to infer the best daughter distribution function (DDF) leading to the best reproduction of the shape of the DSD. Bell-shaped, U-shaped, M-shaped, and uniform statistical DDFs were studied, producing from two to four daughters from each breakup event. A simplified approach from the literature was adopted to solve the population balance equation that considers the spectrum of the turbulence inside the tank obtained from computational fluid dynamics simulations. The U-shaped distribution producing four fragments better reproduces the shape of the experimental DSD in the studied system.

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“…The fast growth of ERT is mostly due to the economic aspects, the relative simplicity of implementation, and the potential for sub-millisecond temporal resolution [16]. On the other hand, among the main disadvantages is the data acquisition rate, which affects the image reconstruction time; noise generation is highly correlated to measurement speed, therefore, undesirably impacting the image quality [17]. Furthermore, the inherent nonlinearity of both the conductivity measurement and the inverse algorithms limits the spatial resolution of the electrical tomography technique to approximately 2-5% of the reactor diameter [13,16].…”

Section: Introductionmentioning

confidence: 99%

Real-Time Fault Detection and Diagnosis of CaCO3 Reactive Crystallization Process by Electrical Resistance Tomography Measurements

Aghajanian

Rao

Ruuskanen

et al. 2021

Sensors

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In the present research work, an electrical resistance tomography (ERT) system is utilized as a means for real-time fault detection and diagnosis (FDD) during a reactive crystallization process. The calcium carbonate crystallization is part of the carbon capture and utilization scheme where process monitoring and malfunction diagnostics strategies are presented. The graphical logic representation of the fault tree analysis methodology is used to develop the system failure states. The measurement consistency due to the use of a single electrode from a set of ERT electrodes for malfunction identification is experimentally and quantitatively investigated based on the sensor sensitivity and standard deviation criteria. Electrical current measurements are employed to develop a LabVIEW-based process automation program by using the process-specific knowledge and historical process data. Averaged electrical current is correlated to the mechanical failure of the stirrer through standard deviation evaluation, and slopes of the measured data are used to monitor the pump and concentrations status. The performance of the implemented methodology for detecting the induced faults and abnormalities is tested at different operating conditions, and a basic signal-based alarming technique is developed.

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Analysis of immiscible liquid-liquid mixing in stirred tanks by Electrical Resistance Tomography

Cited by 31 publications

References 50 publications

Large blade impeller application for turbulent liquid–liquid and solid–liquid mixing

Large blade impeller application for turbulent liquid–liquid and solid–liquid mixing

Numerical and Experimental Analysis of the Daughter Distribution in Liquid‐Liquid Stirred Tanks

Real-Time Fault Detection and Diagnosis of CaCO3 Reactive Crystallization Process by Electrical Resistance Tomography Measurements

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