2019
DOI: 10.1002/ceat.201800726
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Solid Dissolution and Liquid Mixing in Turbulent Stirred Tanks

Abstract: The dissolution of salt particles in turbulent stirred vessels is investigated. A novel method for achieving the simultaneous identification of the liquid mixing time and the dissolution time of salt particles from the conductivity data collected by electrical resistance tomography is presented. The characteristic time of the liquid mixing during the dissolution is found to be either uninfluential or significant on the dissolution itself, depending on the salt particle diameter and the vessel size. The adoptio… Show more

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Cited by 13 publications
(6 citation statements)
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“…These last complexities can only be tackled by resorting to complex CFD-based two-phase simulations, as done by , who employed RANS for the liquid phase and Lagrangian DPM for the particles, as well as by Hartman et al (2006), who resorted to LES and an Eulerian-Lagrangian approach involving particle size distribution as well as particle-particle and particle-walls interactions, so usefully getting extremely detailed information, but clearly at the cost of an extremely high simulation burden and suffering from a substantial lack of experimental evidence for model details validation. As concerns this last aspect, advanced experimental techniques such as Electrical Resistance Tomography (ERT, Carletti et al, 2018;Montante et al, 2019) and Laser Sheet Image Analysis (LSIA, Tamburini et al, 2013;Busciglio et al, 2010) have started being employed for getting local features of the stirred twophase mixtures, including the case of dissolving particles, and may provide the experimental information needed to validate complex CFD models. Apart from these last developments, most of the previously quoted dissolution models adopt a concentrated parameter approach for the interfacial and bulk concentrations as well as for mass transfer coefficient and particle size (i.e.…”
Section: Introductionmentioning
confidence: 99%
“…These last complexities can only be tackled by resorting to complex CFD-based two-phase simulations, as done by , who employed RANS for the liquid phase and Lagrangian DPM for the particles, as well as by Hartman et al (2006), who resorted to LES and an Eulerian-Lagrangian approach involving particle size distribution as well as particle-particle and particle-walls interactions, so usefully getting extremely detailed information, but clearly at the cost of an extremely high simulation burden and suffering from a substantial lack of experimental evidence for model details validation. As concerns this last aspect, advanced experimental techniques such as Electrical Resistance Tomography (ERT, Carletti et al, 2018;Montante et al, 2019) and Laser Sheet Image Analysis (LSIA, Tamburini et al, 2013;Busciglio et al, 2010) have started being employed for getting local features of the stirred twophase mixtures, including the case of dissolving particles, and may provide the experimental information needed to validate complex CFD models. Apart from these last developments, most of the previously quoted dissolution models adopt a concentrated parameter approach for the interfacial and bulk concentrations as well as for mass transfer coefficient and particle size (i.e.…”
Section: Introductionmentioning
confidence: 99%
“…Adria ´n Z ˇa ´k1, * Toma ´s ˇMoucha column reactors [19], stirred tanks [20,21] and in many other multiphase [22][23][24] and single-phase equipment [25].…”
Section: Introductionmentioning
confidence: 99%
“…In this work, the BT is compared with the RT considering the gas holdup distribution and liquid homogenization dynamics obtained by electrical resistance tomography (ERT) in both single‐ and multiple‐impeller configurations. ERT is selected, since it is a non‐intrusive technique suitable for providing both steady state and transient measurement of the mixture conductivity and it has already been successfully applied for the investigation of gas‐liquid equipment, such as bubble columns 18, column reactors 19, stirred tanks 20, 21 and in many other multiphase 22–24 and single‐phase equipment 25.…”
Section: Introductionmentioning
confidence: 99%
“…PIV is adopted to determine the local flow fields ,, from which the local shear rate and the velocity distribution in the volume can be calculated. The homogenization dynamics of a tracer in the system can be followed with the PLIF technique, thus determining the mixing time. The analysis of the feedstock sedimentation can be performed with the ERT technique, simultaneously tracking the feedstock/medium mass transfer and the additives injection dynamics . These advanced and not intrusive measurements may push forward the understanding and the subsequent design and optimization of mechanically stirred digesters.…”
Section: Introductionmentioning
confidence: 99%